How To Treat Stage 4 Glioblastoma Tumor?

yes, my husband has glioblastoma tumor and has had the tumor removed. This was little over 1 year ago. The tumor has not began growing back. He had a very successful surgery, but the tumor was diagnoised a stage 4. His personality is different. We have a pretty large business and he is wanting to build another business in Denver. I m concerned about his ability to make decisions. He s still doing chemo and I m wondering if his personalilty will return when he s finished??