NRG1 and post-traumatic stress disorder: rs35753505 of NRG1 plays an important role in conferring susceptibility to the schizophrenia in a Pakistani population.20 Besides, alleles at the rs3924999 of the NRG1 gene increase the risk of schizophrenia.21 Therefore, we studied the rs35753505 and rs3924999 polymorphism of the NRG1 gene in the occurrence of PTSD in patients with HCC.