a study on Breast Cancer
This study is looking at whether Metformin, an agent that is commonly used to treat diabetes, can decrease or affect the ability of breast cancer cells to grow and whether Metformin will work with other therapies to keep cancer from recurring. Health Canada has not approved the sale or use of Metformin to treat breast cancer, although they have approved its use in this clinical trial. Although Metformin is approved by the FDA for the treatment of diabetes, its use in breast cancer is considered investigational.
A Phase III Randomized Trial of Metformin Versus Placebo on Recurrence and Survival in Early Stage Breast Cancer
OUTLINE: This is a multicenter study. Patients are stratified according to hormone-receptor status (estrogen receptor- and/or progesterone receptor- positive vs both receptors negative), body mass index (≤ 30 vs> 30 kg/m²), HER2 status (positive vs negative), and prior chemotherapy (any vs none). Patients are randomized to 1 of 2 treatment arms.
Blood and tumor samples are collected periodically for correlative studies.
Patients may complete quality-of-life, physical activity, and diet questionnaires at baseline and at 6, 12, 24, 36, 48, and 60 months. (Sub-set of patients).
After completion of study treatment, patients are followed annually.
Breast Cancer stage I breast cancer stage II breast cancer stage IIIA breast cancer stage IIIC breast cancer male breast cancer HER2-negative breast cancer estrogen receptor-positive breast cancer HER2-positive breast cancer progesterone receptor-positive breast cancer Metformin
For people ages 18–74
Sentinel lymph node biopsy alone is allowed in the following instances:
Definitive surgery and/or chemotherapy have been completed at least 4 weeks prior to randomization. Surgical margins must be clear of invasive carcinoma. If there is microscopic residual ductal in situ disease present at lumpectomy or total mastectomy margins, further excision is highly recommended. If further excision is not undertaken,the subject may still be entered on study, provided that in addition to breast or chest wall irradiation, a boost to the tumour bed is delivered. In situ lobular disease at the margin is acceptable.
Adjuvant subjects with the following pT pN combinations are eligible:
Subjects with pT1-3, pN1-3
The eligibility of neo-adjuvant subjects is assessed on the basis of cTNM. The same eligible TNM combinations apply.
Biochemistry investigations have been completed within 28 days prior to randomization and values are within the parameters required by the protocol.
AST < 1.8 X ULN; ALT < 1.8 X ULN; Alkaline Phosphatase < 2 X ULN; Serum Creatinine < 115 μmol/L (1.3mg/dL) Serum Bilirubin < institution ULN (except for subjects with Gilbert's Disease who are eligible despite elevated serum bilirubin level)
Subject consent must be obtained according to local Institutional and/or University Human Experimentation Committee requirements. It will be the responsibility of the local participating investigators to obtain the necessary local clearance, and to indicate in writing to the NCIC CTG Study Coordinator that such clearance has been obtained, before the trial can commence in that centre. Because of differing requirements, a standard consent form for the trial will not be provided but a sample form is given. A copy of the initial full board REB approval and approved consent form must be sent to the central office. The patient must sign the consent form prior to randomization or registration. Please note that the consent form for this study must contain a statement which gives permission for the NCIC CTG and monitoring agencies to review patient records (see Section 16 for further details).
For the first 888 eligible English or French-speaking subjects only (sub-set enrollment completed 2011NOV04):
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