PIK3CA and breast carcinoma: Compared with those in the MSKCC cohort, the frequencies of well‐known PIK3CA driven mutations in our cohort were higher for p.H1047R (44% vs. 38%) and lower for p.E545K (7% vs. 22%), p.E542K (2% vs. 14%), and p.N345K (4% vs. 8%), which were consistent with the findings of Liao et al in anther Chinese breast cancer cohort30 (Figure S3A).