M. Lippmann, M.D.; H. L. Eckert, M.D., F.A.C.P.; N. Hahon, Sc.M.; W. K. C. Morgan, M.D., F.A.C.P.
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Serums from 156 underground coal miners were examined for rheumatoid factor and antinuclear antibody. Serums from 51 underground and surface miners with normal X rays served as controls. A relation between humoral autoimmune activity and the radiographic type of nodular opacity was sought. The serums were divided into four groups, according to the miner's chest X ray: (1) complicated pneumoconiosis (progressive massive fibrosis), (2) simple pneumoconiosis, (3) normal, and (4) features suggestive of Caplan's syndrome. Group 4 was divided into three subgroups (4a, b, and c) : those with classical factors of Caplan's syndrome, those whose X rays were suggestive
Lippmann M, Eckert HL, Hahon N, et al. The Prevalence of Circulating Anti-Nuclear and Rheumatoid Factors in United States Coal Miners.. Ann Intern Med. 1973;78:833. doi: https://doi.org/10.7326/0003-4819-78-5-833_1
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Published: Ann Intern Med. 1973;78(5):833.
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