Japanese generalised osteoarthritis was associated with HLA class I--a study of HLA-A, B, Cw, DQ, DR in 72 patients.

To investigate the association between generalised osteoarthritis (GOA) and HLA-A, B, Cw, DQ and DR, we typed for HLA in 72 Japanese patients with GOA and compared with those of 1480 normal controls. The antigen frequency of HLA-Cw4 was significantly higher in the GOA group than in the control group. That of B62 was higher, but only uncorrected P values were significant. Those of HLA-Cw1 and Cw10 were significantly lower in the GOA group than in the control group. The antigen frequencies of HLA-DRB1*0101, *0401, *0405, *1001, and *1402, which were reported to be associated with rheumatoid arthritis, in the GOA group were not significantly different from those in the control group. The present study provides evidence of a significant association between Japanese GOA and HLA, which is different from that of Japanese RA. This may suggest that an immunological reaction that is different from RA plays a role in the pathogenesis of GOA.