Biological dose volume histograms during conformal hypofractionated accelerated radiotherapy for prostate cancer

Radiobiological data suggest that prostate cancer has a low α ∕ β ratio. Large radiotherapy fractions may, therefore, prove more efficacious than standard radiotherapy, while radiotherapyacceleration should further improve control rates. This study describes the radiobiology of a conformal hypofractionated acceleratedradiotherapy scheme for the treatment of high risk prostate cancer. Anteroposterior fields to the pelvis deliver a daily dose of 2.7 Gy , while lateral fields confined to the prostate and seminal vesicles deliver an additional daily dose of 0.7 Gy . Radiotherapy is accomplished within 19 days (15 fractions). Dose volume histograms, calculated for tissue specific α ∕ β ratios and time factors, predict a high biological dose to the prostate and seminal vesicles ( 77 – 93 Gy ) . The biological dose to normal pelvic tissues is maintained at standard levels. Radiobiological dosimetry suggests that, using hypofractionated and acceleratedradiotherapy, high biological radiationdose can be given to the prostate without overdosing normal tissues.