CD47 and renal cell carcinoma: In our study, it was found that 6 out of 24 chromophobe RCC cases with CD47 staining, 5 out of 7 papillary type 2 RCC cases, all 3 clear cell RCC cases, and 14 out of 18 unclassified RCC cases died within a follow-up period of less than 5 years.