PIK3CA and cancer: Thus, the functional networks most strongly affected in primary tumors included those involved in focal adhesion, PI3K-Akt and ErbB signaling and other cancer pathways, FcδR-mediated phagocytosis, endocytosis, bacterial invasion of epithelial cells, plus the TP53 signaling pathway, all of which have been previously shown to be directly involved in the development and progression of sCRC [25–29].