They further discovered that these FAP+/PDGFRβ+ cells participated in TGFβ secretion in GBM, which is consistent with previous studies showing that GBM-activated pericytes secrete high levels of immunosuppressive cytokines, including IL-10 and TGFβ, and promote tumor growth [22,23]. The gene discussed is PDGFRB; the disease is glioblastoma.