TITLE

Pathologic and Clinical Features Influencing Outcome of Thin Cutaneous Melanoma: Correlation with Newly Proposed Staging System

AUTHOR(S)
Finley, J. William; Gibbs, John F.; Rodrigues, Luz M.; Letourneau, Richard; Driscoll, Deborah; Kraybill, William
PUB. DATE
June 2000
SOURCE
American Surgeon;Jun2000, Vol. 66 Issue 6, p527
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The incidence of malignant melanoma is increasing. Because of increased awareness, early recognition of malignant melanoma has become more common. In 1997, a new staging system for cutaneous melanoma was proposed, with reclassification of thin melanoma < 1 mm, with and without ulceration. This report evaluates the pathologic and clinical features of thin melanomas influencing recurrence and survival from a tertiary cancer center in an attempt to correlate findings with the proposed staging system. A review of the Roswell Park Cancer Institute tumor registry identified 352 patients with thin cutaneous melanomas (< 1.0 mm) seen during an 18-year period ending August 30, 1998. Overall survival was 93 and 87 per cent at 5 and 10 years, respectively. Disease-free survival was 94 and 93 per cent at 5 and 10 years, respectively. Local recurrence occurred in 3 per cent of patients, regional recurrence in 3 per cent, and metastatic disease in 3 per cent, for an overall recurrence of 7 per cent, with a median follow-up of 118 months. Only the presence of ulceration was a significant prognostic factor for recurrence by both univariate and multivariate analysis. Failure rates (any recurrence) by Clark levels I, II, and III/IV were 3, 5, and 10 per cent, respectively (P = 0.14). Failure rates by tumor thickness (mm), for 0.0--0.24, 0.25--0.49, 0.50-0.74, and 0.75-0.99 were 3, 4, 7, and 10 per cent, respectively (P = 0.49). Ten-year disease-free survival for ulceration versus no ulceration was 40 and 94 per cent, respectively (P < 0.0001). We conclude that thin cutaneous melanoma carries an excellent prognosis with appropriate treatment. Our findings support inclusion of ulceration in a new staging system. Lesions 0.76 to 0.99 mm and Clark level III and IV may warrant close observation as a separate subgroup.
ACCESSION #
3214574

 

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