For women who have difficulty healing after a mastectomy but need adjuvant radiation therapy, is there an amount of time for which you would abandon plans for radiation?   

While there are data on this topic, there is no clear consensus. Typically, if the patient is not receiving any therapy (ex. post-neoadjuvant chemotherapy patient), I try to initiate RT within 3 months of surgery. On occasion, I have pushed to 4 months but ideally 3 months though, there is some data...