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© 1992 British Society for Rheumatology

brief-report

COMPLEMENT C4 NULL ALLELES AS A MARKER OF GOLD OR D-PENICILLAMINE TOXICITY IN THE TREATMENT OF RHEUMATOID ARTHRITIS

R. W. E. CLARKSON, P. A. SANDERS and D. M. GRENNAN

University of Manchester, Rheumatic Diseases Centre, Hope Hospital Eccles Old Road, Salford M6 8HD

Correspondence to: Correspondence to Dr D. Grennan

C4 null alleles and HLA-DR antigens were defined in 48 rheumatoid arthritis (RA) subjects who had developed renal or haematological side effects to gold or penicillamine, as compared to 33 RA subjects who had received the drugs for similar time periods without developing side effects. A C4A null allele was found in 56% of subjects with and 31% of those with out side effects (P = 0.027, relative risk 2.8). A similar but statistically non-significant trend was observed with the C4B null allele (P = 0.64) resulting in a higher risk of drug toxicity in rheumatoid patients bearing either a C4A or C4B null allele (relative risk 5.7). Frequencies of DR3 and DR4 were similar in the two groups.

KEY WORDS: HLA, Complement C4


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