title: [Renal cell carcinoma with colon metastases: an infrequent site for metastases].
abstract: BACKGROUND
  Renal cell carcinoma (RCC) represents approximately 3% of malignant tumors in adults and occurs in a M:F ratio of 1.5:1.0. Although in most cases it occurs in persons 50 to 70 years of age, there are also reports in children. Clear cell carcinoma is the most frequent histological type, and 30% of renal carcinomas have metastasized at the time of diagnosis. The objective of the present study is to report colon metastasis of clear cell carcinoma that required surgery and chemotherapy.
  
  
  METHODS
  We report the case of a 60-year-old male with a history of metastatic RCC. His treatment consisted of cytoreductive radical nephrectomy and interferon because of pulmonary disease. He was followed-up for 8 years. Nevertheless, he presented with hematochezia and underwent colonoscopy where a splenic flexure tumor was demonstrated. Biopsy reported a clear cell tumor. We performed a left hemicolectomy. Pathology report was clear cell carcinoma with involvement of the colon from the mucosa to serosa. The patient again received interferon. Currently, there is no evidence of tumor activity and the patient is being followed-up.
  
  
  CONCLUSIONS
  RCC metastases are most frequent in lung, liver, and bone and less frequent in brain, skin, and soft tissue. Metachromic metastases are identified in the first to second year after nephrectomy in most cases. Survival of patients who present metastasis <1 year after nephrectomy is 33 months vs. patients who present metastasis after 1 year from nephrectomy (55 months). Metastatic clear cell carcinoma requires surgery and immunotherapy. Surgery is the first step for disease control and metastatecomies are indicated in localized disease or when one organ is affected and surgically accessible.
authors.affiliation: Hospital General de Zona 1, Instituto Mexicano del Seguro Social, Campeche, Campeche. edvaldespinocg@yahoo.com
authors.forename: Víctor Edmundo
authors.initials: VE
authors.lastname: Valdespino-Castillo
authors.forename: Alejandro
authors.initials: A
authors.lastname: Ruiz-Jaime
mesh_terms: D018262:Adenocarcinoma, Clear Cell / Q000188:drug therapy / Q000556:secondary* / Q000601:surgery; D000970:Antineoplastic Agents / Q000627:therapeutic use; D002292:Carcinoma, Renal Cell / Q000150:complications / Q000188:drug therapy / Q000556:secondary* / Q000601:surgery; D003082:Colectomy / Q000379:methods; D003110:Colonic Neoplasms / Q000150:complications / Q000188:drug therapy / Q000556:secondary* / Q000601:surgery; D003131:Combined Modality Therapy; D005500:Follow-Up Studies; D006471:Gastrointestinal Hemorrhage / Q000209:etiology; D006801:Humans; D007167:Immunotherapy; D016898:Interferon-alpha / Q000627:therapeutic use; D007680:Kidney Neoplasms / Q000188:drug therapy / Q000473:pathology* / Q000601:surgery; D008175:Lung Neoplasms / Q000556:secondary; D008297:Male; D008875:Middle Aged; D009392:Nephrectomy / Q000379:methods; D012074:Remission Induction
chemical_list: D000970:Antineoplastic Agents; D016898:Interferon-alpha