Association between psoriasis and incident cancer: The Iowa's Women's Health Study

Division of Epidemiology and Community Health, University of Minnesota, 1300 2nd Street South, Suite 300, Minneapolis, MN 55455, USA.
Cancer Causes and Control (Impact Factor: 2.74). 07/2011; 22(7):1003-10. DOI: 10.1007/s10552-011-9773-0
Source: PubMed


Studies have reported higher cancer risk in individuals with psoriasis, a chronic inflammatory autoimmune disease; however, adjustment for potential confounders was lacking.
We examined the association of psoriasis with cancer incidence in 32,910 women after age 65 in the IWHS cohort linked to Medicare. Psoriasis was defined as: 2+ psoriasis claims from any Medicare file during 1991-2004 or 1+ psoriasis claim from a dermatologist (n = 719). Severe psoriasis was defined as 4+ psoriasis claims from a dermatologist in any year (n = 121). Cox proportional hazards regression, with psoriasis as a time-dependent variable was conducted to calculate hazard ratios (HR) and 95% confidence intervals (CI) of total (n = 6,488), breast (n = 2,066), lung (n = 742), and colon cancers (n = 947).
With age-adjustment, psoriasis (yes vs. no) was associated with increased risk of lung 1.9 (95% CI: 1.2-3.0), colon 1.6 (95% CI: 1.1-2.5), and total cancer 1.2 (95% CI, 1.0-1.4). After further adjustment for smoking, body mass index, education, physical activity, and hormone therapy use, only the association for colon cancer remained statistically significant (HR = 1.6, 95% CI: 1.0-2.4) and was stronger for severe psoriasis.
The observed association between psoriasis and colon cancer may reflect inflammatory or unidentified processes.

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Available from: Anna E Prizment, Oct 10, 2015
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    • "The Iowa Women’s Health Study, which included more than 32,000 women, found a significant association only between colon cancer and psoriasis when disease incidence was adjusted for smoking, body mass index, education, physical therapy, and use of hormone therapy [47]. Other studies suggest an increased risk for cancer of the bladder, kidney, oropharynx/larynx, esophagus, stomach, liver/gallbladder, vulva, breast, and pancreas and for leukemia, non-Hodgkin’s lymphoma, and NMSC [48-55]; however, these studies did not control for environmental factors such as alcohol and smoking. "
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