Am J Clin Oncol
Pelvic Reirradiation Utilizing Pulsed Low-dose Rate Radiation Therapy.   
ABSTRACT
Pulsed low-dose rate radiation therapy has been shown to reduce normal tissue damage while decreasing DNA damage repair in tumor cells. In a cohort of patients treated with palliative or definitive pelvic reirradiation using pulsed low-dose rate radiation therapy, we observed substantial local control and low rates of toxicity.

Related Questions

If a patient is not a surgical candidate, what it the most appropriate treatment? 

Would the location of the tumor (i.e. ultralow), symptoms (bleeding), or patient resistance to surgery play into this decision?