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We reviewed the charts of 393 consecutive patients referred to the Toronto-Bayview Regional Cancer Centre and the Ontario Cancer Institute between January 1, 1978, and December 31, 1982, with clinical stage I malignant melanoma to determine the predictive value of routine staging investigations. The investigations reviewed included physical examination, liver function tests, radionuclide liver-spleen and bone scans, chest x-ray, whole-lung tomograms, CT chest scans, CT brain scans, and bipedal lymphangiograms. The clinical stage of nine patients was changed, eight as a result of physical examination and one as a result of lymphangiogram. No other investigations detected metastatic melanoma at referral. We recommend that staging investigations for patients referred with clinical stage I malignant melanoma be restricted to a complete physical examination and a baseline chest x-ray for all patients.