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Invasive melanoma may be more likely in children than adults
Date:10/5/2011

A Johns Hopkins Children's Center study of young people with melanoma, a deadly form of skin cancer, has found that some children have a higher risk of invasive disease than adults.

The study, published online Oct. 5 in the journal Cancer, is believed to be the first to compare disease spread in children and adults, and the results suggest some profound biological differences between childhood and adult melanoma, the researchers say.

The Johns Hopkins team analyzed five years of medical records tracking 717 children and 1,368 young adults (ages 20 through 24) diagnosed with melanoma. They compared tests results from lymph node biopsies based on tumor size, tumor appearance and age. The researchers found that children with melanoma were, overall, more likely than adults with the disease to have metastases in the lymph nodes surrounding the tumor, known as sentinel lymph nodes. Sentinel lymph node biopsy -- the standard way to gauge spread of the disease and determine treatment -- involves removal of one or two nodes closest to the tumor. Current guidelines, based on adults with melanoma, call for node removal in all patients with irritated or bleeding melanomas or those thick enough -- 1 millimeter (roughly 0.04 inches) or more -- to suggest that cancer cells have penetrated the skin deeply and may have broken away from their original site.

Cancer cells were found in the sentinel lymph nodes of 25 percent of children and 14 percent of adults who had biopsies. Tumor thickness was the strongest predictor of lymph node metastases in both groups, the researchers found, but children with tumors ranging between 1.01 and 2 millimeters emerged as a particularly high-risk group. They were nearly six times as likely as young adults with same-thickness tumors to have cancer cells in nearby lymph nodes. Children under 10 years of age were more likely to have metastases beyond the immediate tumor site, or distant metastases, and greate
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Contact: Ekaterina Pesheva
epeshev1@jhmi.edu
410-502-9433
Johns Hopkins Medical Institutions
Source:Eurekalert

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