metformin
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['breast', 'cctg ma32']
#cctg @ #asco22
cctg ma32 poster session: metformin, placebo, and endocrine therapy discontinuation among participants in a randomized double-blind trial of metformin versus placebo in hormone receptor positive early-stage breast abstract link: 
The Canadian Cancer Trials Group is a cancer clinical trials research cooperative that runs phase I-III trials to test anti-cancer and supportive therapies.