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No available tumor tissues for genetic testing (archived tissue sampling more than 5 years from screening date)\n3. Undesirable compliance (Mental status is not fit for further treatment or data collection.)",true,"ALL","18 Years",{"count":224,"type":225},250,"ESTIMATED","OBSERVATIONAL","Cutaneous melanoma is the most aggressive malignancy in skin cancers. Cutaneous melanoma is a rare disease in Taiwan with an incidence rate of around 1\u002F100,000. Acral lentiginous melanoma is the most common subtype and comprises more than half of cutaneous melanoma in Asia including Taiwan but only 1% in Caucasians. In addition, mucosal melanoma accounts for more than 20% of malignancy melanoma in Taiwan but only 1% in Caucasians. Acral and mucosal melanomas have distinct epidemiological, clinical, pathological and genetic features from non-acral melanoma which is commonly seen in Western countries. 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