What is the maximum time you would wait after hysterectomy to start RT for a FIGO II endometriod adenocarcinoma before cancelling treatment and saving for salvage?

Great question, and I don't know that there is a perfect answer. If I were going to answer with some specificity, I would say 4 months. Obviously this is not ideal. However, in the presence of more compelling indications for treatment (your question relates to stage II patients/stromal invasion), I would probably push that time out to 5 months. For example, risk factors such as positive margins, extensive LVSI, and high grade (or some combination) might create a clinical scenario is which the risk of local recurrence is sufficiently high (even with a longer recurrence free interval) that I would still offer adjuvant treatment. I will just add that, in these situations, I would be much more likely to offer external RT than cuff brachy only, ...