In this study, mutations in the genes ARID1A, APC, ERBB4, NCOR1, PDGFRA, ATM, and CDKN2A were either non-recurrent or of very low frequency, while none of the 14 sequenced EP tumours harboured mutations in the genes HRAS, EGFR, or RB1. The gene discussed is PDGFRA; the disease is neoplasm.