[Study of the HLA system in rheumatoid arthritis].

A statistically significant, after correction of P value, increased incidence of the antigen HLA-DR4 chi 2 = 32.81, p less than 0.001, was established in the comparison of the antigen incidence of HLA-A, B, C and DR antigens in 59 patients with classical and positive rheumatoid arthritis and control healthy subjects. No essential difference in the distribution of DR4 was established that depended on sex, age of occurrence of the disease, presence of rheumatoid factor and the form of the disease.