title: MET expression in sporadic renal cell carcinomas.
abstract: Although germline mutations of met proto-oncogene on human chromosome 7q31-34 have been known as useful molecular markers of hereditary papillary renal cell carcinoma (RCC), the expression of MET, a product of met proto-oncogene, has not been fully studied in sporadic RCC, along with its clinical significance. We investigated the expression of MET by immunohistochemistry in 182 cases of renal neoplasm encompassing 145 RCC, 25 urothelial carcinomas of renal pelvis, and 12 oncocytomas. MET was diffusely and strongly expressed in 90% of papillary RCC, all collecting duct carcinomas, and 92% of urothelial carcinomas of renal pelvis. On the contrary, clear cell RCC, chromophobe RCC, and oncocytomas were negative or focally positive for MET expression. In clear cell RCC, MET expression was positively correlated with high nuclear grade, presence of infiltrative growth, tumoral necrosis, papillary architecture, sarcomatoid component, tumoral involvement of the renal pelvis or ureter, involvement of the calyx, and lymphatic invasion. In conclusion, diffuse and strong expression of MET in papillary RCC and collecting duct carcinoma might be helpful in discriminating from the other subtypes of RCC with tubular or papillary growth. In case of MET expression observed in clear cell RCC, it might correlate with those clinicopathological parameters implying aggressive behavior.
authors.affiliation: Department of Pathology, Cheil General Hospital, Samsung Medical Center, Sungkyunkwan University School of Medicine, Gangnam-gu, Seoul, Korea.
authors.forename: Jong Sun
authors.initials: JS
authors.lastname: Choi
authors.forename: Mi-Kyung
authors.initials: MK
authors.lastname: Kim
authors.forename: Jin Won
authors.initials: JW
authors.lastname: Seo
authors.forename: Yoon-La
authors.initials: YL
authors.lastname: Choi
authors.forename: Dong Hoon
authors.initials: DH
authors.lastname: Kim
authors.forename: Yi Kyeong
authors.initials: YK
authors.lastname: Chun
authors.forename: Young Hyeh
authors.initials: YH
authors.lastname: Ko
mesh_terms: D018249:Adenoma, Oxyphilic / Q000378:metabolism / Q000473:pathology; D002292:Carcinoma, Renal Cell / Q000378:metabolism / Q000473:pathology*; D006801:Humans; D007150:Immunohistochemistry; D007680:Kidney Neoplasms / Q000378:metabolism / Q000473:pathology*; D007682:Kidney Pelvis / Q000737:chemistry / Q000473:pathology; D009367:Neoplasm Staging; D000090063:Proto-Oncogene Mas; D011518:Proto-Oncogene Proteins / Q000096:biosynthesis*; D019859:Proto-Oncogene Proteins c-met; D017978:Receptors, Growth Factor / Q000096:biosynthesis*; D019459:Urothelium / Q000737:chemistry / Q000473:pathology
chemical_list: C000715470:MAS1 protein, human; D000090063:Proto-Oncogene Mas; D011518:Proto-Oncogene Proteins; D017978:Receptors, Growth Factor; C491743:MET protein, human; D019859:Proto-Oncogene Proteins c-met