- Significant prior external beam dose-limiting radiation to a critical organ based on review of the prior radiation treatment records by the Radiation Oncology PI; patients who have had prior external beam radiation > 2000 cGy (at 180 to 200 cGy per day) to the lung will be ineligible; patients with ANY prior radiation to the heart are ineligible; patients with > 500 cGy to the kidney will be excluded from the study; Note: patients who have had electron beam therapy are still eligible and will be evaluated on a case by case basis by the Radiation Oncology PI