PDGFRA and neoplasm: Only 2 tumours had high expression of PDGFRβ and PDGF-CC in combination with absent or low expression of PDGFRα (in both stromal and tumour cells), whereas 42 tumours had high expression of PDGFRα (in stromal and/or tumour cells) and PDGF-CC in combination with low PDGFRβ (Supplementary Table S1).