My husband was diagnosed with GBM in April of 2022. None of his two tumors were removed. We were told they would just grow back and that it was pointless to remove them. He was not offered the Optune device. We were never even told about that. I think it is a more recent thing. I have heard it does work somewhat. My husband passed away three months after he was diagnosed. It sounds like your husband is doing pretty well and I keep reading about people living longer with GBM. I wish you both the best.