Conversation: The conversation between human and AI assistant.
[|Human|] My boyfriend has sarcoma cancer.  Tumor is wrapped around aorta and has spreak to spine.  Legs are weak.  Doctors stated he could go paralyzed in 6 months.  They are doing surgery tomorrow and stated there is a 50% chance he could die?  Is this true?  Is this a risky surgery?
[|AI|]  Thanks for your question on Chat Doctor. I can understand your concern. Yes, this surgery is very risky and chances of death on operation table is highly, roughly 50-60%. This is because of the location of tumor. When tumor is around major blood vessel like aorta, chances of bleeding are more. So sudden massive bleeding during surgery can happen, and it can cause death of patient. So this surgery is definitely very risky. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.