[Skin metastases of internal cancers. A critical review of the literature].

The value of global statistical data on skin metastases of internal carcinomas is a relative one, since skin metastases are frequently seen in carcinomas of the breast, but rarely found in other internal cancer. Nevertheless, the study of skin metastases is important, because they may help to identify and locate an occult carcinoma; moreover they can serve as a parameter to appreciate the efficiency of polychemotherapy.