To investigate whether HT-EA regulates radiation-induced common targets (CXCR4, COX2) and other critical proteins (β-catenin, MMP9, Ki-67, NKX3.2, PhPT1, GRB10) that are instrumental in PC progression after therapy, we examined their alterations in PC cells that were selectively exposed to RT, with or without a daily dose of HT-EA. The gene discussed is PTGS2; the disease is pachyonychia congenita.