例1　男,50岁。1989年11月因慢性肾炎、尿毒症行同种肾移植术。术后常规应用免疫抑制剂环孢素A、硫唑嘌呤和强的松。1993年8月发现左颊部皮肤上长一绿豆大小疣状肿物,未予治疗。1993年12月来诊时肿物已长至3cm×3cm。肿物暗红色,表面干燥,基底坚硬。病理活检报告为皮肤鳞癌。行 Example 1 male, 50 years old. 1989 November due to chronic nephritis, uremia allograft kidney transplantation. Postoperative immunosuppressive agents cyclosporine A, azathioprine and prednisone. August 1993 found a long vermiform verrucous mass on the left cheek skin, untreated. 1993 December when the tumor to the clinic has grown to 3cm × 3cm. Dark red mass, dry surface, hard substrate. Pathological biopsy was reported for squamous cell carcinoma. Row