“Watching and waiting” was actually done as a study named COMET and the outcomes were the same for those who had surgery and those who didn’t as far as mortality. Many of those that “waited” did take endocrine therapy, though. It sounds very wise to move to the Mayo Clinic and I would discuss your options with your provider(s) there. All DCIS is stage 0, meaning that it hasn’t spread outside the milk duct. I was diagnosed with it also in March, had surgery and radiation, and am now contemplating endocrine (anti-estrogen) therapy as my DCIS was estrogen and progesterone positive. I am 70, if I were your age, I would seriously consider the watching and waiting option. Also, I had a nipple discharge as my only symptom, my DCIS did not show up on mammogram or ultra sound. It did show up on MRI with contrast. So I didn’t want to live with the nipple discharge forever, making me choose surgery. I really believe that your doctors will help you make a decision that’s best for you, based on the extent of your DCIS and your other health issues. The surgery for me was outpatient, lasted less than 2 hours, and I went home the same day. Your heart condition may make surgery more difficult, but you need to find out. Best wishes to you whatever you decide, my surgeon told me “this (the cancer) is not going to kill you, you are fine.” Even so, it was still scary and hard to deal with, but you’ve come to the right place for support! 💚