Not CAR-T or CRISPR AFAIK, but there's been some recent breakthroughs with getting treatments past the blood brain barrier, and promising glioblastoma treatments are in the pipeline as well. This is just what I've seen on the internet news, you'd find more than I know about it with some internet searches.

I hope you aren't affected by GBM. If you are, or someone you know is, my only advice is to live life to the fullest while you can and don't let yourself fall into denial of the prognosis.