Forty-one (8%) of primary tumours displayed a high expression of both PDGFRα in tumour cells and PDGF-CC, 63 (13%) of PDGFRα in stromal cells and PDGF-CC, and 36 (7%) of PDGFRβ in stromal cells and PDGF-CC. This evidence concerns the gene PDGFRA and neoplasm.