Is it safe to give thoracic irradiation to a patient with lung cancer previously treated with a VEGF inhibitor?

We did a study in patients getting VEGF inhibitors and SBRT. Anecdotally we had seen some impressive (small bowel necrosis requiring surgery) and unpredicted toxicity and we were looking for a common factor that tied them together. VEGF inhibition was that common factor. These are all patients treat...