Sarcomatoid renal cell carcinoma is not a distinct histologic entity and represents high-grade
transformation in different subtypes of renal cell carcinoma. It is not known whether any
particular histologic type has a predilection for sarcomatoid change or whether the primary
histologic type of renal carcinoma undergoing sarcomatoid change affects prognosis. Of 952
consecutively histologically subtyped renal cell carcinomas, the incidence of sarcomatoid
differentiation was 8% in conventional (clear cell) renal carcinoma, 3% in papillary renal …