Under what circumstances would you recommend hypofractionated radiation for bladder cancer?

In the BC2001 study (James N, NEJM 366:1477, 2012) that showed a benefit to chemoradiotherapy over radiotherapy alone, two fractionation schemes were allowed: 64 Gy in 32 fractions of 2 Gy or 55 Gy in 20 fractions of 2.75 Gy. Of the 360 patients in the trial, 40% had the shorter, 4 week fractionatio...