CXCL12 and glioblastoma: However, the conditioned medium collected from UCB‐MSCs did not affect GBM cell growth, suggesting a role for a direct interaction among cells, while that from AT‐MSCs supported the proliferation of GBM cells, being the cells enriched in the mRNAs controlling angiogenic factors (VEGF, angiopoietin 1, PDGF, IGF‐1, and CXCL12).