PIK3CA and mucinous neoplasm: These include: FH, GMPS, PIK3CA, EIF4A2, ZNF384, and SS18L1 (amplifications in serous tumors); TET2, FGFR10P, NF1, ERBB2, and SH3GL1 (deletions in serous tumors) and ERBB2 (amplifications in mucinous tumors).