OUTLINE: This is a randomized study. Patients are stratified by pathologic lymph node status (known vs unknown),lymph node staging procedures(sentinel lymph node procedure vs. elective lymph node dissection vs. no lymphadenectomy), Breslow depth (<= 1.0 mm vs. 1.01-2.0 mm vs. 2.01-4.0 mm vs > 4.0 mm), ulceration of the primary lesion (yes vs. no vs. unknown), and disease stage (lymph node positive [N1, N2a] vs. lymph node negative [N0]). Patients are randomized into one of two treatment arms in a 1:1 ratio.