Glioblastoma and its a primal tumor. The va wants to operate again otherwise they will stop chemo. He's already had 1operation and the removed 80%.

Your question is?? Gliobastoma (gbm) is a primary malignant tumor. Treatment is maximal safe removal, radiation and temodar (temozolomide). If there is recurrence, or failure of response to the radiation/chemotherapy, consider re-operation to remove more tumor. This would then be followed with a different type of chemotherapy. There are also now vaccine trials, and the use of the electric field device (now fda approved).
Follow advice. Unfortunately, is a bad tumor, recurrences are common, you have to follow your doctor's advice or if uncertain take a second opinion good luck.