I don't think we have very many treatments that are 100% efficacious and durable for most conditions, even ones that are generally considered curative. If you

I don't think we have very many treatments that are 100% efficacious and durable for most conditions, even ones that are generally considered curative. If you take antibiotics-- sometimes it doesn't seem to work at all, and some other times the infection comes back after the cessation of treatment. This is true because of some reasons that are well-understood, and others that aren't. Yes, most cancers are worse on these metrics than most uses of antibiotics, but not always ridiculously so. There are cancers with 5 year survival rates of >95%, and with very low recurrence rates after 5 years.