I read the guidelines on the site myself after the oncologist gave me a copy but didn't save account info and password. Web search for NCCN guidelines and go from there. You'll have to create an account to read them. Then search by breast cancer on the mega guidelines page and go from there. There is a DCIS category. Then you have to scroll through those to get to stage 1 (early stage) and the guidelines for several sub-menu items by estrogen sensitivity. When you get to E+, P+, HER2- there are recommendations and the one for women over 70 with this as first-event breast cancer is to not recommend radiation. Or maybe call NCCN and they can direct you to exact link. But you'll still have to register to access it alas. It tool me some time but the stuff is there. Hope this helps.