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Psoriasis may increase risk for certain cancers

CHICAGO Patients with the skin disease psoriasis may be at an increased risk for developing lymphoma, according to an article in the November issue of The Archives of Dermatology, one of the JAMA/Archives journals.

Psoriasis is a common skin disease characterized by patches of thickened, red and scaly skin, usually on the torso or arms, and can be painful and disfiguring in some cases. According to the article, psoriasis affects about 1 percent to 2 percent of the population. Previous research has shown that people with psoriasis may be at an increased risk for developing lymphoma a group of cancers affecting the lymph tissues found mainly in the lymph nodes and spleen.

Joel M. Gelfand, M.D., of the University of Pennsylvania, Philadelphia, and colleagues investigated whether the rate of lymphoma in patients with a history of psoriasis is different from the rate of lymphoma in patients without psoriasis.

The researchers studied a random sample of 10 percent of patients 65 years or older (2,718 patients with psoriasis; 105,203 without) who were registered with a general practitioner who contributed to the General Practice Research Database (GPRD) between 1988 and 1996. The GPRD was established in the United Kingdom in 1987 and is a medical record database that holds data on more than 8 million patients including information on diagnoses and medications. The median follow-up time for the patients was 46 months (the median is the middle value; half the patients follow-up times were longer than 46 months, half were shorter than 46 months).

During the study period, the authors identified 276 lymphomas. "Patients with psoriasis had an almost 3-fold increased rate of lymphoma compared with patients without psoriasis," the authors write. "Patients 65 years or older who had psoriasis developed an additional 122 lymphomas per 100,000 patients annually."

After reviewing the medical records of patients with psoriasis who had l
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Contact: Susan Winston
215-349-8368
JAMA and Archives Journals
17-Nov-2003


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