metastatic clear cell renal carcinomaclear cell carcinoma kidney prognosisrenal cell carcinoma clear cell typeclear cell renalclear cell carcinoma symptomsclear cell renal cancertubulopapillary renal cell carcinomaconventional renal cell carcinomakidney cell carcinomaclear cell renal cell carcinomaclear cell carcinoma ovarynon small cell carcinoma