We read with great interest the article by Liu et al1 and the accompanying editorial by Lipsker2 on rapidly growing melanomas. Both articles point out that different types of melanomas exist in relation to their biological propensity to grow and metastasize. Based on patient recall, Liu et al1 calculated the rate of growth of 404 invasive melanomas (median tumor thickness, 1.3 mm) and found that almost a third of them grew 0.5 mm per month or more. These rapidly growing melanomas are more likely thick tumors associated with a high mitotic rate and more frequently found in older men with fewer melanocytic nevi and freckles. Furthermore, they usually lack the clinical ABCD features of melanoma (A, asymmetry; B, border irregularity; C, color variegation; D, diameter >5 mm), being frequently symmetric and amelanotic nodules. The authors conclude that the lack of the most important risk factors for melanoma (ie, large number of nevi and freckles) and the lack of the typical melanoma features (ie, ABCD criteria) make it more difficult for the physician to identify this subtype of rapidly growing melanoma.
Argenziano G, Zalaudek I, Ferrara G. Fast-Growing and Slow-Growing Melanomas. Arch Dermatol. 2007;143(6):799–816. doi:10.1001/archderm.143.6.802
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