The tumor microenvironment (TME) plays a crucial role in glioblastoma progression, with recent studies highlighting the complex interactions between tumor cells and immune components. Kloosterman et al. demonstrated that macrophages facilitate the recycling of myelin-derived lipids to glioblastoma cells, which is essential for meeting the high metabolic demands of mesenchymal glioblastoma. This lipid transfer occurs via an LXR/Abca1-dependent mechanism, suggesting potential metabolic vulnerabilities that could be targeted therapeutically (ref: Kloosterman doi.org/10.1016/j.cell.2024.07.030/). In a contrasting finding, Dobersalske et al. revealed that cranioencephalic functional lymphoid units exist within the cranial bone marrow of glioblastoma patients, indicating that the immune landscape may be more active than previously thought, challenging the notion of a uniformly immunosuppressed TME (ref: Dobersalske doi.org/10.1038/s41591-024-03152-x/). Montoya et al. further explored the immune microenvironment, showing that reprogramming through interferon regulatory factor 8 can enhance antitumor immunity and reduce immunosuppression in murine models, highlighting the potential for immune modulation in glioblastoma therapy (ref: Montoya doi.org/10.1093/neuonc/). Overall, these studies underscore the dynamic interplay between glioblastoma cells and the immune system, suggesting that targeting metabolic pathways and enhancing immune responses could be promising strategies for improving patient outcomes.