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Early detection of thick melanomas

CHICAGO Despite campaigns promoting early detection and increased awareness of melanoma (skin cancer) the proportion of the most aggressive and deadly form of melanoma remains the same, according to an article in the June issue of Archives of Dermatology, one of the JAMA/Archives journals.

Incidence and mortality of melanoma (skin cancer) in the United States have risen steeply from 1969 to 1999, according to background information in the article, with a disproportionally greater increase in men 65 years and older. Melanoma mortality (death) is strongly associated with the thickness of the primary lesion.

Marie-France Demierre, M.D., FRCPC, of Boston University School of Medicine, and colleagues analyzed data from the Surveillance, Epidemiology, and End Results (SEER) database to determine trends in distribution of thin and thick melanoma from 1988 to 1999. The researchers found that the number of new melanoma cases in a three year period increased 60 percent from 1988-1991 (n=9,132) to 1996-1999 (n= 14,575). The proportion of thick melanomas (at least two millimeters thick) remained relatively stable during the 12 study years. Nodular melanoma (NM, an aggressive type of melanoma) comprised nine percent of all recorded cases but 34 percent of the thick melanomas. In contrast, superficial spreading melanoma (a more common type of melanoma, that grows more horizontally in the skin) was almost uniformly diagnosed as an early tumor, mostly presenting as thin melanoma.

"A substantial number of thick melanomas in the United States are of the nodular subtype," the authors conclude. " apparently the current ABCD of melanoma, the core of the early-detection educational programs, may not suffice to permit the early detection of NM. For example, it is apparent that targeting middle-aged and older men is warranted. This observation has been supported by the Institute of Medicine, which conceded that 'clinicians and patients should continue to be alert
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Contact: Gina Digravio
617-638-8491
JAMA and Archives Journals
20-Jun-2005


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