<prompt> The most common variant of RCC isClear cellPapillaryChromophobeCollecting duct  <response>: Types of renal cell carcinomaFrequency1.Clear cell carcinoma2.Papillary renal cell carcinoma3.Chromophobe renal cell carcinoma4.Collecting duct carcinoma70-8010-1551 Ref: Robbins 8e p965 