Background and objectiveBoth basal cell carcinoma (BBC) and squamous cell carcinoma (SCC) are the commonly malignant tumors of skin and their carcinogenesis is a complex process involving many factors, which has not been well understood so far.

• 背景和目的 皮肤基底细胞癌(basal cell carcinoma，BCC)和鳞状细胞癌(squamous cell carcinoma，SCC)是常见的皮肤恶性肿瘤。