In my case the radiation oncologist was more conservative than the surgeon, who had suggested one week of radiation. When he saw the lobular cells trailing off (or some such language) he wanted to make sure that he gets everything. Three weeks. And I'm all for that! Why go to all this trouble and than risk a recurrence because you shorted the treatment? Cancer makes us put on our big girl pants. I'm still not sure who handles questions now that I've met three docs. Maybe the navigator?