PDGFRB and neoplasm: Regarding tumor nests, 57% (37/65) of cases were CDCP1-positive, 45% (29/65) was PDGFRβ-positive, 32% (21/65) was positive for CDCP1 and PDGFRβ (double-positive), and 31% (20/65) was negative for CDCP1 and PDGFRβ (double-negative).