Hello Clare88, 

Welcome to Cancer Chat. I am sorry to hear that you best friend's father has been diagnosed with Grade 3/4 Thalamic Glioma. I think if the medical experts have recommended a biopsy, it's because they think it would be helpful and would help them determine the best course of treatment to follow in this specific case and whether for example radiotherapy would be suitable. This is obviously a difficult decision to take and I hope that your friend can get further guidance on this from the medical team who is looking after his/her father. Our nurses are also only a free phone call away if you want to talk things through with them. You can ring them on 0808 800 4040 (or give your friend their phone number) and their line is open Monday to Friday from 9am to 5pm. 

I hope your best friend is ok and if he or she ever wants to come and talk to others on Cancer Chat who have been affected by this type of cancer we are always here to listen. Hopefully you will hear from some of our other members who have been in a similar position before. 

Best wishes, 

Lucie, Cancer Chat Moderator