Randomized Comparison Between the FAST-FORWARD Schedule and the HAI5 Schedule for Breast Cancer Radiotherapy in 5 Fractions

Previously, radiotherapy treatments for breast cancer usually consisted of 20-25 sessions to treat the entire breast, followed by an additional dose ("boost") to the tumor bed of 4-8 sessions. Today, 15-16 treatment sessions have become standard for whole breast irradiation, followed by a boost if indicated. The durability of further shortening the treatment to 5 sessions was proven in the FAST and FAST-FORWARD studies. After 10 and 5 years, the outcome was comparable with 25 and 15 radiation sessions, both in terms of toxicity and locoregional control.

There are currently 2 radiotherapy schedules in 5 sessions in use in Belgium (the FAST-FORWARD schedule and the HAI5 schedule), both of which have their advantages and disadvantages. In this project we want to investigate which schedule gives the fewest side effects and the best quality of life using questionnaires at different times (before, during and after radiation).

Patients participating in the study will be randomized 1:1 between the FAST-FORWARD schedule and the HAI5 schedule. The first group is treated according to the FAST-FORWARD schedule, consisting of 5 radiation sessions on 5 consecutive working days (e.g. Monday to Friday). In the schedule 2 rest days are allowed, so that the treatment lasts a maximum of 7 days. The second group is treated according to the HAI5 schedule, developed by the radiotherapy department of Ghent University Hospital. In this schedule, at least 1 day of rest is scheduled between each treatment session, so the treatment is administered over 10-14 days.