Inclusion Criteria:

1. Age ≥ 18 years
2. Histologically or cytologically confirmed advanced solid tumor that has relapsed, is refractory to standard treatment, or for whom there is no standard therapy available.
3. Eastern Cooperative Oncology Group (ECOG) performance status of < 2

4. Normal organ and marrow function as defined below within 14 days of study entry

   1. Absolute neutrophil count (ANC) ≥ 1.5 x 109/L
   2. Platelet count ≥100 x 109/L
   3. Hemoglobin > 9 g/dL
   4. Total bilirubin < 1.5 x upper limit of normal (ULN)
   5. Aspartate aminotransferase (AST) and alanine aminotransferase (ALT) ≤ 2.5 x upper limit of normal (ULN), or 5 x ULN for subjects with liver metastases
   6. Serum creatinine ≤ 1.5 x ULN or calculated estimated creatinine clearance ≥ 50 mL/min/1.73m2 for subjects with creatinine levels above institutional normal based on the Cockcroft and Gault formula.
5. Never received prior TLI or topotecan HCl (Hycamtin®)
6. At least 4 weeks must have elapsed from the last dose of chemotherapy.
7. Life expectancy ≥ 3 months
8. Women of childbearing potential must have a negative urine or blood pregnancy test within 7 days prior to initiation of treatment.
9. If female, subject is post-menopausal, surgically sterilized, or willing to use acceptable methods of birth control (e.g., hormonal contraceptive, intra-uterine device (IUD), diaphragm with spermicide, condom with spermicide or abstinence) from the screening visit through the duration of study participation.
10. If male, subject agrees to use an acceptable barrier method for contraception from the screening visit though the duration of study participation.
11. Before enrollment, the subject is capable of understanding and complying with parameters as outlined in the protocol and able to sign a written informed consent according to ICH/GCP, and national/local regulations.

Exclusion Criteria:

1. Use of any investigational drugs, biologics, or devices within 28 days prior to study treatment or planned use during the course of the study.
2. Primary tumors of central nervous system (CNS). Symptomatic brain metastases (unless subject is stable without requirement of steroids and/or antiseizure medications for at least three months) or leptomeningeal tumor involvement. Imaging studies are not required to rule this out unless there is a clinical suspicion of CNS disease.
3. Prior chemotherapy or radiotherapy within 4 weeks of Day 1 of study (6 weeks for nitrosureas or mitomycin C).
4. Planned concurrent systemic therapy (cytotoxic and/or cytostatic) and/or radiotherapy during study treatment.
5. Less than 4 weeks have elapsed from the time of major surgery.
6. Subjects with a history of allergic reactions or sensitivity attributed to compounds of similar chemical or biologic composition to TLI, including known allergies to the ingredients comprising the liposome (e.g., cholesterol and/or sphingomyelin), which in the Investigator's opinion may put the subject at risk for significant reaction to the study drug.
7. Subjects who are pregnant or lactating.
8. Subjects known to be positive for human immunodeficiency virus (HIV), hepatitis C antibody, or hepatitis B surface antigen.
9. Prophylactic hematologic growth factors administered ≤ 2 weeks prior to start of treatment with TLI (excluding darbepoetin alfa and epoetin alfa).
10. Active infection or any serious underlying medical condition, which would impair the ability of the subject to receive protocol treatment.