Assessing the safety and feasibility of neoadjuvant hormone and radiation therapy followed by robot-assisted radical prostatectomy for treating locally advanced prostate cancer: protocol for an open-label, dose-escalation, single-centre, phase I clinical trial.

introductionPatients with locally advanced prostate cancer are at high risk of recurrence after definitive treatment. There are emerging data that radical prostatectomy can delay the progression of castration resistance and potentially prolong survival. Neoadjuvant radiation therapy improves local control and has shown survival benefit with favourable toxicity profiles in several other malignancies. We have designed this trial to investigate whether this combination, which theoretically maximises local control, is a safe and feasible approach for treating locally advanced prostate cancer. METHODS AND ANALYSIS: This study is a phase I, open-label study to investigate the safety and feasibility of neoadjuvant hormone and radiation therapy followed by robot-assisted radical prostatectomy by a traditional 3+3 dose-escalation design with four planned radiation dose levels (39.6 Gy/22F, 45 Gy/25F, 50.4 Gy/28F and 54 Gy/30F). Locally advanced prostate cancer patients with positive pelvic and/or retroperitoneal lymph nodes will be recruited. The primary objective is to determine the adverse events and maximal tolerable dose (MTD) of neoadjuvant radiotherapy. Toxicity will be assessed using the National Cancer Institute Common Toxicity Criteria V.5.0. ETHICS AND DISSEMINATION: This protocol was approved by the Institutional Review Board of Shanghai Changhai Hospital (ref. CHEC2019-070 and CHEC2019-082). The study will be performed in compliance with applicable local legislation and in accordance with the ethical principles developed by the World Medical Association in the Declaration of Helsinki 2013. Study results will be disseminated through conferences and peer-reviewed scientific journals. TRIAL REGISTRATION NUMBERS: ChiCTR1900022716; ChiCTR1900022754.