What dose-fractionation would you utilize to palliate a symptomatic distal rectal cancer in an inoperable elderly gentleman with previous prostate bed radiation therapy 30 years prior?

First, I think we should all remember that the incidence of rectal cancer is about doubled after prostate RT. That would generally not influence my decisions about using RT for prostate cancer, but we should keep this in mind (and inform the patient). The decision about palliative RT is heavily depe...