For colorectal carcinoma, the prevalence of PIK3CA mutation was reported to be between 7% and 32%, with G>A transversions in exon 9 being the most commonly observed configuration [4], [8], [9], [10], [11], [12], [13], [14], [15], [16], [17], [18], [19], [20], [21]. The gene discussed is PIK3CA; the disease is colorectal carcinoma.