PDGFRB and neoplasm: Stromal cells consisted of five subtypes denoted as S1 to S5 for Collagen+, FAP+, PDGFRb+, SMA+, and Vimentin+ cells, respectively, and tumor cells included 4 subtypes denoted as T1 to T4 for CAIX+, Ki67+, VEGF+, and a non-classified subtype (n.c.)that did not show the elevated expression on any markers from the defined panel, respectively.