Study study type PathologyT1T0Patientssample sizesROB Results deaths (OS) Eprogression or deaths (PFS) ERFS/DFS E

la/mBC - HR-positive - 2nd line (L2) breast cancer - HR positive la/mBC - HR positive la/mBC - HR-positive - 2nd line (L2)

versus placebo
metformin
Pimentel, 2019
  NCT01310231
RCTla/mBC - HR-positive - 2nd line (L2)metformin plus chemotherapyplacebo plus chemotherapyWomen with metastatic or unresectable locally advanced BC, about to receive 1st to 4th line, any HR or HER2 status22 / 18NA
inconclusive 20%