You have asked me a straight forward question and i will give you an honest and straight forward answer.
Without knowing exactly the type of tumour, from what you have described and the grading, it is almost certainly a type of astracytoma.
This is a highly malignant and aggressive tumour and the treatment is surgery followed by radiotherapy.
Few patients survive 8 months with OR without treatment.
That's it daftgrandad..........sorry.