In our study, metastasis was detected in 6 out of 24 chromophobe RCC patients with CD47 staining, in 1 out of 7 patients with papillary type 2 RCC, in 2 out of 3 patients with clear cell RCC, and in 16 out of 18 unclassified RCC cases. The gene discussed is CD47; the disease is renal cell carcinoma.