PROTEUS
Research type
Research Study
Full title
A Randomized, Double-blind, Placebo-controlled, Phase 3 Study of Apalutamide in Subjects with High-risk, Localized or Locally Advanced Prostate Cancer Who are Candidates for Radical Prostatectomy
IRAS ID
254146
Contact name
Jonathan Aning
Contact email
Sponsor organisation
Janssen-Cilag International NV
Eudract number
2018-001746-34
Clinicaltrials.gov Identifier
Duration of Study in the UK
3 years, 11 months, 14 days
Research summary
Outcomes in patients with high-risk prostate cancer who undergo radical prostatectomy (surgery which aims to remove the whole prostate, and the cancer cells inside it) as a primary therapy have not significantly improved with time. Early prostate cancer is highly responsive to hormonal blockade. Therefore, androgen (a steroid hormone) blockade prior to and after prostate surgery could decrease tumour burden, increase the likelihood of complete resection and improve objective outcomes such as metastasis-free survival (MFS – time without the cancer spreading) and overall survival (OS).
The purpose of this study is to determine whether 6 months of treatment with apalutamide (an antagonist of the androgen receptor), with or without abiraterone acetate and prednisone (AAP), and in combination with androgen deprivation therapy (ADT), improves the pathological complete response rate and MFS rates in patients with high risk localised prostate cancer that are indicated to undergo a radical prostatectomy, compared to patients receiving ADT and a placebo.
The study will consist of a screening period of up to 35 days, after which participants will be randomised (randomly selected) to receive either apalutamide (with or without AAP) and ADT or receive ADT and a placebo. Participants will then receive 6 months of treatment in 28 day treatment cycles, before undergoing a radical prostatectomy. They will then receive a further 6 months of treatment. Following the treatment phase, participants will enter a post treatment phase in which they will be followed up until death, the cancer spreads, they withdraw from the study or they are lost to follow-up.
REC name
East Midlands - Leicester Central Research Ethics Committee
REC reference
19/EM/0028
Date of REC Opinion
15 Mar 2019
REC opinion
Further Information Favourable Opinion