I had the same (DCIS left breast, no lymph nodes involved). Lumpectomy and oncoplastic at same time (Dec). Had 16 sessions of radiation begun 4 weeks after the surgery. I wasn’t given an “either/or” option—both were offered. But it was explained that radiation provided 30% additional risk reduction for cancer recurrence, whereas the hormone pills added about only 4% risk reduction. That small reduction plus the likelihood of the side effects from Anastrozole were the reasons why I am not taking Anastrozole. I’m 73. All done now and so far so good. All these decisions and new information is daunting but you will get through it! Wishing you well and good outcomes.