title: Cancer-to-cancer metastasis.
abstract: The development of another separate primary cancer in a patient with 1 malignant tumor is not uncommon but metastasis of a malignant donor tumor to a different host tumor is extremely rare. Most recipient tumors have been primary renal cell carcinomas. We report a case of metastasis of a malignant melanoma to a renal cell carcinoma.
mesh_terms: D000230:Adenocarcinoma / Q000473:pathology*; D000368:Aged; D001005:Anus Neoplasms; D005260:Female; D006801:Humans; D007680:Kidney Neoplasms / Q000473:pathology* / Q000556:secondary; D008545:Melanoma / Q000473:pathology / Q000556:secondary*; D009378:Neoplasms, Multiple Primary / Q000473:pathology*