Prostate Cancer Active Surveillance Trigger Trial (PCASTT-UK): Comparing Current Practice for Men With Prostate Cancer on Active Surveillance (AS) to an AS Protocol With Standardised Triggers for Transitioning to Curative Treatment

STUDY HYPOTHESIS The aim of this trial is to test the safety of an Active Surveillance protocol comparing current practice to standardized triggers for initiation of curative treatment, based on Magnetic Resonance Imaging or biopsy pathology. The study hypothesis is that standardized triggers will reduce overtreatment without increasing disease progression and prostate cancer mortality.

STUDY DESIGN Randomized multi-centre open-label clinical trial.

INTERVENTIONS Patients within 12 months of a diagnosis of prostate cancer will be approached and consented to the study. Computerised randomisation (1:1) will assign participants to either the control (Arm 1) or intervention arm (Arm 2). In the control arm, patients will be treated according to active surveillance protocol at the trial centre; in the intervention arm patients will follow standardised active surveillance protocol applying specific criteria for repeat biopsies and the initiation of curative treatment. Patients are stratified by centre and Gleason score.

FOLLOW UP In both arms, patients will followed up for 10 years with the following schedule: a PSA test every 6 months, clinical examination (with PSA test) and Quality of Life (QoL) questionnaire annually, and MRI every second year. Re-biopsy and/or initiation of curative treatment depends on the trial arm patients are randomised to.

Repeat biopsies

Arm 1 (control arm): according to current practice (urologists' judgement)

Arm 2 (intervention arm): standardised triggers

• A systematic repeat biopsy if PSA density increases to > 0.2 ng/ml/cc, and then at every 0.1 ng/ml/cc increase
• MRI progression in men with previously only Gleason grade 3+3: 5 mm or more increase in size in any dimension of a measurable lesion, increase in PI-RADS score to 3-5, a new lesion with PI-RADS score 3-5, or high or very high suspicion of extra-capsular extension or seminal vesicle invasion
• MRI progression in men with Gleason grade 3+4: 5 mm or more increase in size in any dimension of a measurable lesion, or a new lesion with PI-RADS score 3-5

Curative treatment

Arm 1 (control arm): According to current practice (urologists judgement)

Arm 2 (intervention arm): standardised triggers

• MRI progression in lesions with confirmed Gleason grade 4: increase in PI-RADS score to 4 or 5, or high or very high suspicion of extra-capsular extension or seminal vesicle invasion
• Pathological progression: Gleason pattern 5, primary Gleason pattern 4 in any core with 5 mm or more cancer, Gleason 3+4 in 3 or more cores or 30% if more than 10 cores are taken, or Gleason 3+4 in 10 mm or more cancer

Patients will remain on trial unless they end Active Surveillance due to initiation of treatment, development of metastases, transition to watchful waiting, or death of any cause. After the initiation of curative treatment, watchful waiting, or palliative treatment for cancer progression, the patient is treated according to the standard protocol of the participating centre.

Inclusion criteria

• Recently (within 12 months) diagnosed adenocarcinoma of the prostate
• Tumour stage ≤ T2a, NX, M0 (former MX)
• PSA <15ng/ml, PSA density ≤ 0.2 ng/ml/cm3
• Gleason pattern 3+3=6 (any number of cores, any cancer involvement) or Gleason pattern 3+4=7 (<3 cores (or ≤30 % of cores if more than ten cores), <10 mm cancer in one core)
• Life expectancy >10 years with no upper age limit*
• Candidate for curative treatment if progression occurs
• Signed written informed consent.

• There is no upper age limit; however the estimated remaining lifetime for the patient should be more than ten years. The potential life expectancy of the participants should be estimated based on age, co-morbidity and risk factors for death, such as frailty and smoking.

Exclusion criteria

• Not eligible for AS according to above criteria
• Not competent in spoken or written English