Clinical trial NCT03899077: Radiotherapy Combined With a LHRH (Ant)Agonist Versus Apalutamide in Patients With Biochemical Recurrence After RP
Official title: A Phase II Study Comparing Salvage Radiotherapy in Combination With 6 Months of Androgen-deprivation Therapy Versus Anti-androgen Therapy With Apalutamide in Patients With Biochemical Progression After Radical Prostatectomy
Study type: INTERVENTIONAL
Overall status: RECRUITING
Phase: PHASE2
Conditions: Cancer of Prostate
Lead sponsor: Cancer Research Antwerp
Sponsor class: OTHER
Collaborators: name: Janssen Pharmaceutica
First posted: 2019-04-02
Enrollment: 202
Sex: MALE
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: TREATMENT

Brief summary: This is a phase II randomized, open-label study comparing salvage radiotherapy in combination with 6 months of androgen-deprivation therapy (ADT) with LHRH agonist or antagonist (arm A) versus anti-androgen therapy (AAT) with apalutamide 240mg daily (arm B) in hormone-naïve patients with biochemical progression after radical prostatectomy. All subjects will receive salvage radiotherapy as standard of care and will be randomly assigned in a 1:1 ratio to receive either 6 months of androgen-deprivation therapy (ADT) with LHRH agonist or antagonist through 6 monthly, two 3-monthly or one 6-monthly injections (control arm) or 6 28-day cycles of apalutamide 240mg daily (interventional arm). The study will include a screening phase, treatment phase, and a post-treatment phase. The primary objective of the trial is to compare sexual function between the 2 groups based on the Expanded Prostate cancer Index Composite (EPIC)-26 sexual domain scores at 9 months after start of hormonal treatment.

Detailed description: After radical prostatectomy, around one third of patients will have biochemical progression. Salvage radiotherapy (SRT) is still potentially curative, but about 40-50% of patients will progress further. Recently, success rates of SRT were significantly improved through the use of concomitant anti-androgen (AAT) or androgen-deprivation (ADT) therapy. In RTOG 96-01, 2 years of bicalutamide 150 mg resulted in a 5% overall survival benefit at 12-years. In GETUG-AFU 16, 5-year progression-free survival was significantly improved when SRT was combined with 6 months of an LHRH agonist. Based on GETUG-AFU 16, most radiation oncologists now combine SRT with at least 6 months of ADT. However, ADT comes with several serious side-effects, both physical (cardiovascular, metabolic, musculoskeletal) and psychological (sexual, emotional and cognitive). It appears worthwile to look for alternatives in the form of AAT. In that respect, apalutamide, a potent competitive and purely antagonistic second-generation anti-androgen, is the ideal candidate.

This trial is a phase II randomized, open-label study comparing salvage radiotherapy in combination with 6 months of ADT (arm A) versus AAT with apalutamide 240mg daily (arm B) in hormone-naïve patients with biochemical progression after radical prostatectomy. All subjects will receive salvage radiotherapy as standard of care and will be randomly assigned in a 1:1 ratio to receive either 6 months of ADT with LHRH agonist or antagonist through 6 monthly, two 3-monthly or one 6-monthly injections (control arm A) or 6 28-day cycles of apalutamide 240mg daily (interventional arm B).

The study will include a screening phase, treatment phase, and a post-treatment phase.

1. Screening phase: allows for assessment of subject eligibility up to 35 days prior to randomization.
2. Treatment phase: includes the hormonal treatment for 6 months, to be started at the most 2 weeks after randomization and standard salvage radiotherapy. During the treatment phase, patients will have 3 study visits:

   1. treatment initiation visit: first injection of LHRH (ant)agonist (arm A) or cycle 1, day 1 (C1D1) of apalutamide (arm B).
   2. Concurrent with RT visit: if necessary (depending on product prescribed) injection of LHRH (ant)agonist (arm A) or cycle 4, day 1 (C4D1) of apalutamide (arm B).
   3. End of treatment visit: at the end of the 6 months of hormonal therapy.
3. Post-treatment phase: will begin after a subject completes the treatment phase and the end of treatment visit and will continue until the primary endpoint is reached, i.e. the 9-months (3 months after end of treatment visit) EPIC-26 sexual domain score.

The primary objective of the trial is to compare sexual function between the 2 groups based on the EPIC-26 sexual domain (0 - 100 scale, with higher scores representing better sexual function) at 9 months after start of hormonal treatment (primary endpoint). The following secondary endpoints will be explored:

1. Quality of life: assessed using EPIC-26 as well as the EORTC quality of life questionnaires C30 and PR25 as well as FACT-P.
2. Toxicity: will be assessed using the Common Terminology Criteria for Adverse Events (CTCAE) version 5.0.
3. Efficacy: prostate-specific antigen (PSA) response rates, defined as a decline from baseline in PSA level of 80% or greater, as well as PSA complete response rates, defined as a decline from baseline in PSA level of 90% or greater, will be prospectively collected at the 4 treatment visits.

At this point in time, no study has directly compared apalutamide to LHRH agonists or antagonists in combination with SRT. This trial may be a preamble to the design of a registration trial in such patients or indeed patients with a intermediate and high-risk localized disease that are scheduled for EBRT or brachytherapy as radical treatment and also benefit from 6 months of hormonal treatment.

Eligibility criteria: Inclusion Criteria:

1. Male, \> 18 years old.
2. ECOG 0-1.
3. Histologically confirmed adenocarcinoma of the prostate.
4. Previous radical prostatectomy (RP), pT2-3, pN0 or pNx.
5. PSA detectable with confirmed rise (at least 2 weeks apart) at least 8 weeks after RP.
6. Hormone-naive disease.
7. Patients amendable to take oral medication.
8. Patients must have clinical laboratory values at screening:

   1. Hemoglobin 9.0 g/dL, independent of transfusion and/or growth factors within 3 months prior to randomization
   2. Platelet count ≥100,000 x 109/µL independent of transfusion and/or growth factors within 3 months prior to randomization
   3. Serum albumin ≥3.0 g/dL
   4. Serum creatinine \<2.0 × upper limit of normal (ULN)
   5. Serum potassium ≥3.5 mmol/L
   6. Serum total bilirubin 1.5 × ULN (note: in subjects with Gilbert's syndrome, if total bilirubin is \>1.5 × ULN, measure direct and indirect bilirubin and if direct bilirubin is ≤1.5 × ULN, subject may be eligible)
   7. Aspartate aminotransferase (AST) or alanine aminotransferase (ALT) \<2.5 × ULN
9. Medications known to lower the seizure threshold must be discontinued or substituted at least 4 weeks prior to study entry.
10. Patient agrees to use a condom (even men with vasectomies) and another effective method of birth control if he is having sex with a woman of childbearing potential or agrees to use a condom if he is having sex with a woman who is pregnant while on study drug and for 3 months following the last dose of study drug. Must also agree not to donate sperm during the study and for 3 months after receiving the last dose of study drug.
11. Patients who have received the information sheet and signed the informed consent form.
12. Patients must be willing to comply with scheduled visits, treatment plan, laboratory tests, and other study procedures.

Exclusion Criteria:

1. Patients with severe erectile dysfunction according to international index of erectile function (IIEF-5) questionnaire (score 1-7).
2. Allergies, hypersensitivity or known intolerance to the study drugs or excipients.
3. History of any of the following:

   1. Seizure or known condition that may pre-dispose to seizure (including but not limited to prior stroke, transient ischemic attack, loss of consciousness within 1 year prior to randomization, brain arteriovenous malformation; or intracranial masses such as schwannomas and meningiomas that are causing edema or mass effect).
   2. Severe or unstable angina, myocardial infarction, symptomatic congestive heart failure, arterial or venous thromboembolic events (eg, pulmonary embolism, cerebrovascular accident including transient ischemic attacks), or clinically significant ventricular arrhythmias within 6 months prior to randomization.
4. Current evidence of any of the following:

   1. Uncontrolled hypertension.
   2. Gastrointestinal disorder affecting absorption.
5. Patients already included in another clinical trial involving an experimental drug.

Primary outcomes:
measure: EPIC-26 sexual domain score
timeFrame: 9 months after start of hormonal treatment
Secondary outcomes:
measure: FACT-P quality of life global score
timeFrame: 9 months after start of hormonal treatment
measure: EORTC QLQ C30 quality of life score
timeFrame: 9 months after start of hormonal treatment
measure: EORTC QLQ PR25 quality of life score
timeFrame: 9 months after start of hormonal treatment
measure: Grade of acute toxicity
timeFrame: After obtaining informed consent and up to 30 days after last dose
measure: PSA response rates
timeFrame: 0, 3, 6, and 9 months
Other outcomes:
Locations:
city: Aalst
country: Belgium
facility: OLVZ Aalst
city: Brugge
country: Belgium
facility: AZ Sint-Jan
city: Bruxelles
country: Belgium
facility: Hopital Erasme
city: Gent
country: Belgium
facility: UZ Gent
city: Haine-Saint-Paul
country: Belgium
facility: CH Jolimont
city: Jette
country: Belgium
facility: UZ Brussel
city: Kortrijk
country: Belgium
facility: AZ Groeninge
city: Namur
country: Belgium
facility: CHU UCL Namur
city: Wilrijk
country: Belgium
facility: GZA
Study officials:
affiliation: Gasthuis Zusters Antwerpen
name: Piet Dirix
role: PRINCIPAL_INVESTIGATOR
References:
citation: Dirix P, Strijbos M, den Mooter TV, Liefhooghe N, Bruwaene SV, Uvin P, Ghysel C, Ost D, Schatteman P, Bral S, Engels B, den Begin RV, Otte FX, Roumeguere T, Palumbo S, Neybuch Y, Fonteyne V, Ost P, Dirix L. Phase II open-label study investigating apalutamide in patients with biochemical progression after radical prostatectomy. Future Oncol. 2020 Jun;16(16):1083-1189. doi: 10.2217/fon-2020-0056. Epub 2020 May 1.