PDGFRB and cancer: Immunohistochemistry data available at Human Protein Atlas (http://www.proteinatlas.org/) confirm that PDGFR-alpha expression is undetected in most cancers (http://www.proteinatlas.org/ENSG00000134853-PDGFRA/cancer) while PDGFR-beta is much more expressed (http://www.proteinatlas.org/ENSG00000113721-PDGFRB/cancer).