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© 1989 British Society for Rheumatology

brief-report

PHOTOSENSITIVITY AND ANTI-RO (SS-A) ANTIBODIES IN BLACK PATIENTS WITH SYSTEMIC LUPUS ERYTHEMATOSUS (SLE)

P. G. SUTEJ*,, A. J. GEAR, R. C. A. MORRISON, M. TIKLY, M. DE BEER, L. DOS SANTOS and R. SHER

Departments of Rheumatology and Immunology, University of the Witwatersrand 7 York Road, Parktown, 2193, South Africa Institute for Biostatistics of the South African Research Council

Correspondence to: Correspondence to Dr. Sutej

Ninety-two patients with SLE, 36 black and 56 white, were studied prospectively for photosensitivity and anti-Ro (SS-A) and anti-La (SS-B) antibodies. Photosensitivity was found in 19% of black patients, compared to 71% of white patients (p = 0.001). Anti-Ro antibodies were found in 69% of black and 54% of white patients (p = 0.013). Photosensitivity was present in 87% of Ro-positive white patients and in 54% of Ro-negative white patients (p = 0.07). However, in black patients with SLE there was a strong negative association: 4% of Ro-positive patients were photosensitive while 55% of Ro-negatives were photosensitive (p = 0.001). This suggests that black SLE patients may possess a factor which ‘blocks’ photosensitivity, perhaps by preventing local tissue damage caused by the interaction of Ro antibodies and ultraviolet light.

KEY WORDS: Race, Pigmentation, Anti-Ro, Anti-La, Ultraviolet light

*Current address: The University of North Carolina at Chapel Hill, 932 Faculty Laboratory Office Building 231H, Chapel Hill, NC 27514, USA.


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