When comparing the HLA profiles of the patients with delusional
disorder with those of the patients with paranoid
schizophrenia, we observed a high incidence of the
HLA-A*03 allele in both patient groups (60% and 50%,
respectively). In addition, several other HLA genes, such as
A*11, and B*07, also showed relatively high values in both
groups. However, there was a marked difference in the frequency
of HLA-A*02 between the patient groups as well as
between patient and control groups.