PDGFRA and renal carcinoma: Platelet-derived growth factor receptor alpha expression (62.9 ± 8.4 HS) was observed in the cytoplasm and on the membrane of 58.5% of primary renal carcinoma cells, while PDGFRβ expression was lower, found in 44.6% of samples (26.6 ± 5.3 HS), though this difference was not statistically significant (P > .05).