Yes people who have had radiation are listed as one of the groups of concern with Tymlos. I had treatment for breast cancer 2015-20 and tests show high risk so I am concerned about tiny metastases that could perhaps grow on Tymlos. I am doing a year to start and will see how it goes. Even 6 months helps- that is when the most bone growth happens. I believe bone cancer risk depended on dose and duration.