Conditions: Breast Cancer; Depression; Fatigue; Sleep Disorders
Interventions: Drug: metformin hydrochloride; Genetic: DNA analysis; Genetic: RNA analysis; Genetic: polymerase chain reaction; Genetic: polymorphism analysis; Genetic: reverse transcriptase-polymerase chain reaction; Other: enzyme-linked immunosorbent assay; Other: laboratory biomarker analysis; Other: questionnaire administration; Procedure: quality-of-life assessment
Sponsors: National Cancer Institute (NCI); National Surgical Adjuvant Breast and Bowel Project (NSABP); National Cancer Institute (NCI)
Recruiting - verified February 2012