COMT and post-traumatic stress disorder: Catechol‐O‐methyltransferase (COMT) is one of the candidate genes associated with suicide (Baud et al., 2007; Broekman, Olff, & Boer, 2007; Kia‐Keating, Glatt, & Tsuang, 2007; Nedic et al., 2011) and reported as a risk factor for PTSD (Valente et al., 2011).