PIK3CA and neoplasm: Comparable mutations were found in the peritoneum tumor localization: PIK3CA exon 2 mutation (c.263G>A) and exon 21 mutation (c c.3129G>T) with an allelic ratio of 32% and 39%, respectively; cKIT exon 8 mutation (c.1264G>A) with an allelic ratio of 34%.