PDGFA and glioblastoma: Since only PDGFRA has been identified as the receptor for PDGFA, we examined PDGFRA protein in a panel of glioma cells, including 2 primary GBM cells (091214 and 090116), 7 commercial GBM cell lines (A172, DBTRG-05MG, LN18, LN229, T98G, U251, and U87), and 1 commercial grade III glioma cell line (SW1088).