@tisme, if your medical team thought you would benefit from chemotherapy, they would have offered it to you.
When you look at the stats for most chemo, the improvement in survival over five years is usually around 7%. Which are miserable odds if you have to have it.
This disease is random in the extreme. There are no guarantees, no warranties and absolutely no way of knowing if you are free of the parasite. The best you can do is trust the advice given to you and hope for the best.
Good luck. Mxx