CClinicalTrials.gg
Active, not recruitingNCT05171816Updated Aug 28, 2026Results posted

Study on Olaparib Plus Abiraterone as First-line Therapy in Men With Metastatic Castration-resistant Prostate Cancer (China Cohort)

A Phase 3 interventional study of olaparib and abiraterone acetate in Metastatic Castration-resistant Prostate Cancer, sponsored by AstraZeneca. Active, not recruiting at 26 sites in China. Open to male participants aged 18 Years to 99 Years. Per ClinicalTrials.gov, last updated 2026-08-28.

Sponsored by AstraZeneca · Phase 3, Interventional, and Treatment

From the registry’s dates

  • Registered 5 months after the study started (first participant enrolled Jun 2021, registered Dec 2021).
Phase
Phase 3
Study type
Interventional
Enrollment
110
Allocation
Randomized
Ages
18 Years to 99 Years
Sex
Male
01

Study summary

The purpose of this study is to evaluate the efficacy and safety (including evaluating side effects) of combination of olaparib and abiraterone versus placebo and abiraterone in patients with metastatic castration-resistant prostate cancer (mCRPC) who have received no prior cytotoxic chemotherapy or new hormonal agents (NHAs) at metastatic castration-resistant prostate cancer (mCRPC) stage.

Read the detailed description

PROpel is a phase III study evaluating the efficacy, safety, and tolerability of olaparib versus placebo when given in addition to abiraterone to patients with metastatic castration-resistant prostate cancer (mCRPC) who have not received prior chemotherapy or new hormonal agents (NHAs) for metastatic castration-resistant prostate cancer (mCRPC) (first-line setting).

Approximately 720 patients globally were planned to be randomized in PROpel in a 1:1 ratio to treatment with either olaparib and abiraterone or placebo and abiraterone. Enrolment had completed with a total of 796 patients randomised. Following the completion of global enrolment, the China cohort will randomise approximately 108 additional patients at sites in China, also in a 1:1 ratio.

This cohort will enable standalone safety and efficacy analyses to support Chinese regulatory requirements. Patients from China will not be included in the Full Analysis Set for the global study analysis. In addition, all of the statistical analyses defined in this SAP will be performed using all patients randomised at sites in Asian countries (South Korea and Japan) excluding China, to be designated the Asian subgroup analysis.

Patients will receive oral treatment with olaparib 300 mg twice daily + abiraterone 1000 mg once daily or placebo twice daily + abiraterone 1000 mg once daily. Patients in both treatment groups will also receive either prednisone or prednisolone 5 mg twice daily.

02

Conditions studied

  • Metastatic Castration-resistant Prostate Cancer

Keywords

  • metastatic castration-resistant prostate cancer (mCRPC)
03

In context

Lead sponsor

AstraZeneca is the lead sponsor of 3,429 studies on the registry; 270 are open to participants now.

Of its 358 completed or terminated interventional studies of FDA-regulated products, 173 (48%) have results posted.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years to 99 Years
Sexes eligible
Male
Accepts healthy volunteers
No

Inclusion criteria

  1. Capable of giving signed informed consent, which includes compliance with the requirements and restrictions listed in the informed consent form and in the study protocol.
  2. Provision of signed and dated, written informed consent form prior to any mandatory study specific procedures, sampling, and analyses.
  3. For inclusion in i) the optional exploratory genetic research and ii) the optional biomarker research, patients must fulfill the following criteria:

    • Provision of informed consent for genetic research prior to collection of sample.
    • Provision of informed consent for biomarker research prior to collection of sample.

    If a patient declines to participate in the optional exploratory genetic research or the optional biomarker research, there will be no penalty or loss of benefit to the patient. The patient will not be excluded from other aspects of the study.

  4. Patients must be ≥18 years of age (or ≥19 years of age in South Korea) at the time of signing the informed consent form. For patients enrolled in Japan who are \<20 years of age, written informed consent should be obtained from the patient and from his legally acceptable representative.
  5. Histologically or cytologically confirmed prostate adenocarcinoma.
  6. Metastatic status defined as at least 1 documented metastatic lesion on either a bone scan or a computed tomography(CT)/ magnetic resonance imaging (MRI) scan.
  7. First-line metastatic castration-resistant prostate cancer (mCRPC).
  8. Ongoing androgen deprivation with gonadotropin-releasing hormone analogue or bilateral orchiectomy, with serum testosterone \<50 nanograms per decilitre (ng/dL) (\<2.0 nanomoles per litre (nmol/L)) within 28 days before randomisation. Patients receiving androgen deprivation therapy (ADT) at study entry should continue to do so throughout the study.
  9. Candidate for abiraterone therapy with documented evidence of progressive disease.
  10. Patients must have normal organ and bone marrow function measured within 28 days prior to administration of study treatment.
  11. Eastern Cooperative Oncology Group (ECOG) performance status 0-1, with no deterioration over the previous 2 weeks.
  12. The participant has, in the opinion of the investigator, a life expectancy of at least 6 months.
  13. Prior to randomisation, sites must confirm availability of either an archival formalin fixed, paraffin embedded (FFPE) tumour tissue sample, or a new biopsy taken during the screening window, which meets the minimum pathology and sample requirements in order to enable homologous recombination repair (HRR) status subgroup analysis of the primary endpoint radiographic progression-free survival (rPFS). If there is not written confirmation of the availability of tumour tissue prior to randomisation, the patient is not eligible for the study.
  14. Male patients must use a condom during treatment and for 3 months after the last dose of olaparib+abiraterone when having sexual intercourse with a pregnant woman or with a woman of childbearing potential. Female partners of male patients should also use a highly effective form of contraception if they are of childbearing potential.

Exclusion criteria

Exclusion Criteria:

  1. Has a known additional malignancy that has had progression or has required active treatment in the last 5 years.
  2. Patients with myelodysplastic syndrome (MDS)/ acute myeloid leukaemia (AML) or with features suggestive of yelodysplastic syndrome (MDS)/ acute myeloid leukaemia (AML).
  3. Clinically significant cardiovascular disease Association Class II-IV heart failure or cardiac ejection fraction measurement of \<50% during screening as assessed by echocardiography or multigated acquisition scan.
  4. Planned or scheduled cardiac surgery or percutaneous coronary intervention procedure.
  5. Prior revascularisation procedure (significant coronary, carotid, or peripheral artery stenosis).
  6. Uncontrolled hypertension (systolic blood pressure (BP) ≥160 millimeters of mercury (mmHg) or diastolic blood pressure (BP) ≥95 millimeters of mercury (mmHg)).
  7. History of uncontrolled pituitary or adrenal dysfunction.
  8. Active infection or other medical condition that would make prednisone/prednisolone use contraindicated.
  9. Any chronic medical condition requiring a systemic dose of corticosteroid >10 milligrams (mg) prednisone/prednisolone per day.
  10. Patients who are considered a poor medical risk due to a serious, uncontrolled medical disorder, non-malignant systemic disease or active, uncontrolled infection.
  11. Persistent toxicities (Common Terminology Criteria for Adverse Events [CTCAEs] grade >2) caused by previous cancer therapy, excluding alopecia.
  12. Patients with brain metastases. A scan to confirm the absence of brain metastases is not required.
  13. Patients with spinal cord compression are excluded unless they are considered to have received definitive treatment for this and have evidence of clinically stable disease for 4 weeks.
  14. Patients who are unevaluable for both bone and soft tissue progression
  15. Patients who are unable to swallow orally administered medication and patients with gastrointestinal disorders likely to interfere with absorption of the study medication.
  16. Immunocompromised patients
  17. Patients with known active hepatitis infection (ie, hepatitis B or C).
  18. Any previous treatment with Polyadenosine 5'diphosphoribose [poly (ADP ribose)] polymerase (PARP) inhibitor, including olaparib.
  19. Patients receiving any systemic chemotherapy or radiotherapy (except for palliative reasons) within 3 weeks prior to study treatment. Patients who receive palliative radiotherapy need to stop radiotherapy 1 week before randomisation.
  20. Any previous exposure to a Cytochrome P450 (CYP) 17 (17α-hydroxylase/C17,20-lyase) inhibitor (eg, abiraterone, orteronel).
  21. Concomitant use of known strong Cytochrome P450 (CYP) 3A inhibitors (eg, itraconazole, telithromycin, clarithromycin, protease inhibitors boosted with ritonavir or cobicistat, indinavir, saquinavir, nelfinavir, boceprevir, telaprevir) or moderate CYP3A inhibitors (eg, ciprofloxacin, erythromycin, diltiazem, fluconazole, verapamil). The required washout period prior to starting study treatment is 2 weeks.
  22. Concomitant use of known strong Cytochrome P450 (CYP) 3A inducers (eg, phenobarbital, enzalutamide, phenytoin, rifampicin, rifabutin, rifapentine, carbamazepine, nevirapine or St John's wort) or moderate Cytochrome P450 (CYP) 3A inducers (eg, bosentan, efavirenz or modafinil). The required period prior to starting study treatment is 5 weeks for phenobarbital and enzalutamide and 3 weeks for other agents.
  23. Major surgery within 2 weeks of starting study treatment and patients must have recovered from any effects of any major surgery.
  24. Previous allogenic bone marrow transplant or double umbilical cord blood transplantation (dUCBT).
  25. Participation in another clinical study with an investigational product or investigational medical devices within 1 month of randomisation.
  26. History of hypersensitivity to olaparib or abiraterone, any of the excipients of olaparib or abiraterone, or drugs with a similar chemical structure or class to olaparib or abiraterone.
  27. Involvement in the planning and/or conduct of the study (applies to both AstraZeneca and Merck staff and/or staff at the study site).
  28. Judgment by the investigator that the patient should not participate in the study if the patient is unlikely to comply with study procedures, restrictions and requirements.
  29. Previous randomisation in the present study.
05

Study design

Phase
Phase 3
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Quadruple (Participant, Care provider, Investigator, Outcomes assessor)
Enrollment
110 participants (actual)

Study arms

  • Experimental
    olaparib plus abiraterone

    Olaparib is available as a film-coated tablet containing 100 milligrams (mg) or 150 milligrams (mg) of olaparib. Subjects will be administered olaparib orally at a dose of 300 milligrams (mg) twice daily (bid). The initial dosage of 300 milligrams (mg) twice daily will be composed of 2 x 150 milligrams (mg) tablets per dose. The 100 milligrams (mg) and 150 milligrams (mg) tablets will be used to manage dose reductions during the study. Abiraterone acetate with prednisone or prednisolone will be sourced locally as commercially available materials. Subjects will be administered abiraterone orally at a dose of 1000 milligrams (mg) once daily, in combination with prednisone or prednisolone 5 milligrams (mg) administered orally twice daily.

    Drug: olaparib · Drug: abiraterone acetate

  • Placebo comparator
    placebo plus abiraterone

    Placebo to match olaparib is available as a film-coated tablet in 100 milligrams (mg) or 150 milligrams (mg). Subjects will be administered placebo orally at a dose of 300 milligrams (mg) twice daily (bid). The initial dosage of 300 milligrams (mg) twice daily will be composed of 2 x 150 milligrams (mg) tablets per dose. The 100 milligrams (mg) and 150 milligrams (mg) tablets will be used to manage dose reductions during the study. Abiraterone acetate with prednisone or prednisolone will be sourced locally as commercially available materials. Subjects will be administered abiraterone orally at a dose of 1000 milligrams (mg) once daily, in combination with prednisone or prednisolone 5 milligrams (mg) administered orally twice daily.

    Drug: abiraterone acetate

Interventions

  • Drugolaparib

    300 mg (2 x 150 milligrams (mg) tablets) twice daily

    Also known as: Lynparza

  • Drugabiraterone acetate

    1000 milligrams (mg) once daily

    Also known as: Zytiga

06

What researchers measure

Primary outcomes

  1. Radiological Progression Free Survival (rPFS)

    Radiological progression free survival is defined as the time from randomisation until the earlier date of radiological progression or death (by any cause in the absence of progression), regardless of whether the patient withdraws from randomised therapy or receives another anticancer therapy prior to progression. Per RECIST v1.1, progression is defined as the sum of TLs has a 20% and absolute ≥ 5mm increase from nadir, and/or unequivocal progression in any non target lesions, and/or any new lesion identified. Per PCWG3, progression on a bone scan is defined as 2 or more new lesions observed from the first visit after baseline compared to baseline, or from all other visits compared to first visit after baseline. A confirmatory scan is required.

    Time frame: Tumour imaging CT/MRI and bone scan were assessed every 8 weeks from randomisation to week 24 and then every 12 weeks until RECIST progression. Patients were followed up for 479 days (approx 16 months) at minimum and 913 days (approx 30 months) at maximum

Secondary outcomes

  1. Overall Survival (OS)

    Overall survival is defined as the time from date of randomisation to death due to any cause regardless of whether the patient withdraws from randomised therapy or receives another anticancer therapy. The 22Jan2024 DCO is the final data cut-off for the OS analysis and therefore no further updates will be made.

    Time frame: Assessed every 12 weeks from randomisation until death or data cut-off. The endpoint was followed up for 479 days (approx 16 months) at minimum and 913 days (approx 30 months) at maximum.

  2. Time to First Subsequent Anticancer Therapy or Death (TFST)

    Time to first subsequent anticancer therapy (excluding radiotherapy) is defined as the time from randomisation to the earlier of start date of the first subsequent anti cancer therapy after discontinuation of randomised treatment or death from any cause.

    Time frame: Assessed from from randomization on 30 day follow-up after last dose of study medication and every 12 weeks after that until DCO. The endpoint was followed up for 479 days (approx 16 months) at minimum and 913 days (approx 30 months) at maximum.

  3. Time to Pain Progression (TTPP)

    Time to pain progression is defined as time from randomisation to pain progression based on the Brief Pain Inventory-Short Form (BPI-SF) Item 3 "worst pain in 24 hours" (range 0-10, a higher score indicates worse pain) and opiate analgesic use (Analgesic quantification algorithm \[AQA\] score, range 0-7, a higher score indicates increased opioid use). For patients who are asymptomatic at baseline: A ≥2 point change from baseline in average (4-7 days) worst pain score observed at 2 consecutive visits or initiation of opioid use; For patients who are symptomatic at baseline: A ≥2 point change from baseline in average (4-7 days) worst pain score observed at 2 consecutive visits and an average worst pain score ≥4, and no decrease in average opioid use (≥1-point decrease in AQA score from a starting value of ≥2), or increase in opioid use (≥1-point increase, or ≥2-point increase if the starting value is 0) at 2 consecutive follow-up visits.

    Time frame: The BPI-SF and AQA were assessed on screening, day 1, day 15, day 29, day 43, day 57, day 71, and every 4 weeks after week 13 until DCO. The endpoint was followed up for 479 days (approx 16 months) at minimum and 913 days (approx 30 months) at maximum.

  4. Time to Opiate Use

    Time to opiate use is defined as the time from date of randomisation to the date of first opiate use for cancer related pain.

    Time frame: Assessed on screening, days 1, 29, and 57, every 4 weeks after week 13, treatment discontinuation, and 30-day follow-up after last dose of study medication. Followed up for 479 days (approx 16 months) at minimum and 913 days (approx 30 months) at maximum.

  5. Time to a Symptomatic Skeletal-Related Event (SSRE)

    Time from date of randomisation to date of first symptomatic skeletal-related event as defined by any of the following or a combination: * Use of radiation therapy to prevent or relieve skeletal symptoms. * Occurrence of new symptomatic pathological bone fractures (vertebral or non-vertebral). * Occurrence of spinal cord compression. * Orthopaedic surgical intervention for bone metastasis.

    Time frame: Assessed at every visit from randomisation up to and including treatment discontinuation visit. The endpoint was followed up for 479 days (approx 16 months) at minimum and 913 days (approx 30 months) at maximum.

  6. Time to Second Progression or Death (PFS2)

    The time to PFS2 is defined as the time from date of randomisation to date of second progression on next-line (immediately after study treatment) anticancer therapy or death, whichever occurs earlier.

    Time frame: Assessed from randomization every 12 weeks following the progression event used for PFS and the start of the next-line anticancer therapy. The endpoint was followed up for 479 days (approx 16 months) at minimum and 913 days (approx 30 months) at maximum.

  7. Change From Baseline in BPI-SF Pain Severity and Pain Interference

    All BPI-SF pain items including "worst pain" are scored on a 0-10 numeric rating scale (NRS) with 0=No Pain and 10=Worst Pain Imaginable. The pain severity domain consists of 4 items (item #3, item #4, item #5, and item #6) which assess pain at its "worst," "least," "average," and "now" (current pain) respectively on the 11-point NRS. The overall pain severity score is calculated for each patient/visit as the mean of the individual non-missing items. The pain interference domain score is a mean of 7 items: general activity (item #9A), mood (item #9B), walking ability (item #9C), normal work (item #9D), relations with other people (item #9E), sleep (item #9F), and enjoyment of life (item #9G), each scored on an 11-point NRS from 0 (Does not interfere) to 10 (Completely interferes). BPI-SF worst pain, pain severity and pain interference score changes can be a minimum of -10 and a maximum of 10. A negative change from baseline value indicates improvement.

    Time frame: Assessed from date of first subject randomised: 23Jul2021 to data cut off (China DCO): 22Jan2024 (913 days). BPI-SF were completed by patients daily for 7 consecutive days every 4 weeks. Change from baseline is reported every 4 weeks until week 49.

  8. Change From Baseline in Functional Assessment of Cancer Therapy- Prostate Cancer (FACT-P)

    The following measures are calculated from the FACT-P questionnaire, the resulting value is the total score for the associated questions or scaled scores: * Physical well-being subscale (PWB) (Questions GP1 to GP7) * Social/family well-being subscale (SWB) (Questions GS1 to GS7) * Emotional well-being subscale (EWB) (Questions GE1 to GE6) * Functional well-being subscale (FWB) (Questions GF1 to GF7) * Prostate cancer subscale (PCS) (Questions C2, C6, P1 to P8, BL2 and BL5) The scores range from 0 ("Not at all") to 4 ("Very much") for positively phrased questions, and from 0 ("Very much") to 4 ("Not at all") for negatively phrased questions. Total FACT-P score is the sum of PWB, SWB, EWB, FWB and PCS. FACT-P total score changes can be a minimum of -156 and a maximum of 156. A positive value indicates improvement. FACT-G total score is the sum of PWB, SWB, EWB and FWB. FACT-G Total score changes can be a minimum of -108 and a maximum of 108. A positive value indicates improvement.

    Time frame: Assessed from date of first subject randomised: 23Jul2021 to data cut off (China DCO): 22Jan2024 (913 days). FACT-P were assessed every 4 weeks from Day 1 until Week 52. Change from baseline is reported every 4 weeks until week 49.

07

Results

Posted Jun 29, 2025
Limitations and caveats
The study treatment period overlapped with the COVID-19 global pandemic caused by SARS-CoV-2 and declared by the World Health Organization on 11 March 2020. 55 patients had a visit impacted by the COVID-19 pandemic.

Participant flow

Approximately 108 patients were planned to be randomized in the study. Actually 162 patients were screened, and 110 patients were randomized successfully.

Participant flow — Overall Study
MilestoneOlaparib 300 mg bd + Abiraterone 1000 mg qdPlacebo bd + Abiraterone 1000 mg qd
Started5456
Completed3640
Not completed1816
Withdrew: Death1816

Outcome measures

PrimaryRadiological Progression Free Survival (rPFS)

Radiological progression free survival is defined as the time from randomisation until the earlier date of radiological progression or death (by any cause in the absence of progression), regardless of whether the patient withdraws from randomised therapy or receives another anticancer therapy prior to progression. Per RECIST v1.1, progression is defined as the sum of TLs has a 20% and absolute ≥ 5mm increase from nadir, and/or unequivocal progression in any non target lesions, and/or any new lesion identified. Per PCWG3, progression on a bone scan is defined as 2 or more new lesions observed from the first visit after baseline compared to baseline, or from all other visits compared to first visit after baseline. A confirmatory scan is required.

Time frame:
Tumour imaging CT/MRI and bone scan were assessed every 8 weeks from randomisation to week 24 and then every 12 weeks until RECIST progression. Patients were followed up for 479 days (approx 16 months) at minimum and 913 days (approx 30 months) at maximum
Reported as:
Median · Months
Radiological Progression Free Survival (rPFS)
MonthsOlaparib 300 mg bd + Abiraterone 1000 mg qdPlacebo bd + Abiraterone 1000 mg qd
Radiological Progression Free Survival (rPFS)14.75 (12.06 to 22.11)NA (NA to NA)
Statistical analysis
  • Olaparib 300 mg bd + Abiraterone 1000 mg qd vs Placebo bd + Abiraterone 1000 mg qd · Log Rank · p = 0.2592 (Nominal p-value) · Hazard ratio (hr): 1.43 · 95% CI 0.83 to 2.48HR and CI calculated using Cox Proportional Hazards model, where a HR \< 1 favours olaparib+abiraterone. Stratification factors are the same as those used in the stratified log-rank test.
SecondaryOverall Survival (OS)

Overall survival is defined as the time from date of randomisation to death due to any cause regardless of whether the patient withdraws from randomised therapy or receives another anticancer therapy. The 22Jan2024 DCO is the final data cut-off for the OS analysis and therefore no further updates will be made.

Time frame:
Assessed every 12 weeks from randomisation until death or data cut-off. The endpoint was followed up for 479 days (approx 16 months) at minimum and 913 days (approx 30 months) at maximum.
Reported as:
Median · Months
Overall Survival (OS)
MonthsOlaparib 300 mg bd + Abiraterone 1000 mg qdPlacebo bd + Abiraterone 1000 mg qd
Overall Survival (OS)27.83 (27.83 to NA)NA (NA to NA)
Statistical analysis
  • Olaparib 300 mg bd + Abiraterone 1000 mg qd vs Placebo bd + Abiraterone 1000 mg qd · Log Rank · p = 0.7251 (Nominal p-value) · Hazard ratio (hr): 1.14 · 95% CI 0.57 to 2.29HR and CI calculated using Cox Proportional Hazards model, where a HR \< 1 favours olaparib+abiraterone. Stratification factors are the same as those used in the stratified log-rank test.
SecondaryTime to First Subsequent Anticancer Therapy or Death (TFST)

Time to first subsequent anticancer therapy (excluding radiotherapy) is defined as the time from randomisation to the earlier of start date of the first subsequent anti cancer therapy after discontinuation of randomised treatment or death from any cause.

Time frame:
Assessed from from randomization on 30 day follow-up after last dose of study medication and every 12 weeks after that until DCO. The endpoint was followed up for 479 days (approx 16 months) at minimum and 913 days (approx 30 months) at maximum.
Reported as:
Median · Months
Time to First Subsequent Anticancer Therapy or Death (TFST)
MonthsOlaparib 300 mg bd + Abiraterone 1000 mg qdPlacebo bd + Abiraterone 1000 mg qd
Time to First Subsequent Anticancer Therapy or Death (TFST)19.1 (15.4 to NA)17.6 (10.6 to NA)
Statistical analysis
  • Olaparib 300 mg bd + Abiraterone 1000 mg qd vs Placebo bd + Abiraterone 1000 mg qd · Log Rank · p = 0.9715 (Nominal p-value) · Hazard ratio (hr): 0.99 · 95% CI 0.60 to 1.64HR and CI calculated using Cox Proportional Hazards model, where a HR \< 1 favours olaparib+abiraterone. Stratification factors are the same as those used in the stratified log-rank test.
SecondaryTime to Pain Progression (TTPP)

Time to pain progression is defined as time from randomisation to pain progression based on the Brief Pain Inventory-Short Form (BPI-SF) Item 3 "worst pain in 24 hours" (range 0-10, a higher score indicates worse pain) and opiate analgesic use (Analgesic quantification algorithm \[AQA\] score, range 0-7, a higher score indicates increased opioid use). For patients who are asymptomatic at baseline: A ≥2 point change from baseline in average (4-7 days) worst pain score observed at 2 consecutive visits or initiation of opioid use; For patients who are symptomatic at baseline: A ≥2 point change from baseline in average (4-7 days) worst pain score observed at 2 consecutive visits and an average worst pain score ≥4, and no decrease in average opioid use (≥1-point decrease in AQA score from a starting value of ≥2), or increase in opioid use (≥1-point increase, or ≥2-point increase if the starting value is 0) at 2 consecutive follow-up visits.

Time frame:
The BPI-SF and AQA were assessed on screening, day 1, day 15, day 29, day 43, day 57, day 71, and every 4 weeks after week 13 until DCO. The endpoint was followed up for 479 days (approx 16 months) at minimum and 913 days (approx 30 months) at maximum.
Reported as:
Median · Months
Time to Pain Progression (TTPP)
MonthsOlaparib 300 mg bd + Abiraterone 1000 mg qdPlacebo bd + Abiraterone 1000 mg qd
Time to Pain Progression (TTPP)NA (NA to NA)NA (NA to NA)
Statistical analysis
  • Olaparib 300 mg bd + Abiraterone 1000 mg qd vs Placebo bd + Abiraterone 1000 mg qd · Log Rank · p = 0.4937 (Nominal p-value) · Hazard ratio (hr): 0.68 · 95% CI 0.20 to 2.06HR and CI calculated using Cox Proportional Hazards model, where a HR \< 1 favours olaparib+abiraterone. Stratification factors are the same as those used in the stratified log-rank test.
SecondaryTime to Opiate Use

Time to opiate use is defined as the time from date of randomisation to the date of first opiate use for cancer related pain.

Time frame:
Assessed on screening, days 1, 29, and 57, every 4 weeks after week 13, treatment discontinuation, and 30-day follow-up after last dose of study medication. Followed up for 479 days (approx 16 months) at minimum and 913 days (approx 30 months) at maximum.
Reported as:
Median · Months
Time to Opiate Use
MonthsOlaparib 300 mg bd + Abiraterone 1000 mg qdPlacebo bd + Abiraterone 1000 mg qd
Time to Opiate UseNA (NA to NA)NA (NA to NA)
Statistical analysis
  • Olaparib 300 mg bd + Abiraterone 1000 mg qd vs Placebo bd + Abiraterone 1000 mg qd · Log Rank · p = 0.4923 (Nominal p-value) · Hazard ratio (hr): 1.65 · 95% CI 0.61 to 4.87HR and CI calculated using Cox Proportional Hazards model, where a HR \< 1 favours olaparib+abiraterone. Stratification factors are the same as those used in the stratified log-rank test.
SecondaryTime to a Symptomatic Skeletal-Related Event (SSRE)

Time from date of randomisation to date of first symptomatic skeletal-related event as defined by any of the following or a combination: * Use of radiation therapy to prevent or relieve skeletal symptoms. * Occurrence of new symptomatic pathological bone fractures (vertebral or non-vertebral). * Occurrence of spinal cord compression. * Orthopaedic surgical intervention for bone metastasis.

Time frame:
Assessed at every visit from randomisation up to and including treatment discontinuation visit. The endpoint was followed up for 479 days (approx 16 months) at minimum and 913 days (approx 30 months) at maximum.
Reported as:
Median · Months
Time to a Symptomatic Skeletal-Related Event (SSRE)
MonthsOlaparib 300 mg bd + Abiraterone 1000 mg qdPlacebo bd + Abiraterone 1000 mg qd
Time to a Symptomatic Skeletal-Related Event (SSRE)NA (NA to NA)NA (NA to NA)
SecondaryTime to Second Progression or Death (PFS2)

The time to PFS2 is defined as the time from date of randomisation to date of second progression on next-line (immediately after study treatment) anticancer therapy or death, whichever occurs earlier.

Time frame:
Assessed from randomization every 12 weeks following the progression event used for PFS and the start of the next-line anticancer therapy. The endpoint was followed up for 479 days (approx 16 months) at minimum and 913 days (approx 30 months) at maximum.
Reported as:
Median · Months
Time to Second Progression or Death (PFS2)
MonthsOlaparib 300 mg bd + Abiraterone 1000 mg qdPlacebo bd + Abiraterone 1000 mg qd
Time to Second Progression or Death (PFS2)28.71 (NA to NA)NA (NA to NA)
Statistical analysis
  • Olaparib 300 mg bd + Abiraterone 1000 mg qd vs Placebo bd + Abiraterone 1000 mg qd · Log Rank · p = 0.3407 (Nominal p-value) · Hazard ratio (hr): 1.45 · 95% CI 0.63 to 3.39HR and CI calculated using Cox Proportional Hazards model, where a HR \< 1 favours olaparib+abiraterone. Stratification factors are the same as those used in the stratified log-rank test.
SecondaryChange From Baseline in BPI-SF Pain Severity and Pain Interference

All BPI-SF pain items including "worst pain" are scored on a 0-10 numeric rating scale (NRS) with 0=No Pain and 10=Worst Pain Imaginable. The pain severity domain consists of 4 items (item #3, item #4, item #5, and item #6) which assess pain at its "worst," "least," "average," and "now" (current pain) respectively on the 11-point NRS. The overall pain severity score is calculated for each patient/visit as the mean of the individual non-missing items. The pain interference domain score is a mean of 7 items: general activity (item #9A), mood (item #9B), walking ability (item #9C), normal work (item #9D), relations with other people (item #9E), sleep (item #9F), and enjoyment of life (item #9G), each scored on an 11-point NRS from 0 (Does not interfere) to 10 (Completely interferes). BPI-SF worst pain, pain severity and pain interference score changes can be a minimum of -10 and a maximum of 10. A negative change from baseline value indicates improvement.

Time frame:
Assessed from date of first subject randomised: 23Jul2021 to data cut off (China DCO): 22Jan2024 (913 days). BPI-SF were completed by patients daily for 7 consecutive days every 4 weeks. Change from baseline is reported every 4 weeks until week 49.
Reported as:
Mean · Score
Change From Baseline in BPI-SF Pain Severity and Pain Interference
ScoreOlaparib 300 mg bd + Abiraterone 1000 mg qdPlacebo bd + Abiraterone 1000 mg qd
Change from baseline in BPI-SF worst pain - Week 5-0.70 (-1.25 to -0.15)-0.66 (-1.13 to -0.19)
Change from baseline in BPI-SF worst pain - Week 9-1.37 (-2.05 to -0.69)-0.61 (-1.11 to -0.12)
Change from baseline in BPI-SF worst pain - Week 13-1.42 (-2.16 to -0.69)-0.35 (-0.69 to -0.01)
Change from baseline in BPI-SF worst pain - Week 17-1.22 (-2.01 to -0.43)-0.38 (-0.94 to 0.18)
Change from baseline in BPI-SF worst pain - Week 21-1.06 (-1.71 to -0.40)-0.63 (-1.20 to -0.06)
Change from baseline in BPI-SF worst pain - Week 25-0.95 (-1.63 to -0.27)-0.74 (-1.33 to -0.16)
Change from baseline in BPI-SF worst pain - Week 29-1.24 (-1.88 to -0.60)-0.26 (-0.84 to 0.33)
Change from baseline in BPI-SF worst pain - Week 33-0.78 (-1.66 to 0.09)-0.66 (-1.31 to -0.01)
Change from baseline in BPI-SF worst pain - Week 37-0.61 (-1.25 to 0.03)-0.59 (-1.19 to 0.02)
Change from baseline in BPI-SF worst pain - Week 41-0.10 (-1.09 to 0.88)-0.43 (-0.97 to 0.10)
Change from baseline in BPI-SF worst pain - Week 45-0.46 (-1.47 to 0.56)-0.19 (-0.74 to 0.36)
Change from baseline in BPI-SF worst pain - Week 490.11 (-0.81 to 1.02)-0.06 (-0.59 to 0.47)
Change from baseline in BPI-SF overall pain severity score - Week 5-0.51 (-0.98 to -0.05)-0.56 (-0.98 to -0.13)
Change from baseline in BPI-SF overall pain severity score - Week 9-1.12 (-1.65 to -0.60)-0.54 (-1.00 to -0.08)
Change from baseline in BPI-SF overall pain severity score - Week 13-1.21 (-1.78 to -0.63)-0.31 (-0.60 to -0.02)
Change from baseline in BPI-SF overall pain severity score - Week 17-1.02 (-1.67 to -0.38)-0.34 (-0.85 to 0.16)
Change from baseline in BPI-SF overall pain severity score - Week 21-0.87 (-1.39 to -0.35)-0.57 (-1.09 to -0.06)
Change from baseline in BPI-SF overall pain severity score - Week 25-0.81 (-1.37 to -0.25)-0.68 (-1.22 to -0.14)
Change from baseline in BPI-SF overall pain severity score - Week 29-0.94 (-1.46 to -0.42)-0.26 (-0.71 to 0.18)
Change from baseline in BPI-SF overall pain severity score - Week 33-0.72 (-1.36 to -0.08)-0.63 (-1.20 to -0.06)
Change from baseline in BPI-SF overall pain severity score - Week 37-0.43 (-0.90 to 0.03)-0.51 (-0.94 to -0.08)
Change from baseline in BPI-SF overall pain severity score - Week 41-0.19 (-0.74 to 0.36)-0.42 (-0.83 to -0.01)
Change from baseline in BPI-SF overall pain severity score - Week 45-0.45 (-1.12 to 0.22)-0.26 (-0.65 to 0.12)
Change from baseline in BPI-SF overall pain severity score - Week 49-0.01 (-0.52 to 0.50)-0.21 (-0.64 to 0.21)
Change from baseline in BPI-SF overall pain interference score - Week 5-0.21 (-0.75 to 0.33)-0.30 (-0.71 to 0.12)
Change from baseline in BPI-SF overall pain interference score - Week 9-0.88 (-1.41 to -0.35)-0.33 (-0.83 to 0.17)
Change from baseline in BPI-SF overall pain interference score - Week 13-0.98 (-1.53 to -0.42)-0.14 (-0.44 to 0.15)
Change from baseline in BPI-SF overall pain interference score - Week 17-0.83 (-1.47 to -0.19)-0.16 (-0.68 to 0.37)
Change from baseline in BPI-SF overall pain interference score - Week 21-0.70 (-1.24 to -0.15)-0.31 (-0.84 to 0.21)
Change from baseline in BPI-SF overall pain interference score - Week 25-0.53 (-1.14 to 0.09)-0.42 (-0.97 to 0.13)
Change from baseline in BPI-SF overall pain interference score - Week 29-0.78 (-1.33 to -0.23)0.02 (-0.37 to 0.42)
Change from baseline in BPI-SF overall pain interference score - Week 33-0.70 (-1.43 to 0.03)-0.35 (-0.94 to 0.24)
Change from baseline in BPI-SF overall pain interference score - Week 37-0.21 (-0.68 to 0.26)-0.09 (-0.50 to 0.31)
Change from baseline in BPI-SF overall pain interference score - Week 41-0.05 (-0.59 to 0.49)-0.18 (-0.57 to 0.21)
Change from baseline in BPI-SF overall pain interference score - Week 45-0.36 (-1.01 to 0.30)-0.13 (-0.52 to 0.26)
Change from baseline in BPI-SF overall pain interference score - Week 490.09 (-0.39 to 0.57)-0.15 (-0.56 to 0.26)
SecondaryChange From Baseline in Functional Assessment of Cancer Therapy- Prostate Cancer (FACT-P)

The following measures are calculated from the FACT-P questionnaire, the resulting value is the total score for the associated questions or scaled scores: * Physical well-being subscale (PWB) (Questions GP1 to GP7) * Social/family well-being subscale (SWB) (Questions GS1 to GS7) * Emotional well-being subscale (EWB) (Questions GE1 to GE6) * Functional well-being subscale (FWB) (Questions GF1 to GF7) * Prostate cancer subscale (PCS) (Questions C2, C6, P1 to P8, BL2 and BL5) The scores range from 0 ("Not at all") to 4 ("Very much") for positively phrased questions, and from 0 ("Very much") to 4 ("Not at all") for negatively phrased questions. Total FACT-P score is the sum of PWB, SWB, EWB, FWB and PCS. FACT-P total score changes can be a minimum of -156 and a maximum of 156. A positive value indicates improvement. FACT-G total score is the sum of PWB, SWB, EWB and FWB. FACT-G Total score changes can be a minimum of -108 and a maximum of 108. A positive value indicates improvement.

Time frame:
Assessed from date of first subject randomised: 23Jul2021 to data cut off (China DCO): 22Jan2024 (913 days). FACT-P were assessed every 4 weeks from Day 1 until Week 52. Change from baseline is reported every 4 weeks until week 49.
Reported as:
Mean · Score
Change From Baseline in Functional Assessment of Cancer Therapy- Prostate Cancer (FACT-P)
ScoreOlaparib 300 mg bd + Abiraterone 1000 mg qdPlacebo bd + Abiraterone 1000 mg qd
Change from baseline in FACT-P Total - Week 5-4.43 (-11.40 to 2.54)-0.84 (-4.92 to 3.25)
Change from baseline in FACT-P Total - Week 9-4.95 (-12.69 to 2.79)1.00 (-4.80 to 6.79)
Change from baseline in FACT-P Total - Week 13-1.51 (-7.95 to 4.92)-3.07 (-8.49 to 2.36)
Change from baseline in FACT-P Total - Week 17-1.82 (-10.00 to 6.36)-3.51 (-9.63 to 2.60)
Change from baseline in FACT-P Total - Week 21-6.60 (-15.08 to 1.88)-0.54 (-7.07 to 6.00)
Change from baseline in FACT-P Total - Week 25-6.55 (-16.46 to 3.36)-1.68 (-8.30 to 4.95)
Change from baseline in FACT-P Total - Week 29-1.32 (-11.86 to 9.22)0.62 (-6.28 to 7.53)
Change from baseline in FACT-P Total - Week 33-7.23 (-17.13 to 2.68)-0.75 (-6.97 to 5.46)
Change from baseline in FACT-P Total - Week 37-3.21 (-11.48 to 5.07)-4.87 (-11.95 to 2.22)
Change from baseline in FACT-P Total - Week 41-7.16 (-15.95 to 1.63)0.47 (-6.04 to 6.99)
Change from baseline in FACT-P Total - Week 45-8.28 (-17.49 to 0.92)-1.69 (-7.76 to 4.39)
Change from baseline in FACT-P Total - Week 49-9.78 (-17.36 to -2.21)-1.35 (-6.72 to 4.02)
Change from baseline in FACT-G Total - Week 5-4.85 (-9.84 to 0.14)-1.75 (-4.92 to 1.42)
Change from baseline in FACT-G Total - Week 9-4.55 (-10.27 to 1.17)-0.07 (-3.80 to 3.66)
Change from baseline in FACT-G Total - Week 13-2.43 (-6.97 to 2.11)-3.79 (-7.41 to -0.16)
Change from baseline in FACT-G Total - Week 17-2.45 (-8.19 to 3.29)-4.30 (-7.98 to -0.62)
Change from baseline in FACT-G Total - Week 21-5.26 (-11.49 to 0.98)-2.10 (-6.40 to 2.20)
Change from baseline in FACT-G Total - Week 25-6.23 (-13.50 to 1.04)-3.45 (-8.39 to 1.49)
Change from baseline in FACT-G Total - Week 29-2.26 (-10.15 to 5.63)-1.35 (-6.27 to 3.57)
Change from baseline in FACT-G Total - Week 33-6.15 (-13.40 to 1.09)-2.75 (-7.38 to 1.87)
Change from baseline in FACT-G Total - Week 37-1.32 (-7.26 to 4.62)-5.14 (-10.32 to 0.04)
Change from baseline in FACT-G Total - Week 41-5.72 (-12.30 to 0.86)-1.08 (-5.90 to 3.75)
Change from baseline in FACT-G Total - Week 45-5.70 (-12.48 to 1.08)-2.27 (-6.78 to 2.24)
Change from baseline in FACT-G Total - Week 49-7.78 (-13.34 to -2.22)-1.51 (-5.13 to 2.11)

Adverse events

Collected over Adverse events with an onset date, or worsen, on or after the date of first dose and up to and including 30 days following discontinuation of randomised treatment. Assessed from date of randomisation to data cut off (China DCO): 22Jan2024 (Approx. 2 years 7 months). Non-serious events are listed at a 5% frequency threshold.

Adverse event summary by group
GroupDeathsSeriousOther
Olaparib 300 mg bd + Abiraterone 1000 mg qd18/54 (33.3%)23/54 (42.6%)53/54 (98.1%)
Placebo bd + Abiraterone 1000 mg qd16/56 (28.6%)21/56 (37.5%)54/56 (96.4%)
Most frequent serious events
Showing 10 of 54
Most frequent serious events
EventOlaparib 300 mg bd + Abiraterone 1000 mg qdPlacebo bd + Abiraterone 1000 mg qd
PneumoniaInfections and infestations4/540/56
CataractEye disorders2/540/56
DeathGeneral disorders2/541/56
Covid-19Infections and infestations2/542/56
Urinary tract infectionInfections and infestations2/540/56
Type 2 diabetes mellitusMetabolism and nutrition disorders0/542/56
Abdominal painGastrointestinal disorders1/540/56
DuodenitisGastrointestinal disorders1/540/56
Gastric ulcerGastrointestinal disorders1/540/56
Gastritis erosiveGastrointestinal disorders1/540/56
Most frequent other events
Showing 10 of 59
Most frequent other events
EventOlaparib 300 mg bd + Abiraterone 1000 mg qdPlacebo bd + Abiraterone 1000 mg qd
AnaemiaBlood and lymphatic system disorders42/5418/56
Blood bilirubin increasedInvestigations14/5415/56
Alanine aminotransferase increasedInvestigations11/5414/56
Lymphocyte count decreasedInvestigations13/545/56
HyperlipidaemiaMetabolism and nutrition disorders9/5413/56
HypokalaemiaMetabolism and nutrition disorders7/5413/56
HypercholesterolaemiaMetabolism and nutrition disorders10/5412/56
Aspartate aminotransferase increasedInvestigations11/5411/56
White blood cell count decreasedInvestigations11/543/56
HypertriglyceridaemiaMetabolism and nutrition disorders11/5411/56

Baseline characteristics

Full analysis set

Age, Continuous
Age, Continuous(Years)Olaparib 300 mg bd + Abiraterone 1000 mg qdPlacebo bd + Abiraterone 1000 mg qdTotal
Mean69.5 ± 8.268.9 ± 7.669.2 ± 7.9
Age, Customized
Age, Customized(Participants)Olaparib 300 mg bd + Abiraterone 1000 mg qdPlacebo bd + Abiraterone 1000 mg qdTotal
<65131730
>=65413980
Sex/Gender, Customized
Sex/Gender, Customized(Participants)Olaparib 300 mg bd + Abiraterone 1000 mg qdPlacebo bd + Abiraterone 1000 mg qdTotal
Male5456110
Race/Ethnicity, Customized
Race/Ethnicity, Customized(Participants)Olaparib 300 mg bd + Abiraterone 1000 mg qdPlacebo bd + Abiraterone 1000 mg qdTotal
HISPANIC OR LATINO000
NOT HISPANIC OR LATINO5456110
NOT REPORTED000
Race/Ethnicity, Customized
Race/Ethnicity, Customized(Participants)Olaparib 300 mg bd + Abiraterone 1000 mg qdPlacebo bd + Abiraterone 1000 mg qdTotal
ASIAN5456110
Region of Enrollment
Region of Enrollment(Participants)Olaparib 300 mg bd + Abiraterone 1000 mg qdPlacebo bd + Abiraterone 1000 mg qdTotal
China5456110
08

Study locations

26 sites
  • Research Site
    Beijing, 100034, China
  • Research Site
    Beijing, 100050, China
  • Research Site
    Beijing, 100142, China
  • Research Site
    Beijing, 100191, China
  • Research Site
    Beijing, 100730, China
  • Research Site
    Chongqing, 400038, China
  • Research Site
    Guangzhou, 510180, China
  • Research Site
    Guangzhou, 510515, China
  • Research Site
    Guizhou, 550002, China
  • Research Site
    Henan, 450008, China
  • Research Site
    Hubei, 430030, China
  • Research Site
    Hunan, 410008, China
  • Research Site
    Hunan, 410013, China
  • Research Site
    Jilin City, 130012, China
  • Research Site
    Jilin City, 130021, China
  • Research Site
    Liaoning, 110001, China
  • Research Site
    Nanchang, 330006, China
  • Research Site
    Nanjing, 2100008, China
  • Research Site
    Ningbo, 315000, China
  • Research Site
    Shanghai, 200032, China
  • Research Site
    Shanghai, 200040, China
  • Research Site
    Sichuan, 610041, China
  • Research Site
    Sichuan, 610072, China
  • Research Site
    Xi'an, 710061, China
  • Research Site
    Zhejiang, 310009, China
  • Research Site
    Zhejiang, 310014, China
09

References and documents

Study documents

  • Study protocol · Jan 30, 2024
  • Statistical analysis plan · May 21, 2021

Documents are hosted by the registry — open the source record to download them.

10

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Aug 28, 2026, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
11

Registry details

Key details

Study ID
NCT05171816
Lead sponsor
AstraZeneca
Collaborators
Merck Sharp & Dohme LLC
Responsible party
Sponsor
First posted
Dec 29, 2021
Start date
Jun 24, 2021
Primary completion
Jan 22, 2024
Completion
Feb 5, 2027 (estimated)
Results posted
Jun 29, 2025
Last update
Aug 28, 2026

Study contacts

Noel Clarke, M.D.
principal investigator · Christie Hospital Foundation Trust
Fred Saad, MD
principal investigator · University of Montreal Hospital Center

Oversight

Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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