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Blood, 21 May 2009, Vol. 113, No. 21, pp. 5064-5073. Prepublished online as a Blood First Edition Paper on March 11, 2009; DOI 10.1182/blood-2008-10-184168.
Submitted October 29, 2008
Genetic Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, MD, United States * Corresponding author; email: toroj{at}mail.nih.gov.
There have been no prior large population-based studies focusing on cutaneous lymphomas (CL) in the United States. Using the Surveillance, Epidemiology and End Results (SEER) program, we analyzed age-adjusted CL incidence rates (IR) and survival rates by gender and race/ethnicity. There were 3,884 CLs diagnosed during 2001-2005. Cutaneous T-cell lymphomas (CTCLs) accounted for 71% (IR=7.7/1,000,000 person-years), while cutaneous B-cell lymphomas (CBCLs) accounted for 29% (IR=3.1/1,000,000 person-years). Males had a significant higher IR of CL than females [14.0 vs. 8.2/1,000,000 person-years, respectively; M:F IRR 1.72; p<0.0001]. The M:F IRR ranged between 1.28-2.55 for the various CTCLs and CBCLs. Age-adjusted CL IRs were highest among Non-Hispanic Whites and Blacks (both 11.5/1,000,000 person-years), followed by Hispanic Whites (7.9) and Asian/Pacific Islanders (7.1). The CTCL IR was highest among Blacks (10.0/1,000,000 person-years), while the CBCL IR was highest among Non-Hispanic Whites (3.5). Over the last 25 years, the CL IR increased from 5.0/ 1,000,000 person-years during 1980-1982 to 14.3 during 2001-2003. Then, during 2004-2005 the CL IR was 12.7. Part of this recent apparent change, could be related to incomplete case ascertainment, or potential leveling off of IRs. CLs rates vary markedly by race, gender supporting the notion that they represent distinct disease entities.
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