HLA-C and post-traumatic stress disorder: It is also worth noting that PTSD has also been found to be associated with HLA alleles (HLA-B*5801, HLA-C*0701, HLA-DQA1*0101, HLA-DQB1*0501, and HLA-DPB1*1701) in a case-control study of 403 diagnosed patients with 369 individuals who had been exposed to trauma (Katrinli et al., 2019).