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We investigate the effects of radiation therapy on the mortality
and economic outcomes of breast cancer patients. We implement
a 2SLS strategy within a difference-in-differences framework exploiting
variation in treatment stemming from a medical guideline
change in Denmark. We reproduce the results from an RCT showing
the lifesaving benefits of radiotherapy. We then show radiation
therapy also has economic returns: ten years after diagnosis, treatment
increases employment by 37% and earnings by 45%. Previous
work has documented a substantial employment drop after a
breast cancer diagnosis. Our results imply that radiation therapy
can reduce this effect by 70%.