NCAN and post-traumatic stress disorder: Similarly, both the NCAN and BCAN genes have been found to be differentially expressed in postmortem brains of patients with schizophrenia [35], and differential NCAN gene expression has been reported in PTSD in a blood-based sample [36], but NCAN and BCAN expression was non-significant in postmortem brain samples of PTSD patients [17, 19].