Cutaneous squamous cell carcinoma and other cutaneous carcinomas.

Precancerous lesions and cutaneous carcinomas.

Clinical diagnostic features are lifelong eruptions of pityriasis versicolor-like macules, flat wart-like papules and development of cutaneous carcinomas.

Patients with primary cutaneous squamous cell carcinoma or other cutaneous carcinomas with no evidence (clinical, radiologic, or pathologic) of regional or distant metastases are divided into the following two stages: