PDGFRB and neoplasm: Overall, PDGFRα was expressed in the malignant cell component of the sample in 15 (41.6%) of cases, 3 of them (8.3%) showed positive reaction in tumor cells as well as in stroma; and in 2 cases (5.5%) only in the stroma Regarding the PDGFRβ, 19 samples (52.7%) expressed the receptor in the tumor component, 13 out of the 19 samples showed signal in tumor and stroma; 4 cases (11.1%) were positive only in the stroma.