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p53 peptide vaccine
A peptide-based cancer vaccine composed of amino acids 264 to 272 of the wild-type protein encoded by the P53 gene. p53 peptide vaccine may elicit an HLA-A2.1-restricted cytotoxic T lymphocyte immune response against tumor cells that overexpress p53 protein. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

paclitaxel
A compound extracted from the Pacific yew tree Taxus brevifolia with antineoplastic activity. Paclitaxel binds to tubulin and inhibits the disassembly of microtubules, thereby resulting in the inhibition of cell division. This agent also induces apoptosis by binding to and blocking the function of the apoptosis inhibitor protein Bcl-2 (B-cell Leukemia 2). Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

paclitaxel albumin-stabilized nanoparticle formulation
A Cremophor ELP-free, albumin-stabilized nanoparticle formulation of the natural taxane paclitaxel with antineoplastic activity. Paclitaxel binds to and stabilizes microtubules, preventing their depolymerization and so inhibiting cellular motility, mitosis, and replication. This formulation solubilizes paclitaxel without the use of Cremophor ELP and permits the administration of larger doses of this agent, which would be toxic in a Cremophor ELP-containing formulation due to Cremophor ELP's toxicity profile. Cremophor ELP is a nonionic solubilizer made by reacting castor oil with ethylene oxide in a molar ratio of 1:35, followed by a purification step. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

paclitaxel poliglumex
The agent paclitaxel linked to a biodegradable, water-soluble polyglutamate polymer with antineoplastic properties. The polyglutamate residue increases the water solubility of paclitaxel and allows delivery of higher doses than those achievable with paclitaxel alone. Paclitaxel promotes microtubule assembly and prevents microtubule depolymerization, thus interfering with normal mitosis. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

paclitaxel vitamin E-based emulsion formulation
A cremophor-free, P-glycoprotein-inhibiting, vitamin E-based emulsion particle formulation of paclitaxel with antineoplastic activity. Paclitaxel binds to tubulin and inhibits the disassembly of microtubules, thereby resulting in the inhibition of cell division. This agent also induces apoptosis by binding to and blocking the function of the apoptosis inhibitor protein Bcl-2 (B-cell Leukemia 2). The vitamin-E based emulsion allows bolus infusion without steroid premedication and may diminish hypersensitivity reactions; tumor tissue may be passively targeted due to preferential deposition of emulsion particles while an emulsion formulation component inhibits the P-glycoprotein drug efflux pump. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

paclitaxel-loaded polymeric micelle
A biodegradable poly(ethylene glycol)-poly(D,L-lactide) copolymer miceller nanoparticle-entrapped formulation of paclitaxel with antineoplastic activity. Paclitaxel promotes microtubule assembly and prevents depolymerization, thus interfering with normal mitosis. The copolymer residue increases the water-solubility of paclitaxel and allows delivery of higher doses than those achievable with paclitaxel alone. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

PADRE 965.10
Pan-DR epitope (PADRE) 965.10 is a helper peptide. PADRE peptides have been shown the capacity to deliver help for antibody responses in vivo. They were also found to be able to provide significant helper T-cell activity in vivo. Acts as an adjuvant. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Palestrol
(Other name for: diethylstilbestrol)

palifermin
A recombinant form of the endogenous human keratinocyte growth factor. Palifermin binds to epithelial cell surface receptors in the lining of the mouth and gastrointestinal tract, resulting in stimulation of epithelial cell proliferation, differentiation and upregulation of cytoprotective mechanisms. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Pallace
(Other name for: megestrol acetate)

palladium Pd 103
A radioisotope of the metal palladium used in brachytherapy implants or 'seed'. With a half-life of 17 days, palladium 103 administered with brachytherapy allows continuous, tumor-site specific low-energy irradiation to the tumor cell population while sparing normal adjacent tissues from radiotoxicity. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

palladium-bacteriopheophorbide
A novel palladium-substituted bacteriochlorophyll derivative and photosensitizer with potential antitumor activity. Upon administration, inactive palladium-bacteriophephorbide is activated locally when the tumor bed is exposed to photoirradiation; the activated form induces local cytotoxic processes, resulting in local tissue damage, disruption of tumor vasculature, and tumor hypoxia and necrosis. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

palonosetron hydrochloride
The hydrochloride salt of palonosetron, a carbazole derivative and a selective serotonin receptor antagonist with antiemetic activity. Palonosetron competitively blocks the action of serotonin at 5-hydroxytryptamine type 3 (5-HT3) receptors located on vagal afferents in the chemoreceptor trigger zone (CTZ), resulting in suppression of chemotherapy-induced nausea and vomiting. The CTZ is located in the area postrema on the dorsal surface of the medulla oblongata at the caudal end of the fourth ventricle and outside the blood-brain barrier (BBB). Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

pamidronate disodium
The disodium salt of the synthetic bisphosphonate pamidronate. Although its mechanism of action is not completely understood, pamidronate appears to adsorb to calcium phosphate crystals in bone, blocking their dissolution by inhibiting osteoclast-mediated bone resorption. This agent does not inhibit bone mineralization and formation. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

pan HER/VEGFR2 receptor tyrosine kinase inhibitor BMS-690154
A pyrrolotriazine-based compound and a pan inhibitor of receptor tyrosine kinases with potential antineoplastic activity. Pan HER/VEGFR2 receptor tyrosine kinase inhibitor BMS-690154 binds to human epidermal growth factor receptors 1 and 2 (HER1, HER2) and vascular endothelial growth factor receptor 2 (VEGFR-2), all three of which are frequently overexpressed by a variety of tumor types. Binding of this agent to these receptors may result in the inhibition of tumor cell proliferation; the inhibition of endothelial cell migration and proliferation and angiogenesis; and tumor cell death. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

pan-AKT kinase inhibitor GSK690693
An aminofurazan-derived inhibitor of Akt kinases with potential antineoplastic activity. Pan-AKT kinase inhibitor GSK-690693 binds to and inhibits Akt kinases 1, 2, and 3, which may result in the inhibition of protein phosporylation events downstream from Akt kinases in the PI3K/Akt signaling pathway, and, subsequently, the inhibition of tumor cell proliferation and the induction of tumor cell apoptosis. In addition, this agent may inhibit other protein kinases including protein kinase C (PKC) and protein kinase A (PKA). As serine/threonine protein kinases which are involved in a number of biological processes, AKT kinases promote cell survival by inhibiting apoptosis and are required for glucose transport. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Panglobulin
(Other name for: therapeutic immune globulin)

Panhematin
(Other name for: therapeutic hemin)

panitumumab
A human monoclonal antibody produced in transgenic mice that attaches to the transmembrane epidermal growth factor (EGF) receptor. Panitumumab may inhibit autocrine EGF stimulation of tumor cells that express the EGF receptor, thereby inhibiting tumor cell proliferation. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

panobinostat
A cinnamic hydroxamic acid analogue with potential antineoplastic activity. Panobinostat selectively inhibits histone deacetylase (HDAC), inducing hyperacetylation of core histone proteins, which may result in modulation of cell cycle protein expression, cell cycle arrest in the G2/M phase and apoptosis. In addition, this agent appears to modulate the expression of angiogenesis-related genes, such as hypoxia-inducible factor-1alpha (HIF-1a) and vascular endothelial growth factor (VEGF), thus impairing endothelial cell chemotaxis and invasion. HDAC is an enzyme that deacetylates chromatin histone proteins. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Panretin
(Other name for: alitretinoin)

PANVAC-F
(Other name for: falimarev)

PANVAC-V
(Other name for: inalimarev)

Panwarfin
(Other name for: warfarin)

Panzem
(Other name for: 2-methoxyestradiol)

papaverine
An opiate alkaloid isolated from the plant Papaver somniferum and produced synthetically. As a direct-acting smooth muscle relaxant, papaverine is not closely related to the other opium alkaloids in structure or pharmacological actions; its mechanism of action may involve the non-selective inhibition of phosphodiesterases and direct inhibition of calcium channels. This agent also exhibits antiviral activity against respiratory syncytial virus, cytomegalovirus, and HIV. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Paraflex
(Other name for: chlorzoxazone)

Paraplatin
(Other name for: carboplatin)

parathyroid hormone-related protein (1-36)
A recombinant form of a mature, N-terminal secretory peptide derived from a parathyroid hormone-related protein (PTHrP) preprohormone through posttranslational endoproteolytic processing with vasodilating, myorelaxant, and parathyroid hormone (PTH)-like calciotropic activities. Expressed throughout the cardiovascular system, parathyroid hormone-related protein (1-36) [PTHrP (1-36)] was first identified as the PTH-like hypercalcemic factor of humoral hypercalcemia of malignancy; however, its sequence differs significantly from that of PTH (1-34) although both proteins share the same N-terminal end which accounts for the calciotropic activity. Both PTHrP (1-36) and PTH (1-34) bind to the type 1 parathyroid hormone receptor (PTH1R), a specific seven-transmembrane-helix-containing G protein-coupled receptor mainly located in bone and kidney cells. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

paricalcitol
A synthetic noncalcemic, nonphosphatemic vitamin D analogue. Paricalcitol binds to the vitamin D receptor and has been shown to reduce parathyroid hormone (PTH) levels. This agent also increases the expression of PTEN ('Phosphatase and Tensin homolog deleted on chromosome Ten'), a tumor-suppressor gene, in leukemic cells and cyclin-dependent kinase inhibitors, resulting in tumor cell apoptosis and tumor cell differentiation into normal phenotypes. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Parlodel
(Other name for: bromocriptine mesylate)

paroxetine hydrochloride
The hydrochloride salt form of paroxetine, a phenylpiperidine derivative and a selective serotonin reuptake inhibitor (SSRI) with antidepressant and anxiolytic properties. Paroxetine binds to the pre-synaptic serotonin transporter complex resulting in negative allosteric modulation of the complex thereby blocking reuptake of serotonin by the pre-synaptic transporter. Inhibition of serotonin recycling enhances serotonergic function through serotonin accumulation in the synaptic cleft, resulting in long-term desensitization and downregulation of 5HT1 (serotonin) receptors and leading to symptomatic relief of depressive illness. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

PARP inhibitor AZD2281
A small molecule inhibitor of the nuclear enzyme poly(ADP-ribose) polymerase (PARP) with potential chemosensitizing, radiosensitizing, and antineoplastic activities. PARP inhibitor AZD2281 selectively binds to and inhibits PARP, inhibiting PARP-mediated repair of single strand DNA breaks; PARP inhibition may enhance the cytotoxicity of DNA-damaging agents and may reverse tumor cell chemoresistance and radioresistance. PARP catalyzes post-translational ADP-ribosylation of nuclear proteins and can be activated by single-stranded DNA breaks. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

pasireotide
A synthetic long-acting cyclic peptide with somatostatin-like activity. Pasireotide activates a broad spectrum of somatostatin receptors, exhbiting a much higher binding affinity for somatostatin receptors 1, 3, and 5 than octreotide in vitro, as well as a comparable binding affinity for somatostatin receptor 2. This agent is more potent than somatostatin in inhibiting the release of human growth hormone (HGH), glucagon, and insulin. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

patient-specific follicular lymphoma-derived anti-idiotype vaccine
A patient-specific cancer vaccine directed against the soluble protein idiotype of an individual follicular lymphoma with potential antineoplastic activity. A patient-specific follicular lymphoma-derived anti-idiotype vaccine may be composed of a patient-specific, synthetic idiotype-related peptide (such as one corresponding to a hypervariable region of an IgG heavy chain) conjugated to the immunostimulant carrier protein keyhole limpet hemocyanin (KLH). Upon administration, this vaccine may induce an idiotype-specific cytotoxic T-lymphocyte (CTL) response against follicular lymphoma cells expressing the idiotype, resulting in tumor cell lysis. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Pavatym
(Other name for: papaverine)

Paxil
(Other name for: paroxetine hydrochloride)

pazopanib hydrochloride
The hydrochloride salt of a small molecule inhibitor of multiple protein tyrosine kinases with potential antineoplastic activity. Pazopanib selectively inhibits vascular endothelial growth factor receptors (VEGFR)-1, -2 and -3, c-kit and platelet derived growth factor receptor (PDGF-R), which may result in inhibition of angiogenesis in tumors in which these receptors are upregulated. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

PD-0332991
An orally available pyridopyrimidine-derived cyclin-dependent kinase (CDK) inhibitor with potential antineoplastic activity. PD-0332991 selectively inhibits cyclin-dependent kinases (particularly Cdk4/cyclin D1 kinase), which may inhibit retinoblastoma (Rb) protein phosphorylation; inhibition of Rb phosphorylation prevents Rb-positive tumor cells from entering the S phase of the cell cycle (arrest in the G1 phase), resulting in suppression of DNA replication and decreased tumor cell proliferation. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

PD0325901
An orally bioavailable, synthetic organic molecule targeting mitogen-activated protein kinase kinase (MAPK/ERK kinase or MEK) with potential antineoplastic activity. MEK inhibitor PD325901, a derivative of MEK inhibitor CI-1040, selectively binds to and inhibits MEK, which may result in the inhibition of the phosphorylation and activation of MAPK/ERK and the inhibition of tumor cell proliferation. The dual specific threonine/tyrosine kinase MEK is a key component of the RAS/RAF/MEK/ERK signaling pathway that is frequently activated in human tumors. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

PDGFR inhibitor CP-868596
An orally bioavailable small molecule, targeting the platelet-derived growth factor receptor (PDGFR), with potential antineoplastic activity. PDGFR inhibitor CP-868596 binds to and inhibits PDGFR, which may result in the inhibition of PDGFR-related signal transduction pathways, and, so, the inhibition of tumor angiogenesis and tumor cell proliferation. PDGFR, up-regulated in many tumor cell types, is a receptor tyrosine kinase essential to cell migration and the development of the microvasculature. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Pedi-Vit-A
(Other name for: vitamin A compound)

PedvaxHIB
(Other name for: Haemophilus influenzae b vaccine)

PEG-interferon alfa-2a
A covalent conjugate of recombinant interferon alfa, subtype 2a, and polyethylene glycol (PEG), used as an antiviral and antineoplastic agent. The biological activity of this agent is derived from its interferon alpha-2a protein moiety. Interferons alfa bind to specific cell-surface receptors, leading to the transcription and translation of genes whose protein products mediate antiviral, antiproliferative, anticancer and immune-modulating effects. The PEG moiety lowers the clearance of interferon alpha-2a, thereby extending the duration of its therapeutic effects, but may also reduce interferon-mediated stimulation of an immune response. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

PEG-interferon alfa-2b
A covalent conjugate of recombinant interferon alpha, subtype 2b, and polyethylene glycol (PEG), used as an antiviral and antineoplastic agent. The biological activity of this agent is derived from its interferon alpha-2b protein moiety. Interferons alfa bind to specific cell-surface receptors, leading to the transcription and translation of genes whose protein products mediate antiviral, antiproliferative, anticancer, and immune-modulating effects. The PEG moiety lowers the clearance of interferon alpha-2b, thereby extending the duration of its therapeutic effects, but may also reduce the interferon-mediated stimulation of an immune response. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

PEG-interleukin-2
A complex of polyethylene glycol conjugated with human recombinant cytokine interleukin-2 (IL-2) with antineoplastic activity. PEG-interleukin-2 induces natural killer (NK) cell activity and the production of interferon-gamma (IFN-gamma), and enhances T cell-mediated cytotoxicity. Pegylation of IL-2 protects the cytokine from degradation. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

PEG-Intron
(Other name for: PEG-interferon alfa-2b)

pegaspargase
A complex of polyethylene glycol conjugated with L-asparaginase. Asparaginase hydrolyzes L-asparagine to L-aspartic acid and ammonia, thereby depleting these cells of asparagine and blocking protein synthesis and tumor cell proliferation, especially in the G1 phase of the cell cycle. The agent also induces apoptosis in tumor cells. Pegylation decreases the enzyme's antigenicity. Asparagine is critical to protein synthesis in leukemic cells, which cannot synthesize this amino acid due to the absence of the enzyme asparagine synthase. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

PEGASYS
(Other name for: PEG-interferon alfa-2a)

pegfilgrastim
A long-acting pegylated form of a recombinant therapeutic agent which is chemically identical to or similar to an endogenous human granulocyte colony-stimulating factor (G-CSF). Produced endogenously by monocytes, fibroblasts, and endothelial cells, G-CSF binds to and activates specific cell surface receptors, stimulating neutrophil progenitor proliferation and differentiation and selected neutrophil functions. Conjugation of the cytokine with a branched polyethylene glycol molecule (pegylation) significantly increases its therapeutic half-life. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

pegylated anti-GFR antibody fragment
A pegylated, cross-linked, humanized divalent-Fab' antibody fragment directed against vascular endothelial growth factor receptor-2 (VEGFR-2) with potential antiangiogenic and antitumor activities. Pegylated anti-GFR antibody fragment binds to and inhibits VEGFR-2, which may inhibit angiogenesis and tumor cell proliferation. Multivalent Fab' antibody fragments may exhibit improved retention and internalization properties compared to their parent IgGs. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

pegylated granulocyte colony stimulating factor MAXY-G34
A long-acting, pegylated recombinant variant of human granulocyte colony-stimulating factor (G-CSF) with immunomodulating activity. Pegylated granulocyte colony stimulating factor MAXY-G34 contains multiple non-naturally occurring lysines that have been introduced into alpha helixes of wild type human G-CSF as pegylation sites; other naturally occurring lysine residues have been removed to prevent pegylation and the variant G-CSF is pegylated with methoxypolyethylene glycol succinimidyl propionate (mPEG SPA) at three amino acid residues. Similar to endogenous G-CSF, this agent binds to and activates specific cell surface receptors, stimulating neutrophil progenitor proliferation and differentiation and selected neutrophil functions. A difference in the degree of pegylation may account for the extended half-life of this agent compared to pegfilgrastim which is pegylated at only one amino acid residue. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

pegylated interferon alfa
A covalent conjugate of recombinant interferon alpha and polyethylene glycol (PEG), used as an antiviral and antineoplastic agent. The biological activity of this agent is derived from its interferon alpha protein moiety. Interferons alfa bind to specific cell-surface receptors, leading to the transcription and translation of genes whose protein products mediate antiviral, antiproliferative, anticancer, and immune-modulating effects. The PEG moiety lowers the clearance of interferon alpha, thereby extending the duration of its therapeutic effects, but may also reduce interferon-mediated stimulation of an immune response. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

pegylated irinotecan NKTR 102
A formulation of polyethylene glycol (PEG)-encapsulated irinotecan with antineoplastic activity. The prodrug irinotecan, a semisynthetic derivative of camptothecin, is converted to the biologically active metabolite 7-ethyl-10-hydroxy-camptothecin by a carboxylesterase-converting enzyme. One thousand-fold more potent than its parent compound irinotecan, 7-ethyl-10-hydroxy-camptothecin inhibits topoisomerase I activity by stabilizing the cleavable complex of topoisomerase I and DNA, resulting in DNA breaks that inhibit DNA replication and trigger apoptosis. Pegylation provides improved drug penetration into tumors and decreases drug clearance, thereby increasing the duration of therapeutic effects while lowering the toxicity profile. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

pegylated liposomal doxorubicin hydrochloride
A liposome-encapsulated form of the hydrochloride salt of the anthracycline antineoplastic antibiotic doxorubicin. Doxorubicin intercalates between base pairs in the DNA helix, thereby preventing DNA replication and ultimately inhibiting protein synthesis. Additionally, doxorubicin inhibits topoisomerase II which results in an increased and stabilized cleavable enzyme-DNA linked complex during DNA replication and subsequently prevents the ligation of the nucleotide strand after double-strand breakage. Doxorubicin also forms oxygen free radicals resulting in cytotoxicity secondary to lipid peroxidation of cell membrane lipids. Liposomal delivery of doxorubicin HCL improves drug penetration into tumors and decreases drug clearance, thereby increasing the duration of therapeutic drug effects; a liposomal formulation of doxorubicin also modulates toxicity, specifically the cardiac effects commonly seen with anthracycline antitumor drugs. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

pemetrexed disodium
The disodium salt of a synthetic pyrimidine-based antifolate. Pemetrexed binds to and inhibits the enzyme thymidylate synthase (TS) which catalyses the methylation of 2'-deoxyuridine-5'-monophosphate (dUMP) to 2'-deoxythymidine-5'-monophosphate (dTMP), an essential precursor in DNA synthesis. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Pen-Vee
(Other name for: penicillin V potassium)

penclomedine
A synthetic derivative of pyrimidine with antineoplastic activity. Penclomedine alkylates and crosslinks DNA, resulting in DNA strand breaks and inhibition of DNA and RNA synthesis. This agent is more active against tumor cells that are defective in p53 function. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

penicillamine
A beta dimethyl analog of the amino acid cysteine. As a degradation product of penicillin antibiotics, penicillamine chelates with heavy metals and increases their urinary excretion. Possessing antineoplastic properties, penicillamine induces apoptosis by a p53-mediated mechanism and inhibits angiogenesis by chelating with copper, a cofactor for angiogenesis. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

penicillin V potassium
The potassium salt of penicillin V, a member of the penicillin antibiotic family with broad-spectrum bactericidal activity. Penicillin V binds to and inactivates penicillin-binding proteins (PBPs), enzymes located on the inner membrane of the bacterial cell wall, resulting in the weakening of the bacterial cell wall and cell lysis. PBPs participate in the terminal stages of assembling the bacterial cell wall, and in reshaping the cell wall during cell division. Inactivation of PBPs interferes with the cross-linkage of peptidoglycan chains necessary for bacterial cell wall strength and rigidity. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

pentamethylmelamine
A principal metabolite of hexamethylmelamine with antineoplastic activity. Pentamethylmelamine alkylates DNA and other macromolecules and forms DNA intrastrand and DNA-protein crosslinks, thereby preventing DNA replication. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

pentamidine
A synthetic derivative of amidine with antiprotozoal and antifungal activities. Although the precise mode of action of pentamidine is unclear, it appears to interact directly with the pathogen genome by binding to AT-rich regions of duplex DNA and the minor groove of DNA, thereby interfering with DNA replication. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

pentetic acid calcium
The calcium salt of pentetic acid, a synthetic chelating agent related to the chelating agent ethylenediaminetetraacetic acid (EDTA). Pentetic acid chelates with the metallic radioisotopic moieties of unbound, extracellular radioimmunotherapeutic agents, resulting in higher specific tumor cell binding of radioimmunotherpeutic agents; this results in improved tumor cell radiocytotoxicity and the sparing of normal cells and tissues from the radiocytotoxic effects of these agents. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

pentosan polysulfate sodium
The sodium salt of a semisynthetic heparin-like glucosaminoglycan. Although its mechanism of action is unknown, pentosan polysulfate may act as a buffer to control cell permeability by preventing irritating solutes from reaching cells coated with it. Administered orally, excreted pentosan polysulfate adheres to the urinary bladder wall, preventing irritants from entering bladder cells and the development or progression of interstitial cystitis (IC), a complication of some chemotherapies. This agent also exhibits anticoagulant and fibrinolytic properties. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

pentostatin
A purine nucleotide analogue antibiotic isolated from the bacterium Streptomyces antibioticus. Also known as 2'-deoxycoformycin, pentostatin binds to and inhibits adenine deaminase (ADA), an enzyme essential to purine metabolism; ADA activity is greatest in cells of the lymphoid system with T-cells having higher activity than B-cells and T-cell malignancies higher ADA activity than B-cell malignancies. Pentostatin inhibition of ADA appears to result in elevated intracellular levels of dATP which may block DNA synthesis through the inhibition of ribonucleotide reductase. This agent may also inhibit RNA synthesis and may selectively deplete CD26+ lymphocytes. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

pentoxifylline
A methylxanthine derivative with hemorrheologic and immunomodulating properties. Pentoxifylline inhibits phosphodiesterase, resulting in increased levels of cyclic adenosine monophosphate (cAMP) in erythrocytes, endothelium, and the surrounding tissues. This leads to vasodilation, improves erythrocyte flexibility, and enhances blood flow. In addition, the increased level of cAMP in platelets inhibits platelet aggregation, which may contribute to a reduction in blood viscosity. This agent also inhibits production of tumor necrosis factor-alpha and interferon-gamma, while it induces Th2-like (T-helper 2) cytokine production, thereby inhibiting Th1-mediated (T-helper 1) inflammatory and autoimmune responses. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

PEP-3-KLH conjugate vaccine
A cancer vaccine consisting of PEP-3, a synthetic peptide encompassing a tumor-specific mutated segment of the epidermal growth factor receptor type vIII (EGFRvIII), conjugated to the naturally-occuring immunoadjuvant keyhole limpet hemocyanin (KLH) with potential immunostimulating and antineoplastic activities. Upon administration, PEP-3-KLH conjugate vaccine may induce a cytotoxic immune response against tumor cells that overexpress EGFRvIII; this antitumoral immune response may involve antibody-dependent cellular cytotoxicity (ADCC). Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Pepcid AC
(Other name for: famotidine)

peplomycin
A semisynthetic analog of Bleomycin, a mixture of several basic glycopeptide antineoplastic antibiotics isolated from the fungus Streptomyces verticillus. Peplomycin forms complexes with iron that reduce molecular oxygen to superoxide and hydroxyl radicals that cause single- and double-stranded breaks in DNA. This agent appears to show greater antitumor activity than bleomycin; its use is limited due to pulmonary toxicity. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Pepto-Bismol
(Other name for: bismuth subsalicylate)

Perdolat
(Other name for: penicillamine)

perflubron
A synthetic radiopaque liquid form of perfluorooctyl bromide. Used as a contrast agent for magnetic resonance imaging (MRI), perflubron is also used as a liquid ventilation agent to improve pulmonary gas exchange and lung compliance and may be used in surgery to reduce or eliminate the need for donor blood. Ventilation with perfluorocarbon fluid improves lung function in conditions involving surfactant deficiency and dysfunction, including respiratory distress syndrome and adult respiratory distress syndrome. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

perflutren lipid microspheres
An injectable suspension of liposome-encapsuled microspheres containing the fluorocarbon gas perflutren for contrast enhancement in ultrasound procedures. Because the acoustic impedance of perflutren lipid microspheres is much lower than that of blood, impinging ultrasound waves are scattered and reflected at the microsphere-blood interface and may be visualized with ultrasound imaging. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

perflutren protein-type A microspheres
A sterile non-pyrogenic suspension of microspheres of human serum albumin with the stable, high-molecular-weight fluorocarbon gas perflutren, used as a contrast enhancement agent for ultrasound procedures. Because the acoustic impedance of perflutren protein-type A microspheres is much lower than that of blood, impinging ultrasound waves are scattered and reflected at the microsphere-blood interface and may be visualized with ultrasound imaging. At the frequencies used in adult echocardiography (2-5 MHZ), the microspheres resonate which further increases the extent of ultrasound scattering and reflection. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Pergamid
(Other name for: perfosfamide)

Periactin
(Other name for: cyproheptadine hydrochloride)

perifosine
An orally active alkyl-phosphocholine compound with potential antineoplastic activity. Targeting cellular membranes, perifosine modulates membrane permeability, membrane lipid composition, phospholipid metabolism, and mitogenic signal transduction, resulting in cell differentiation and inhibition of cell growth. This agent also inhibits the anti-apoptotic mitogen-activated protein kinase (MAPK) pathway and modulates the balance between the MAPK and pro-apoptotic stress-activated protein kinase (SAPK/JNK) pathways, thereby inducing apoptosis. Perifosine has a lower gastrointestinal toxicity profile than the related agent miltefosine. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

perillyl alcohol
A naturally occurring monoterpene related to limonene with antineoplastic activity. Perillyl alcohol inhibits farnesyl transferase and geranylgeranyl transferase, thereby preventing post-translational protein farnesylation and isoprenylation and activation of oncoproteins such as p21-ras, and arresting tumor cells in the G1 phase of the cell cycle. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Permitil
(Other name for: fluphenazine hydrochloride)

Persantine
(Other name for: dipyridamole)

pertuzumab
A humanized recombinant monoclonal antibody directed against the extracellular dimerization domain of the HER-2 tyrosine kinase receptor. Binding of the antibody to the dimerization domain of the HER-2 tyrosine kinase receptor protein directly inhibits the ability of the HER-2 tyrosine kinase receptor protein (the most common pairing partner) to dimerize with other HER tyrosine kinase receptor proteins; inhibiting receptor protein dimerization prevents the activation of HER signaling pathways, resulting in tumor cell apoptosis. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

petrolatum-mineral oil-lanolin-ceresin ointment
A petrolatum-based ointment absorbed by dry and moist skin, petrolatum-mineral oil-lanolin-ceresin ointment is non-comedogenic, non-irritating, and non-sensitizing. It can reduce healing time of cracked, dry skin on hands, elbows, and knees, and helps prevent diaper rash. The original ointment also contained mineral oil, ceresin, lanolin alcohol. Its use is indicated in atopic dermatitis, eczema, and psoriasis when extra protection from a heavier base is needed. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

PF-00299804
A highly selective, orally bioavailabe small-molecule inhibitor of the HER family of tyrosine kinases with potential antineoplastic activity. PF-00299804 specifically and irreversibly binds to and inhibits human Her-1, Her-2, and Her-4, resulting in the proliferation inhibition and apoptosis of tumor cells that overexpress these receptors. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

PGLA/PEG copolymer-based paclitaxel
A controlled-release, intratumoral paclitaxel formulation in which paclitaxel is incorporated into a thermosensitive, biodegradable triblock copolymer consisting of poly(lactide-co-glycolide) (PLGA) and polyethylene glycol (PEG). Upon intratumoral injection, paclitaxel is released slowly and continuously into tumor tissues from the gelled thermosensitive triblock copolymer over a period of 4 to 6 weeks; in tumor cells, paclitaxel binds to tubulin and inhibits the disassembly-assembly dynamics of microtubules, resulting in cell cycle arrest and cell death. The thermosensitive triblock copolymer component of this formulation transforms from a water-soluble polymer at room temperature to a water-insoluble, biodegradable gel depot at body temperature; intratumoral controlled-release of paclitaxel from the gel minimizes systemic exposure to paclitaxel and the paclitaxel toxicity profile. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

PHA-739358
A small-molecule 3-aminopyrazole derivative with potential antineoplastic activity. Aurora kinase inhibitor PHA-739358 binds to and inhibits the Aurora kinases, which may result in cell growth arrest and apoptosis in tumor cells in which Aurora kinases are overexpressed. This agent may preferentially bind to and inhibit Aurora B kinase. Aurora kinases, a family of serine-threonine kinases, are important regulators of cellular proliferation and division. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Phenergan
(Other name for: promethazine hydrochloride)

phenobarbital
A long-acting barbituric acid derivative with antipsychotic property. Phenobarbital binds to and activates the gamma-aminobutyric acid (GABA)-A receptor, thereby mimicking the inhibitory actions of GABA in the brain. The activation effects of the phenobarbital-receptor-ionophore complex include increased frequency of chloride channel openings, membrane hyperpolarization and ultimately synaptic inhibition and decreased neuronal excitability. In addition, this agent inhibits glutamate induced depolarization. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

phenoxodiol
A synthetic flavonoid derivative. Phenoxodiol activates the mitochondrial caspase system, inhibits X-linked inhibitor of apoptosis (XIAP), and disrupts FLICE inhibitory protein (FLIP) expression, resulting in tumor cell apoptosis. This agent also inhibits DNA topoisomerase II by stabilizing the cleavable complex, thereby preventing DNA replication and resulting in tumor cell death. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

phentolamine mesylate
The mesylate salt of a synthetic imidazoline with alpha-adrenergic antagonist activity. As a competitive alpha-adrenergic antagonist, phentolamine binds to alpha-1 and alpha-2 receptors, resulting in a decrease in peripheral vascular resistance and vasodilatation. This agent also may block 5-hydroxytryptamine (5-HT) receptors and stimulate release of histamine from mast cells. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

phosphatidylcholine-bound silybin
An oral preparation of the flavonoid silybin with potential antioxidant and chemopreventive activities. Silybin, also known as silibinin, is a mixture of two stereoisomers, denoted silybin A and silybin B, and is the major active constituent of silymarin, a mixture of flavonolignans extracted from blessed milk thistle (Silybum marianum). Silybin modulates P-glycoprotein (P-gp)-mediated cellular efflux; has oxygen radical-scavenging effects; inhibits the arachidonic acid pathway; and inhibits various cytochrome P450 enzymes. This agent may also exhibit anti-angiogenic activity, possibly by inducing endothelial cell apoptosis via modulation of the transcription factor NF-kB, the Bcl-2 family of proteins, and caspases. Complexing silybin with phosphatidylcholine increases its bioavailability. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

phosphorodiamidate morpholino oligomer AVI-4126
A c-Myc antisense phosphorodiamidate morpholino oligomer (PMO) with potential antineoplastic activity. Phosphorodiamidate morpholino oligomer AVI-4126 binds to c-Myc mRNA and blocks its translation, which may result in the death of tumor cells overexpressing c-Myc. Differing from traditional antisense oligodeoxynucleotides (ODNs), neutrally charged PMOs are composed of subunits of nucleic acid bases linked to a synthetic backbone and, so, are less prone to enzymatic degradation. c-Myc, a proto-oncogene overexpressed in a variety of cancers, is involved in cellular proliferation, differentiation, and apoptosis. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

phosphorus P32
A radioactive isotope of phosphorus with beta particle-emitting radiocytotoxic activity. Emitted by phosphorus P32, beta particles directly damage cellular DNA and, by ionizing intracellular water to produce several types of cytotoxic free radicals and superoxides, indirectly damage intracellular biological macromolecules, resulting in tumor cell death. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Photochlor
(Other name for: HPPH)

Photofrin
(Other name for: porfimer sodium)

phytochemical
The term 'phyto' originated from a Greek word meaning plant. Phytonutrients are certain organic components of plants, and these components are thought to promote human health. Fruits, vegetables, grains, legumes, nuts and teas are rich sources of phytonutrients. Unlike the traditional nutrients (protein, fat, vitamins, minerals), phytonutrients are not 'essential' for life, so some people prefer the term 'phytochemical'. (USDA Agricultural Research Service) Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

PI-88
A mixture of highly sulfated, monophosphorylated mannose oligosaccharides, derived from the extracellular phosphomannan of the yeast Pichia (Hansenula) holstii, with potential antiangiogenic activity. Heparanase inhibitor PI-88 inhibits the endo-beta-D-glucuronidase heparanase, which may interfere with the heparanase-mediated degradation of heparan-sulfate proteoglycans in extracellular matrices, an important step in the metastatic process. This agent may also bind with high affinity to the heparan sulfate-binding domains of vascular endothelial growth factor (VEGF) and fibroblast growth factors 1 and 2, thereby reducing their functional activities and inhibiting VEGF and FGF stimulation of tumor angiogenesis. Increased heparanase activity has been implicated in tumor angiogenesis and metastasis. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

PI3K inhibitor BEZ235
An orally bioavailable phosphatidylinositol 3-kinase (PI3K) inhibitor with potential antineoplastic activity. PI3K inhibitor BEZ235 specifically inhibits PIK3 in the PI3K/AKT kinase (or protein kinase B) signaling pathway, which may trigger the translocation of cytosolic Bax to the mitochondrial outer membrane, increasing mitochondrial membrane permeability; apoptotic cell death may ensue. Bax is a member of the proapoptotic Bcl2 family of proteins. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

PI3K inhibitor BGT226
A phosphatidylinositol 3-kinase (PI3K) inhibitor with potential antineoplastic activity. PI3K inhibitor BGT226 specifically inhibits PIK3 in the PI3K/AKT kinase (or protein kinase B) signaling pathway, which may trigger the translocation of cytosolic Bax to the mitochondrial outer membrane, increasing mitochondrial membrane permeability; apoptotic cell death may ensue. Bax is a member of the proapoptotic Bcl2 family of proteins. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

PI3K/mTOR dual kinase inhibitor XL765
An orally bioavailable small molecule targeting the phosphatidylinositol 3 kinase (PI3K) and mammalian target of rapamycin (mTOR) kinases in the PI3K/mTOR signaling pathway, with potential antineoplastic activity. PI3K/mTOR dual kinase inhibitor XL765 inhibits both PI3K kinase and mTOR kinase, which may result in tumor cell apoptosis and growth inhibition in susceptible tumor cell populations. Activation of the PI3K/mTOR pathway promotes cell growth, survival, and resistance to chemotherapy and radiotherapy; mTOR, a serine/threonine kinase downstream of PI3K, may also be activated in a PI3K-independent fashion in response to nutrient and energy deprivation. Accordingly, this agent maybe more potent compared to an agent that inhibits either PI3K kinase or mTOR kinase alone. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

pibenzimol
A fluorescent dye of benzimidazole derivative. Pibenzimol binds to AT-specific sites in the minor groove of duplex DNA and inhibits topoisomerase I, and DNA polymerase, thereby preventing DNA replication. This agent prolongs the G2 phase of the cell cycle and initiates apoptosis in tumor cells. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

picoplatin
A new generation organic platinum analog with an extended spectrum of antineoplastic activity. Designed to overcome platinum drug resistance, picoplatin alkylates DNA, forming both inter- and intra-strand cross-linkages, resulting in inhibition of DNA replication and transcription, and the induction of apoptosis. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

pilocarpine hydrochloride
The hydrochloride salt of a natural alkaloid extracted from plants of the genus Pilocarpus with cholinergic agonist activity. As a cholinergic parasympathomimetic agent, pilocarpine predominantly binds to muscarinic receptors, thereby inducing exocrine gland secretion and stimulating smooth muscle in the bronchi, urinary tract, biliary tract, and intestinal tract. When applied topically to the eye, this agent stimulates the sphincter pupillae to contract, resulting in miosis; stimulates the ciliary muscle to contract, resulting in spasm of accomodation; and may cause a transitory rise in intraocular pressure followed by a more persistent fall due to opening of the trabecular meshwork and an increase in the outflow of aqueous humor. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

pioglitazone hydrochloride
The hydrochloride salt of an orally-active thiazolidinedione with antidiabetic properties and potential antineoplastic activity. Pioglitazone activates peroxisome proliferator-activated receptor gamma (PPAR-gamma), a ligand-activated transcription factor, thereby inducing cell differentiation and inhibiting cell growth and angiogenesis. This agent also modulates the transcription of insulin-responsive genes, inhibits macrophage and monocyte activation, and stimulates adipocyte differentiation. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

piperacillin sodium
The sodium salt of piperacillin, a broad-spectrum semisynthetic, ampicillin-derived ureidopenicillin antibiotic with bactericidal activity. Piperacillin binds to and inactivates penicillin-binding proteins (PBPs), enzymes located on the inner membrane of the bacterial cell wall, resulting in the weakening of the bacterial cell wall and cell lysis. PBPs participate in the terminal stages of assembling the bacterial cell wall, and in reshaping the cell wall during cell division. Inactivation of PBPs interferes with the cross-linkage of peptidoglycan chains necessary for bacterial cell wall strength and rigidity. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

piperazinedione
A crystalline antibiotic fermentation product isolated from the bacterium Streptomyces griseoluteus with antineoplastic activity. Piperazinedione alkylates DNA at the N-7 position of guanine, inhibiting DNA replication and inducing cell cycle arrest. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

piperine extract (standardized)
A standardized extract containing the active alkaloid piperine, derived from the fruit of the plant Piper nigrum (black pepper) and/or the plant Piper longum L. (long pepper), with thermogenic properties. Co-ingestion of piperidine enhances the bioavailability of various nutrients, including beta-carotene, curcumin, selenium, pyridoxine and coenzyme Q10. In addition, this agent may exert anti-inflammatory and anti-tumor activities and may enhance the production of serotonin. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Pipracil
(Other name for: piperacillin sodium)

pirarubicin
An analogue of the anthracycline antineoplastic antibiotic doxorubicin. Pirarubicin intercalates into DNA and interacts with topoisomerase II, thereby inhibiting DNA replication and repair and RNA and protein synthesis. This agent is less cardiotoxic than doxorubicin and exhibits activity against some doxorubicin-resistant cell lines. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

pirfenidone
An orally active synthetic antifibrotic agent structurally similar to pyridine 2,4-dicarboxylate. Pirfenidone inhibits fibroblast, epidermal, platelet-derived, and transforming beta-1 growth factors, thereby slowing tumor cell proliferation. This agent also inhibits DNA synthesis and the production of mRNA for collagen types I and III, resulting in a reduction in radiation-induced fibrosis. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

piritrexim
A synthetic antifolate agent with antiparasitic, antipsoriatic and antitumor properties. Piritrexim inhibits the enzyme dihydrofolate reductase enzyme, thereby disrupting folate metabolism and DNA synthesis and cell division. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

piroxantrone
An anthrapyrazole antineoplastic antibiotic. Piroxantrone intercalates into DNA and interacts with topoisomerase II, thereby inhibiting DNA replication and repair and RNA and protein synthesis. Although less cardiotoxic than doxorubicin, this agent exhibits a narrow spectrum of antineoplastic activity. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

piroxicam
A nonsteroidal oxicam derivative with anti-inflammatory, antipyretic and analgesic properties. As a non-selective, nonsteroidal anti-inflammatory drug (NSAID), piroxicam binds and chelates both isoforms of cyclooxygenases (COX1 and COX2), thereby stalling phospholipase A2 activity and conversion of arachidonic acid into prostaglandin precursors at the rate limiting cyclooxygenase enzyme step. This results in inhibition of prostaglandin biosynthesis. As a second, independent effect, piroxicam inhibits the activation of neutrophils thereby contributing to its overall anti-inflammatory effects. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

pixantrone
A synthetic noncardiotoxic aza-anthracenedione analogue. Pixantrone intercalates into DNA and induces topoisomerase II-mediated DNA strand crosslinks, resulting in inhibition of DNA replication and tumor cell cytotoxicity. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

placebo
An inactive substance, treatment or procedure that is intended to provide baseline measurements for the experimental protocol of a clinical trial. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

pladienolide derivative E7107
A synthetic urethane derivative of pladienolide D with potential antineoplastic activity. Pladienolide derivative E7107 is generated from the 12-membered macrolide pladienolide D, one of several macrolides derived from the bacterium Streptomyces platensis Mer-11107. This agent appears to bind to the 130-kDa subunit 3 (spliceosome-associated protein 130; SAP130) of the splicing factor 3b (SF3b), resulting in inhibition of pre-messenger RNA splicing and the arrest of cell-cycle progression. The splicing factor SF3b is a multiprotein complex integral to the accurate excision of introns from pre-messenger RNA; the subunit SAP130 associates with U2 snRNP and is recruited to prespliceosomal complexes. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Plan B
(Other name for: levonorgestrel)

plant-derived hematopoiesis enhancer PG2
A proprietary botanical formulation derived from a traditional Chinese medicinal (TCM) plant with hematopoietic activity. Although the mechanism of action has yet to be fully elucidated, plant-derived hematopoiesis enhancer PG2 appears to stimulate multi-lineage progenitor cells that may be closely related to the hematopoietic stem cell. In both chemotherapy- and radiation therapy-induced animal models of myelosuppression, this agent has been shown to restore granulocyte, erythrocyte, and platelet counts to normal levels. Plant-derived hematopoiesis enhancer PG2 stimulates the production of numerous cytokines such as granulocyte-colony stimulating factor (G-CSF) and may stimulate the production of neuroendocrine hormones. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Platinol-AQ
(Other name for: cisplatin)

plevitrexed
An orally bioavailable, small molecule, non-polyglutamatable, antifolate quinazoline derivative thymidine synthetase inhibitor with potential antineoplastic activity. Plevitrexed is transported into the cell via the physiological reduced folate carrier (RFC) system. Intracellularly, this agent selectively binds to the folate binding site of thymidylate synthase and inhibits thymidine synthesis, which may result in DNA synthesis inhibition and apoptosis. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

plicamycin
An antibiotic isolated from the bacterium Streptomyces plicatus with antineoplastic activity. Plicamycin, also known as mithramycin, binds to the minor groove of DNA at GC-rich sites, resulting in inhibition of RNA synthesis; this agent also inhibits mRNA expression, resulting in a reduction in protein synthesis. In addition, plicamycin may inhibit bone resorption by down regulating transcription of c-src, an oncogene involved in bone metabolism and resorption. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

plitidepsin
A cyclic depsipeptide isolated from the marine tunicate Aplidium albicans. Plitidepsin displays a broad spectrum of antitumor activities, inducing apoptosis by triggering mitochondrial cytochrome c release, initiating the Fas/DC95, JNK pathway and activating caspase 3 activation. This agent also inhibits elongation factor 1-a, thereby interfering with protein synthesis, and induces G1 arrest and G2 blockade, thereby inhibiting tumor cell growth. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Pneumovax 23
(Other name for: pneumococcal polyvalent vaccine)

pNGVL3-hICD vaccine
A plasmid DNA cancer vaccine encoding the intracellular domain (ICD) of the HER-2/neu proto-oncogene. Upon administration and after cellular uptake by skin or muscle cells, the pNGVL3-hICD vaccine plasmid expresses the HER-2/neu protein, which, after intracellular processing, may elicit both antigen-specific cytotoxic T-lymphocyte (CTL) and humoral immune responses against tumor cells expressing HER-2. The HER-2/neu ICD protein is highly immunogenic and, as a subdominant epitope, may be associated with decreased immune tolerance. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

pNGVL4a-Sig/E7(detox)/HSP70 DNA vaccine
An antigen-specific DNA cancer vaccine consisting of the coding sequences of a signal peptide (pNGVL4a-Sig), a detox form of the human papillomavirus type 16 (HPV-16) antigen E7, and the heat shock protein 70 (HSP70). Upon administration, this vaccine may generate potent cytotoxic CD8(+) T-cell responses against E7-expressing tumor cells, resulting in tumor cell death. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

PNP-expressing ovine atadenovirus FP253
An ovine atadenovirus encoding E. coli purine nucleoside phosphorylase (PNP) with prodrug activating activity. Under the control of a prostate-directed promoter, PNP-expressing atadenovirus vaccine FP253 expresses PNP in prostate tissue only after intraprostatic administration; this enzyme catalyzes systemically administered fludarabine prodrug into the active agent, 2-fluoroadenine. Localized prodrug activation provides prostate-targeted chemotherapy, potentially reducing systemic side effects. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Pnu-Imune 23
(Other name for: pneumococcal polyvalent vaccine)

polifeprosan 20 with carmustine implant
A synthetic, biodegradable wafer containing the agent carmustine with antineoplastic activity. Used to deliver drug directly into a brain tumor site and typically implanted post-surgically, the wafer is made of a biodegradable poly-anhydride copolymer and contains the nitrosourea carmustine. As an antineoplastic nitrosourea, carmustine alkylates and cross-links DNA during all phases of the cell cycle, resulting in disruption of DNA function, cell cycle arrest, and apoptosis. Carmustine also carbamoylates proteins, including DNA repair enzymes, resulting in an enhanced cytotoxic effect. Carmustine is highly lipophilic and crosses the blood-brain barrier readily. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Polo-like kinase 1 inhibitor GSK-461364
A small molecule Polo-like kinase 1 (PLK1) inhibitor with potential antineoplastic activity. Polo-like kinase 1 inhibitor GSK461364 selectively inhibits Plk1, inducing selective G2/M arrest followed by apoptosis in a variety of tumor cells while causing reversible cell arrest at the G1 and G2 stage without apoptosis in normal cells. Plk1, named after the polo gene of Drosophila melanogaster, is a serine/threonine protein kinase involved in regulating mitotic spindle function in a non-ATP competitive manner. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Polo-like kinase 1 inhibitor ON 01910.Na
A synthetic benzyl styryl sulfone analogue with potential antineoplastic activity. Polo-like kinase 1 inhibitor ON 01910.Na inhibits polo-like kinase1 (Plk1), inducing selective G2/M arrest followed by apoptosis in a variety of tumor cells while causing reversible cell arrest at the G1 and G2 stage without apoptosis in normal cells. This agent may exhibit synergistic antitumor activity in combination with other chemotherapeutic agents. Plk1, named after the polo gene of Drosophila melanogaster, is a serine/threonine protein kinase involved in regulating mitotic spindle function in a non-ATP competitive manner. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

poly AU
A synthetic polyadenylic-polyuridylic acid double-stranded RNA. Poly AU may stimulate the release of cytotoxic cytokines and, by inducing the production of interferon, may increase the number and tumoricidal activities of various immunohematopoietic cells. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

poly IC
A synthetic polyinosinic-polycytidylic acid double-stranded RNA. Poly IC may stimulate the release of cytotoxic cytokines and, by inducing interferon-gamma production, may increase the number and tumoricidal activities of various immunohematopoietic cells. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

poly ICLC
A synthetic complex of carboxymethylcellulose, polyinosinic-polycytidylic acid, and poly-L-lysine double-stranded RNA. Poly ICLC may stimulate the release of cytotoxic cytokines and, by inducing interferon-gamma production, may increase the tumoricidal activities of various immunohematopoietic cells. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

polyamine analogue PG11047
A second generation polyamine analogue, synthesized through the restriction of molecular conformations of parent polyamine compounds, with potential antineoplastic activity. Polyamine analogue PG11047 may displace endogenous polyamines from DNA binding sites, thereby interfering with cell cycle processes dependent upon polyamine binding and function, and resulting in cell-cycle arrest, induction of apoptosis, depletion of polyamines, and interference with gene and ligand-receptor activities involved with cell growth. This agent may exhibit decreased toxicity and enhanced cytotoxicity profiles compared to first-generation polyamine compounds. In tumor cells, there is an increase dependence on polyamines as well as a dysregulated polyamine metabolic pathway resulting in abnormal or sustained tumor growth. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

polyethyleneglycol-7-ethyl-10-hydroxycamptothecin
A polyethylene glycol (PEG) conjugate of 7-ethyl-10-hydroxycamptothecin with potential antineoplastic activity. After hydrolysis in vivo, 7-ethyl-10-hydroxycamptothecin (SN38), an active metabolite of irinotecan, is released from polyethyleneglycol-7-ethyl-10-hydroxycamptothecin (PEG-SN38); 7-ethyl-10-hydroxycamptothecin selectively stabilizes topoisomerase I-DNA covalent complexes, resulting in single-stranded and double-stranded DNA breaks, the inhibition of DNA replication, and the induction of apoptosis. This agent is designed to deliver the active metabolite to tumor cells without the need for conversion as is the case with irinotecan. Compared to unPEGylated 7-ethyl-10-hydroxycamptothecin, PEGylation improves solubility and allows for parental delivery, and may result in a longer half-life and higher exposure for tumor cells. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Polygam S/D
(Other name for: therapeutic immune globulin)

polyglutamate camptothecin
A therapeutic formulation consisting of camptothecin, an alkaloid isolated from the Chinese tree Camptotheca acuminata, conjugated with polyglutamate. During the S phase of the cell cycle, camptothecin selectively stabilizes topoisomerase I-DNA covalent complexes, thereby inhibiting religation of topoisomerase I-mediated single-strand DNA breaks and producing potentially lethal double-strand DNA breaks when encountered by the DNA replication machinery. Conjugation with polyglutamate renders this agent more water soluble and less toxic than the parent molecule. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

polymeric camptothecin prodrug XMT-1001
A polymeric prodrug of camptothecin (CPT) with potential antineoplastic activity. Polymeric camptothecin prodrug XMT-1001 consists of CPT conjugated to the 60-70 kDa, inert, bio-degradable, hydrophilic copolymer poly[1-hydroxymethylene hydroxymethyl formal] (PHF). Through a dual-phase, non-enzymatic release mechansim, CPT is first released in plasma from XMT-1001 as the lipophilic prodrugs CPT-SI (a succinimidoglycinate derivative) and CPT-SA (a succinamidoyl glycinate derivative), which are then hydrolyzed within tissues to release the lactone form of CPT. CPT inhibits the catalytic activity of DNA topoisomerase I, thereby inhibiting DNA replication and inducing apoptosis. This agent may exhibit a more favorable pharmacokinetic profile than other agents in the same class. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Polymox
(Other name for: amoxicillin)

Polyphenon E Ointment
(Other name for: kunecatechins ointment)

polysaccharide-K
Protein-bound polysaccharide from the mushroom Coriolus versicolor (Shitake); a biological response modifier with antitumor activity. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

polyunsaturated fatty acid
A fatty acid containing more than one double bond (C=C). The essential fatty acids omega-3 and omega-6 are polyunsaturated fatty acids (PUFAs) that contain 2 or more cis double bonds. Dietary intake of some PUFAs may have beneficial effects on blood pressure, serum lipds, and inflammation. Some PUFAs, such as omega-3 PUFAs, may have antineoplastic or chemopreventive activities. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

polyvalent melanoma vaccine
A cancer vaccine consisting of whole irradiated heterologous melanoma cells which express multiple melanoma-related antigens. Polyvalent melanoma vaccine may stimulate an antitumoral cytotoxic T-cell immune response in the host, resulting in inhibition of tumor cell proliferation and tumor cell death. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

polyvinylpyrrolidone-sodium hyaluronate gel
An oral bioadherent gel containing polyvinylpyrrolidone (PVP) and sodium hyaluronate with muco-protective activity. Upon oral application, this gel adheres to the mucosal surface of the mouth and throat, forming a thin layer that acts as a barrier to protect exposed and sensitized nerve endings from the painful stimuli associated with eating, drinking, and talking. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

pomegranate juice
A natural juice isolated from the fruit of the plant Punica granatum with antioxidant, potential antineoplastic, and chemopreventive activities. Pomegranate juice contains flavonoids which promote differentiation and apoptosis in tumor cells by down-regulating vascular endothelial growth factor (VEGF) and stimulating migration inhibitory factor (MIF), thereby inhibiting angiogenesis. The flavanoids in pomegranate juice also scavenge reactive oxygen species (ROS) and, in some cell types, may prevent ROS-mediated cell injury and death. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

porfimer sodium
The sodium salt of a mixture of oligomers formed by ether and ester linkages of up to eight porphyrin units with photodynamic activity. Absorbed selectively by tumor cells, porfimer produces oxygen radicals after activation by 630 nm wavelength laser light, resulting in tumor cell cytotoxicity. In addition, tumor cell death may occur due to ischemic necrosis secondary to vascular occlusion that appears to be partly mediated by the release of thromboxane A2. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

porfiromycin
An N-methyl derivative of the antineoplastic antibiotic mitomycin C isolated from the bacterium Streptomyces ardus and other Streptomyces bacterial species. Bioreduced porfiromycin generates oxygen radicals and alkylates DNA, producing interstrand cross-links and single-strand breaks, thereby inhibiting DNA synthesis. Porfiromycin is preferentially toxic to hypoxic cells. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

posaconazole
A broad-spectrum, second generation, triazole compound with antifungal activity. Posaconazole strongly inhibits 14-alpha demethylase, a cytochrome P450-dependent enzyme. Inhibition of 14-alpha-demethylase prevents the conversion of lanosterol to ergosterol, an important component of the fungal cell wall. Inhibition of ergosterol synthesis changes the fungal cell membrane composition and integrity, alters membrane permeability and eventually leads to fungal cell lysis. Compared to other azole antifungals, posaconazole is a significantly more potent inhibitor of sterol 14-alpha demethylase. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

povidone-iodine solution
An iodophor solution containing a water-soluble complex of iodine and polyvinylpyrrolidone (PVP) with broad microbicidal activity. Free iodine, slowly liberated from the povoiodine-iodine (PVPI) complex in solution, kills eukaryotic or prokaryotic cells through iodination of lipids and oxidation of cytosplasmic and membrane compounds. This agent exhbits a broad range of microbicidal activity against bacteria, fungi, protozoa, and viruses. Slow release of iodine from the PVPI complex in solution minimizes iodine toxicity towards mammalian cells. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

PP14 derivative-treated HLA-matched donor mononuclear cell-enriched leukocytes
A preparation of allogeneic HLA-matched leukocytes treated with a derivative of placental protein 14 (PP14) with potential immunomodulating activity. PP14 derivative-treated HLA-matched donor mononuclear cell-enriched leukocytes contain at least fifty-five percent early-apoptotic T cells; after infusion and when processed by recipient dendritic cells, early-apoptotic T cells may help induce a decrease in the donor effector T-cell responses against the recipient of an allogeneic hematopoietic stem cell (HSC) transplant, thereby minimizing allogeneic HSC transplant-related graft-versus-host disease (GVHD). PP14, a 162 amino acid glycosylated protein secreted by the late secretory phase endometrium, binds to T cells in a carbohydrate fashion and has been shown to induce T-cell apoptosis; maternal immune tolerance to the fetus and pregnancy-related remissions of autoimmune disease may involve PP14-induced T cell apoptosis. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

PPI-2458
A synthetic derivative of fumagillin with antineoplastic and cytotoxic properties. PPI-2458 irreversibly inhibits the enzyme methionine aminopeptidase type 2 (MetAP2), thereby preventing abnormal cell growth and angiogenesis. PPI-2458 is reported to have a better toxicity profile compared to other agents of its class. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

PR-104
A non-toxic, small-molecule, hypoxia-activated, 3,5-dinitrobenzamide nitrogen mustard pre-prodrug with potential antitumor activity. Upon intravenous administration, PR-104 is converted by systemic phosphatases to the alcohol intermediate PR-104A, which is reduced to form the active DNA-crosslinking mustard species hydroxylamine PR-104H intracellularly under hypoxic conditions. PR-104H specifically crosslinks hypoxic tumor cell DNA, resulting in the inhibition of DNA repair and synthesis, cell-cycle arrest, and apoptosis in susceptible hypoxic tumor cell populations while sparing normoxic tissues. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

PR-171
An epoxomicin derivate with potential antineoplastic activity. PR-171 irreversibly binds to and inhibits the chymotrypsin-like activity of the 20S proteasome, an enzyme responsible for degrading a large variety of cellular proteins. Inhibition of proteasome-mediated proteolysis results in an accumulation of polyubiquinated proteins, which may lead to cell cycle arrest, induction of apoptosis, and inhibition of tumor growth. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

PR1 leukemia peptide vaccine
A cancer vaccine containing PR1, a 9 amino-acid human leukocyte antigen (HLA)-A2 restricted peptide derived from proteinase 3, with potential immunotherapeutic activity. Vaccination with PR1 leukemia peptide vaccine may stimulate the host immune system to mount a cytotoxic T lymphocyte (CTL) response against tumor cells expressing proteinase 3, resulting in tumor cell lysis. Often overexpressed in leukemic cells, proteinase 3 is a serine proteinase that activates progelatinase A and is involved in angiogenesis and metastasis. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

pravastatin
The sodium salt of pravastatin with cholesterol-lowering and potential antineoplastic activities. Pravastatin competitively inhibits hepatic hydroxymethyl-glutaryl coenzyme A (HMG-CoA) reductase, the enzyme which catalyzes the conversion of HMG-CoA to mevalonate, a key step in cholesterol synthesis. This agent lowers plasma cholesterol and lipoprotein levels, and modulates immune responses by suppressing MHC II (major histocompatibility complex II) on interferon gamma-stimulated, antigen-presenting cells such as human vascular endothelial cells. In addition, pravastatin, like other statins, exhibits pro-apoptotic, growth inhibitory, and pro-differentiation activities in a variety of tumor cells; these antineoplastic activities may be due, in part, to inhibition of the isoprenylation of Ras and Rho GTPases and related signaling cascades. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Precose
(Other name for: acarbose)

Prednicen-M
(Other name for: prednisone)

prednisolone
A synthetic glucocorticoid with anti-inflammatory and immunomodulating properties. After cell surface receptor attachment and cell entry, prednisolone enters the nucleus where it binds to and activates specific nuclear receptors, resulting in an altered gene expression and inhibition of proinflammatory cytokine production. This agent also decreases the number of circulating lymphocytes, induces cell differentiation, and stimulates apoptosis in sensitive tumor cells populations. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

prednisone
A synthetic glucocorticoid with anti-inflammatory and immunomodulating properties. After cell surface receptor attachment and cell entry, prednisone enters the nucleus where it binds to and activates specific nuclear receptors, resulting in an altered gene expression and inhibition of proinflammatory cytokine production. This agent also decreases the number of circulating lymphocytes, induces cell differentiation, and stimulates apoptosis in sensitive tumor cells populations. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

pregabalin
A 3-isobutyl derivative of gamma-amino butyric acid (GABA) with anti-convulsant, anti-epileptic, anxiolytic, and analgesic activities. Although the exact mechanism of action is unknown, pregabalin selectively binds to alpha2delta (A2D) subunits of presynaptic voltage-dependent calcium channels (VDCCs) located in the central nervous system (CNS). Binding of pregabalin to VDCC A2D subunits prevents calcium influx and the subsequent calcium-dependent release of various neurotransmitters, including glutamate, norepinephrine, serotonin, dopamine, and substance P, from the presynaptic nerve terminals of hyperexcited neurons; synaptic transmission is inhibited and neuronal excitability is diminished. Pregabalin does not bind directly to GABA-A or GABA-B receptors and does not alter GABA uptake or degradation. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Pregnyl
(Other name for: recombinant human chorionic gonadotropin)

Prelay
(Other name for: troglitazone)

Prelone
(Other name for: prednisolone)

Premarin
(Other name for: conjugated estrogens)

Prialt
(Other name for: ziconotide)

Prilosec
(Other name for: omeprazole)

prinomastat
A synthetic hydroxamic acid derivative with potential antineoplastic activity. Prinomastat inhibits matrix metalloproteinases (MMPs) (specifically, MMP-2, 9, 13, and 14), thereby inducing extracellular matrix degradation, and inhibiting angiogenesis, tumor growth and invasion, and metastasis. As a lipophilic agent, prinomastat crosses the blood-brain barrier. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

probenecid
A benzoic acid derivative with antihyperuricemic property. Probenecid competitively inhibits the active reabsorption of urate at the proximal tubule in the kidney thereby increasing urinary excretion of uric acid and lowering serum urate concentrations. This prevents urate deposition and promotes resolution of existing urate deposits. In addition, probenecid modulates the transport of organic acids and acidic drugs at the proximal and distal renal tubule, thereby increasing the drug serum concentration. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

procarbazine hydrochloride
The hydrochloride salt of a methylhydrazine derivative with antineoplastic and mutagenic activities. Although the exact mode of cytotoxicity has not been elucidated, procarbazine, after metabolic activation, appears to inhibit the trans-methylation of methionine into transfer RNA (t-RNA), thereby preventing protein synthesis and consequently DNA and RNA synthesis. This agent may also undergo auto-oxidation, resulting in the formation of cytotoxic free radicals which damage DNA through an alkylation reaction. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

prochlorperazine
A synthetic propylpiperazine derivative of phenothiazine with antiemetic, antipsychotic, antihistaminic, and anticholinergic activities. Prochlorperazine antagonizes the dopamine D2-receptor in the chemoreceptor trigger zone (CTZ) of the brain and may prevent chemotherapy-induced emesis. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Procrit
(Other name for: epoetin alfa)

Proctocort
(Other name for: therapeutic hydrocortisone)

Profasi
(Other name for: recombinant human chorionic gonadotropin)

progenipoietin
A recombinant, chimeric, dual-receptor agonist fusion protein with immunohematopoietic activity. Progenipoietin (ProGP) consists of portions of the ligands for granulocyte colony-stimulating factor (G-CSF) and human fetal liver tyrosine kinase-3 (FLT3); variants progenipoietin-1, 2 and 3 differ in the orientation of the two receptor agonists. ProGP binds simultaneously to G-CSF and FLT3 receptors with receptor affinities approximately two- to three-fold higher than the respective native ligands. When administered in vivo, this agent may augment the number of circulating granulocytes and dendritic cells (DCs). ProGP may promote the proliferation of and prevent apoptosis in several human hematopoietic cell lineages, exhibiting the additive activities of a combination of C-GSF and FLT3. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

progesterone receptor antagonist ZK 230211
An orally bioavailable pentafluoroethyl derivative of a mifepristone-related steroid with antiprogestagenic activity. Progesterone receptor antagonist ZK 230211 is a pure, highly receptor-selective progesterone receptor (PR) antagonist; binding of this agent to PRs inhibits PR activation and the associated proliferative effects. Unlike many other antiprogestins such as mifepristone, this agent does not appear to convert to an agonist in the presence of protein kinase A (PKA) activators and shows high antiprogestagenic activity on both progesterone receptor (PR) isoforms PR-A and PR-B. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Progestin
(Other name for: therapeutic progesterone)

Prokine
(Other name for: sargramostim)

Proleukin
(Other name for: aldesleukin)

Prolixin
(Other name for: fluphenazine hydrochloride)

promethazine hydrochloride
The hydrochloride salt form of promethazine, a phenothiazine derivative with antihistaminic, sedative and antiemetic properties. Promethazine hydrochloride selectively blocks peripheral H1 receptors thereby diminishing the effects of histamine on effector cells. Promethazine hydrochloride also blocks the central histaminergic receptors, thereby depressing the reticular system causing sedative and hypnotic effects. In addition, promethazine hydrochloride also has centrally acting anticholinergic properties and probably mediates nausea and vomiting by acting on the medullary chemoreceptive trigger zone. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

ProMune
(Other name for: CpG 7909)

Promycin
(Other name for: porfiromycin)

propofol
A hypnotic alkylphenol derivative. Formulated for intravenous induction of sedation and hypnosis during anesthesia, propofol facilitates inhibitory neurotransmission mediated by gamma-aminobutyric acid (GABA). This agent is associated with minimal respiratory depression and has a short half-life with a duration of action of 2 to 10 minutes. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

propylthiouracil
A thiourea derivative with antithyroid property. Propylthiouracil (PTU) interferes with the oxidation of iodine possibly by interaction with peroxidase or a peroxidase-mediated complex reaction, thereby inhibiting synthesis of thyroid hormones tri-iodothyronine (T3) and thyroxine (T4). In addition, this agent inhibits the Type I 5'-deiodinase (D1), an enzyme involved in the peripheral conversion of thyroxine to tri-iodothyronine. This results in decreased plasma triodothyronine concentrations and decreased entrance of thyroxine into cells thereby reducing thyroid hormone activity. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Proscar
(Other name for: finasteride)

prostate cancer vaccine ONY-P1
A cell-based vaccine derived from prostate cancer with potential immunopotentiating and antineoplastic activities. Prostate cancer vaccine ONY-P1 is derived from three irradiated allogeneic prostate cancer cell lines that represent different stages of prostate cancer and express a broad range of prostate and prostate cancer antigens. Upon adminstration, this vaccine may stimulate a host immune response against prostate cancer cells; in the vaccination schedule, the first two vaccinations are co-administered with bacillus Calmette-Guerin (BCG) as an adjuvant. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

prostatic acid phosphatase-sargramostim fusion protein
A genetically-engineered protein formed by the fusion of prostatic acid phosphatase (PAP) and sargramostim (GM-CSF). Vaccination with antigen-presenting cells (APC) loaded with prostatic acid phosphatase-sargramostim fusion protein may elicit a cytotoxic T-cell response against tumor cells that express PAP. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

PROSTVAC
(Other name for: recombinant vaccinia prostate-specific antigen vaccine)

proteasome inhibitor CEP 18770
An orally bioavailable synthetic P2 threonine boronic acid inhibitor of the chymotrypsin-like activity of the proteasome, with potential antineoplastic activity. Proteasome inhibitor CEP 18770 represses the proteasomal degradation of a variety of proteins, including inhibitory kappaBalpha (IkappaBalpha), resulting in the cytoplasmic sequestration of the transcription factor NF-kappaB; inhibition of NF-kappaB nuclear translocation and transcriptional up-regulation of a variety of cell growth-promoting factors; and apoptotic cell death in susceptible tumor cell populations. In vitro studies indicate that this agent exhibits a favorable cytotoxicity profile toward normal human epithelial cells, bone marrow progenitors, and bone marrow-derived stromal cells relative to the proteasome inhibitor bortezomib. The intracellular protein IkappaBalpha functions as a primary inhibitor of the proinflammatory transcription factor NF-kappaB. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

proteolytic enzymes
Enzymes produced and secreted by the pancreas which aid in the proteolysis of proteins in the digestive tract. Pancreatic proteolytic enzymes include trypsin, chymotrypsin and carboxypeptidase; these enzymes are secreted as zymogens, inactive precursors of the enzymes, and are activated in the lumen of the digestive canal. Another proteolytic enzyme, enteropeptidase, is associated with the brush border of enterocytes; this enzyme catalyses the conversion of trypsinogen into trypsin which, in turn, can activate a number of other pancreatic zymogens. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)

Provecta
(Other name for: PV-10)

Provenge
(Other name for: sipuleucel-T)

Proventil
(Other name for: albuterol sulfate)

Provera
(Other name for: medroxyprogesterone)

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