Conversation: The conversation between human and AI assistant.
[|Human|] my son has advanced stage 4 colon cancer. They have removed a mass that was the size of a big grapefruit. in the mass there are strings (VERY UNUSUAL) lymp nodes are affected and they are saying aggressive cancer. Chemo has not been started yet. how long do you think he has.he is 39 years old , the doctors are saying he has had it for 5 years
[|AI|]  Hi and welcome to Chat Doctor. I am sorry about your son and this serious diagnosis. This is really unusual in his age, especailly that kind of aggressively. Usually those cancers are found in stage 2 and 3. Statistically the five-year survival rate for people diagnosed in this stage is about 8 percent but if he doesn't have verified metastasis yet and if he shows good reaction to chemo I think he really can hope for those 5 years. Not more, unfortunately.Wish you good luck.