Tumor to Tumor Metastasis.

Describes the carcinoma of the of the uterine cervix metastasizing to a renal cell carcinoma and a urothelial carcinoma of the urinary bladder metastasizing to a solitary fibrous tumor of the pleura. Reports of two cases and review of literature; Reported cases of tumor-to-tumor metastases; Prognostic markers and mechanisms of metastasis; Biological and clinical aspects of cancer metastasis.