t really give specific data for optimistic people, but I would say that chemotherapy seems to be improving outcomes of some stage
3 groups more than the stage
2 groups (so for some cases, it may be better to be stage
3 than stage 2), hence chemotherapy is a good step to consider. And people with a positive attitude tend to do better than people who will be so negative as to see only the side effects of the treatment they are undergoing.
I wish your friend the best. Stay positive.