Background and purpose: Malignant melanoma has become one of the most rapidly increasing malignant diseases in China. Sentinel lymph node biopsy(SLNB) was conducted as a standard surgical procedure for cutaneous melanoma in Western world but not in China nowadays. Compared with those in Western country, Chinese melanomas are characterized by the presence of more acral lesions, thick invasion and high prevalence of ulceration with a poor prognosis. Prognosis of Chinese melanoma after surgery remains unclear....