I'm sorry to hear about your new challenges. You've been carrying on the fight for 7 years already, and the fact that you're feeling great at 80 gives me hope that you have many, many more years of joyful life in you.

I can't remember for sure, but I think you're the one who mentioned that Princess Margaret Hospital in Toronto is the world's 10th highest ranked cancer centre, behind Mayo Rochester (4th place) but ahead of the Cleveland Clinic (17th place) and the other Mayo satellite clinics. Are you getting treatment there? If so, then you can be pretty confident that the options they give you for "what's next?" will be the best and latest. But really, any major Canadian cancer centre associated with a university medical school will be great, because practitioners/researchers move back and forth among the top cancer treatment clinics (my new oncologist just came back home to Canada from Harvard med school), and they carry their knowledge around with them.

Best of luck!