1.	Exemestane in Preventing Cancer in Postmenopausal Women at Increased Risk of Developing Breast Cancer Phase: Phase III Type: Prevention Status: Active Age: 35 and over Sponsor: Other, Pharmaceutical / Industry Protocol IDs: CAN-NCIC-MAP3, PFIZER-EXEAPO-0028-150, ExCel, NCT00083174, MAP3
2.	Letrozole in Preventing Cancer in Postmenopausal Women Who Have Received 4-6 Years of Hormone Therapy for Hormone Receptor-Positive, Lymph Node-Positive, Early-Stage Breast Cancer Phase: Phase III Type: Prevention Status: Active Age: Postmenopausal Sponsor: Other Protocol IDs: IBCSG-35-07, IBCSG-35-07, BIG-1-07-SOLE, EUDRACT-2007-001370-88, NCT00553410
3.	Letrozole in Preventing Breast Cancer in Postmenopausal Women With a BRCA1 or BRCA2 Mutation Phase: Phase III Type: Biomarker/Laboratory analysis, Prevention Status: Active Age: 40 to 69 Sponsor: Other, Pharmaceutical / Industry Protocol IDs: FNCLCC-ONCO-03/0701, FNCLCC-ONCO 03/0701 - LIBER, EU-20806, NOVARTIS-FNCLCC-ONCO 03/0701, NCT00673335
4.	Radiation Therapy to the Head in Preventing Brain Metastases in Women Receiving Trastuzumab and Chemotherapy for Metastatic or Locally Advanced Breast Cancer Phase: Phase III Type: Prevention, Treatment Status: Active Age: 18 and over Sponsor: Other Protocol IDs: ACCOG-HER-PCI, ACCOG-HER-PCI, ISRCTN64624715, EU-20822, NCT00639366
5.	Prevention of Breast Cancer: As Simple as hCG-A Randomized Clinical Trial in High Risk Women Phase: Phase III Type: Prevention Status: Active Age: 30 to 75 Sponsor: Other Protocol IDs: GD-10-08, NCT00808522
6.	Deslorelin Combined With Low-Dose Add-Back Estradiol and Testosterone in Preventing Breast Cancer in Premenopausal Women Who Are at High Risk for This Disease Phase: Phase II Type: Prevention Status: Active Age: 21 to 48 Sponsor: NCI Protocol IDs: CHNMC-IRB-02164, NCT00080756
7.	Exemestane in Treating Postmenopausal Women at High Risk for Invasive Breast Cancer Phase: Phase II Type: Prevention Status: Active Age: Postmenopausal Sponsor: NCI Protocol IDs: GUMC-2007-313, NCI-04-C-0044, NCT00085072, GUMC-2007-313, GT 07-313, 2007-313
8.	Soy Protein and Breast Cancer Risk Reduction Phase: Phase II Type: Prevention Status: Active Age: 30 to 40 Sponsor: Other Protocol IDs: 02-422, Army's HSRRB log no. A-10926, UTMB GCRC 533, DAMD17-01-1-0417, NIH NCRR GCRC M01 RR00073, NCT00204477
9.	Soy Isoflavones and Breast Cancer Risk Reduction Phase: Phase II Type: Prevention Status: Active Age: 30 to 42 Sponsor: NCI, Other Protocol IDs: 03-260, UTMB GCRC #635, NIH R01-CA95545, NIH NCRR GCRC M01 RR00073, NCT00204490
10.	Phase II Trial - Breast Cancer Chemoprevention by Lovastatin Phase: Phase II Type: Biomarker/Laboratory analysis, Diagnostic, Prevention Status: Active Age: 18 to 70 Sponsor: Other Protocol IDs: BRSNSTU0010, NCT00285857
11.	Simvastatin in Preventing a New Breast Cancer in Women Who Are at High Risk for a New Breast Cancer After Undergoing Surgery for Ductal Carcinoma in Situ or Stage I, Stage II, or Stage III Breast Cancer Phase: Phase II Type: Biomarker/Laboratory analysis, Prevention Status: Active Age: 18 and over Sponsor: NCI Protocol IDs: JHOC-J0485, J0485, JHOC-SKCCC-J0485, JHOC-04100404, NCT00334542
12.	Prophylactic Irradiation to the Contralateral Breast for BRCA Mutation Carriers Undergoing Treatment for Breast Cancer Phase: Phase II Type: Prevention Status: Approved-not yet active Age: 30 to 90 Sponsor: Other Protocol IDs: 102/07, NCT00496288
13.	Study of Breast Cancer Prevention by Letrozole in High Risk Women Phase: Phase II Type: Prevention Status: Active Age: 30 to 69 Sponsor: NCI, Other Protocol IDs: 10587, NCT00579826
14.	Acolbifene in Preventing Cancer in Premenopausal Women at High Risk of Breast Cancer Phase: Phase II Type: Biomarker/Laboratory analysis, Prevention Status: Active Age: 30 to 55 Sponsor: NCI Protocol IDs: WCCC-UW-CO06101, KUMC-HSC-10588, KUMC HSC 10588, WCCC-UWI05-6-01, NCT00853996
15.	Vitamin D in Postmenopausal Women at High Risk for Breast Cancer Phase: Phase II Type: Prevention Status: Active Age: 21 and over Sponsor: Other Protocol IDs: Protocol Dated 121308, AAAD3638, NCT00859651
16.	Vitamin D3 for Aromatase Inhibitor Induced Arthralgias Phase: Phase II Type: Prevention Status: Active Age: 18 and over Sponsor: Other Protocol IDs: 11548, NCT00867217
17.	IH636 Grape Seed Extract in Preventing Breast Cancer in Postmenopausal Women at Risk of Developing Breast Cancer Phase: Phase I Type: Prevention Status: Active Age: 40 to 75 Sponsor: NCI Protocol IDs: CHNMC-IRB-03178, NCT00100893
18.	Green Tea Extract in Treating Women With Hormone Receptor-Negative Stage I, Stage II, or Stage III Breast Cancer Phase: Phase I Type: Biomarker/Laboratory analysis, Prevention, Treatment Status: Active Age: 21 to 65 Sponsor: NCI Protocol IDs: MDA-MDA04-4-01, MDA04-4-01, NCT00516243, MDA-2006-0521, CPMC-IRB-AAAB7638
19.	Atorvastatin in Preventing Breast Cancer in Women at Increased Risk for Breast Cancer Phase: Phase I Type: Biomarker/Laboratory analysis, Prevention Status: Active Age: 18 to 72 Sponsor: NCI Protocol IDs: MDA-MDA05-6-01, MDA05-6-01, MDA-2006-0185, NCT00637481
20.	White Button Mushroom Extract in Preventing the Recurrence of Breast Cancer in Postmenopausal Breast Cancer Survivors Phase: Phase I Type: Biomarker/Laboratory analysis, Prevention Status: Active Age: 21 and over Sponsor: NCI Protocol IDs: CHNMC-07213, 07213, NCT00709020
21.	Anastrozole in Preventing Breast Cancer in Postmenopausal Women at Increased Risk of Breast Cancer Phase: No phase specified Type: Prevention Status: Active Age: 40 to 70 Sponsor: Other Protocol IDs: CRUK-IBIS-IIB, EU-20227, NCT00078832, IBCSG-31-03-PREV, EUDRACT-2004-003991-12
22.	Exercise in Preventing Breast Cancer in Healthy Young Women Phase: No phase specified Type: Diagnostic, Prevention Status: Active Age: 18 to 30 Sponsor: NCI Protocol IDs: UMN-0505M69867, NCT00393172
23.	Effect of a Low-Calorie Diet and/or Exercise Program on Risk Factors for Developing Breast Cancer in Overweight or Obese Postmenopausal Women Phase: No phase specified Type: Behavioral study, Biomarker/Laboratory analysis, Prevention Status: Active Age: 50 to 75 Sponsor: NCI Protocol IDs: FHCRC-PHS-1960.00, FHCRC-1960, PHS 1960.00, NCT00470119
24.	Studying the Effect of Freeze-Dried Table Grape Powder on Blood Estrogen Levels in Postmenopausal Women Phase: No phase specified Type: Biomarker/Laboratory analysis, Prevention Status: Active Age: 18 and over Sponsor: NCI Protocol IDs: MAYO-MC0536, MC0536, NCT00611104
25.	DAMES: Daughters And MothErS Against Breast Cancer Phase: No phase specified Type: Behavioral study, Prevention Status: Active Age: 21 and ov er Sponsor: NCI, Other Protocol IDs: 2007-0756, NCT00630591