PTPRD and neoplasm: This tumor also showed additional mutations such as amplification of TP63, SOX2, PIK3CA, FADD, CTTN, CCND1, EGFR, FGFR1, CASP8, SMAD4, TP53, NFE2L2, NOTCH1, 2,& 3, MYC, PTK2, AJUBA, TRAF3, ERBB2, NRAS, KRAS, HRAS, FAT1, KEAP1, E2F1, and SMAD2, loss of RASSF1, FHIT, CDKN2A, KMT2D, RB1, APC, CSMD1, PTPRD, MET, CUL3, and NSD1 and a LOH of TP53, NOTCH1, APC, RB1, CSMD1, PTPRD, CUL3, NSD1, CDKN2A, FHIT, and RASSF1, which have been reported in HNCSS (1, 13, 25).