deaths (OS)

la/mBC - HR-positive - 1st line (L1) breast cancer - HR positive la/mBC - HR positive la/mBC - HR-positive - 1st line (L1)

versus trastuzumab plus chemotherapy
trastuzumab plus endocrine therapy vs. trastuzumab plus chemotherapy 1 0.82 [0.65; 1.04], 1 RCT, I2=0%
inconclusive result

la/mBC - HR positive - L1 - PIK3CA mutant breast cancer - HR positive la/mBC - HR positive la/mBC - HR-positive - 1st line (L1) la/mBC - HR positive - L1 - PIK3CA mutant