PIK3CA and cancer: A pathway analysis based on the somatic mutations and CNAs revealed an enrichment of genetic alterations targeting the canonical p53, PI3K/AKT/mTOR, Wnt, and Notch pathways, as defined by Sanchez‐Vega et al. [46], in both MBCs and UCSs (Fig. 3, Table S3); however, the target genes in these pathways varied according to the cancer type.