PIK3CA and thyroid cancer: An analysis of PIK3CA somatic mutations and amplifications in thyroid cancers (Wu et al, 2005b) did not reveal any PIK3CA mutations; however, this group did find PIK3CA gene amplification in 12% of thyroid adenomas, 5% of papillary thyroid cancers, 24% of follicular thyroid cancers and 71% of thyroid cancer cell lines.