PIK3CA and neoplasm: The co-occurring mutation gene pairs with high SCORE-CO were tumor type-specific, e.g., gene pairs of TP53 and PIK3CA were highly ranked in BLCA, BRCA, COADREAD, HNSC, LUSC, UCEC (SCORE-CO = 0.089 for 8 cases with the co-occurrence / total 90 patients, 0.055 for 40 cases, 0.085 for 21 cases, 0.083 for 22 cases, 0.085 for 10 cases, 0.106 for 18 cases, respectively) and to a lesser extent in LUAD (SCORE-CO =0.024 for 7 cases).