PIK3CA and neoplasm: The subgroups with mutated-PIK3CA tumors and wild-type PIK3CA tumors and the subgroups with mutated-KRAS tumors and wild-type KRAS tumors were similar according to the baseline characteristics (mean age at diagnosis, sex, tumor location, stage of disease, tumor grading, and aspirin use before diagnosis; p > 0.1 for all comparisons).