What do systematic reviews say?

Summary of findings: Evening RT vs morning RT

Summary of findings: Evening RT may leads to lower acute and late GI toxicity (grade 2+) compared with morning RT (low certainty).

• Interventions to reduce acute and late adverse gastrointestinal effects of pelvic radiotherapy for primary pelvic… 2018 · Cochrane Headline outcomes only
  RR 0.51 [0.34, 0.76]
  2 studies · 294 participants
  Low