Estimation of secondary cancer risk after radiotherapy in high-risk prostate cancer patients with pelvic irradiation.

We aimed to estimate the risk of secondary cancer after radiotherapy (RT) in high-risk prostate cancer (HRPC) patients with pelvic irradiation. Computed tomography data of five biopsy-proven HRPC patients were selected for this study. Two different planning target volumes (PTV and PTV ) were contoured for each patient.