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This is still preliminary work, but raises an important point: that we should recheck everything that we thought we knew about these tumors. The technology we have now is amazing compared to what was available in the 1950s when it was decided that brain tumors use glucose as the main energy source. This article points out that by culturing the tumor cells in blood, you change the tumor cells to use what is most common in the blood, which is different than what is in the brain. On the other hand, they also mention that PET scans show where glucose is being used - and the tumors do use a lot more glucose than non tumor brain.