pCR rates by HER2 biomarker subgroups and PIK3CA status
TCH-P
As previously described, pCR was achieved in 123/221 (55.7%) patients in the TCH-P arm and 99/223 (44.4%) patients in the T-DM1 + P arm (absolute difference −11.3 percentage points, 95% CI −20.5 to −2.0; pCR ratesIn addition, mutated (vs. non-mutated) 