Melanoma on scalp, neck most deadly, study finds

By Will Dunham

WASHINGTON (Reuters) - Melanoma, the most dangerous form of skin cancer, is much deadlier when it appears on the scalp or neck than somewhere else on the body, according to a study published on Monday.

People with scalp or neck melanomas died at nearly twice the rate of those with melanoma elsewhere on the body, the researchers at the University of North Carolina at Chapel Hill found. People with melanomas on the arms, legs, face or ears were found to have the best prognosis.

They analyzed data on 51,704 people diagnosed with melanoma in the United States from 1992 to 2003, and found that survival rates varied depended on where on the body it first appeared.

"Melanoma is a skin cancer that is derived from the pigment cells in the skin. It's the most deadly type of skin cancer. It can metastasize (spread to other parts of the body) early when the lesions are still quite small," Dr. Nancy Thomas of the UNC School of Medicine and Lineberger Comprehensive Cancer Center, said in a telephone interview.

Thomas said part of the reason for the deadliness of melanoma on the scalp and neck may be that diagnosis may be delayed because it can be obscured by hair on the scalp.

But that probably is not the only explanation -- and these melanomas for a variety of reasons may be more aggressive than those appearing somewhere, Thomas said. For example, these people are more likely to have cancer that spreads to the brain than those with melanoma on their arms, legs or trunk.

The study placed the five-year survival rate for people with scalp or neck melanomas at 83 percent, compared with 92 percent for those with melanomas elsewhere on the body. The 10-year survival rate for people with scalp or neck melanomas was 76 percent, compared to 89 percent for other melanomas.

"This finding has implications for screening and public health recommendations, and we urge physicians, physician assistants, nurses and nurse practitioners to examine the scalp/neck carefully during routine skin examinations," the researchers wrote in the journal Archives of Dermatology.