This showed a significant association between increasing expression of both PDGFRα and PDGFRβ, and increasing PDGF-CC levels (P < 0.001 for tumour and stromal cell PDGFRα expression, P = 0.004 for stromal cell PDGFRβ expression, Supplementary Fig. S1a–c). The gene discussed is PDGFRB; the disease is neoplasm.