Abstract
FROM the study of the blood groups of patients with various articular diseases, Cohen et al.1 concluded that there was a significant correlation between the absence of the Rh antigen D and rheumatic disease. There also seemed to be a correlation with the absence of antigen N, while no correlation was found with the ABO blood group system. Their series consisted of 99 patients, 31 of whom suffered from rheumatoid arthritis, 31 from rheumatoid spondylitis, 15 from gout, 9 from disseminated lupus erythematosus, 6 from familial Mediterranean fever, and 7 from various other diseases. As the statistical analyses did not demonstrate any significant heterogeneity among the results obtained for the different diseases, the data were pooled.
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