The authors examined 29 patients with endogenous psychosis (incl. 25 suffering from paranoid schizophrenia and four suffering from bipolar psychosis diagnosed according to DSM III criteria) with the aim to reveal the relationship of hitherto little studied HLA-DR antigens and the psychotic disease. Moreover, the passesed in the group also the ration of HLA-A, B, C antigens. In patients with paranoid schizophrenia and in all patients they found a higher incidence of HLA-DR2 antigens and a lower incidence of HLA-DRw6 and DR7. A statistically significant result was obtained only for HLA-DR2, and only before correction of p. The corrected p value (for the number of antigens) was no longer significant. This finding may serve as a stimulus to resolve the relationship of HLA-DR antigens and schizophrenia in a larger number of patients and in a greater number of departments.