TGFB1 and glioblastoma: Our results are consistent with and expand the impact of prior reports that showed systemic treatment with monoclonal antibodies that target TGFβ ligands or the type II TGFβ receptor inhibit metastatic invasion of breast cancer cells in the 4T1 model [38–39], and previous reports on the impact of systemic treatment with small molecule inhibitors of TGFβ on in vivo xenograft and murine models of metastatic pancreatic cancer and glioblastoma [16–18, 40].