Interestingly, chromophil renal cell tumors predominate (82%) in patients with
chronic renal insufficiency (hemodialysis).
The distribution of the types differs with respect to tumor size. In autopsy and
surgical series, more than 95% of renal epithelial tumors smaller than 10 mm in
diameter are of the chromophil cell type. The incidence drops to a little bit less
than 10% in the size group 5 -10 cm diameter, while the incidence of clear cell
tumors rises to nearly 80%.