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Olaparib

Phase 3

Metastatic Colorectal Cancer | Small molecule | Oncology |Merck & Company, Inc.|Last Updated: Jul 6, 2026

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Trial Design
RandomizedACTIVE_CONTROLLEDDMC
Total Trials1
Total Enrollment335
FDA Designations
No designations recorded
Clinical trial landscape

Olaparib · 3 trials · 3 indications

Phase 3 1Phase 2 2
NCT04456699Efficacy and Safety of Olaparib (MK-7339) With or Without Bevacizumab Compared to Bevacizumab With a Fluoropyrimidine in Unresectable or Metastatic Colorectal Cancer (CRC) (MK-7339-003/LYNK-003)Metastatic Colorectal Cancer
COMPLETED335 Analytics
PHASE3COMPLETED
Efficacy and Safety of Olaparib (MK-7339) With or Without Bevacizumab Compared to Bevacizumab With a Fluoropyrimidine in Unresectable or Metastatic Colorectal Cancer (CRC) (MK-7339-003/LYNK-003)
Metastatic Colorectal CancerUnlock trial analytics
Study Endpoints
Primary Endpoints
Progression Free Survival (PFS) Per Response Evaluation Criteria in Solid Tumors Version (RECIST) 1.1 as Assessed by Blinded Independent Central Review (BICR)
Up to approximately 30 months

PFS was defined as the time from randomization to the first documented progressive disease (PD) or death due to any cause, whichever occurs first. Per RECIST 1.1, PD was defined as ≥20% increase in the sum of diameters of target lesions. In addition to the relative increase of 20%, the sum must also demonstrate an absolute increase of ≥5 mm. Note: The appearance of one or more new lesions was also considered PD. PFS using RECIST 1.1 as assessed by BICR is presented.

Objective Response Rate (ORR) as Assessed by Response Evaluation Criteria in Solid Tumors Version 1.1 (RECIST 1.1) or Prostate Cancer Working Group (PCWG)-modified RECIST 1.1 in Biomarker Subgroups
Up to ~3 years

ORR is defined as the percentage of participants who have a Complete Response (CR: Disappearance of all target lesions) or a Partial Response (PR: At least a 30% decrease in the sum of diameters of target lesions) per RECIST 1.1. The ORR for all participants will be presented by biomarker subgroup.

All Cohorts: Objective Response Rate (ORR) as Assessed by Blinded Independent Central Review (BICR) per Modified Response Evaluation Criteria in Solid Tumors Version 1.1 (RECIST 1.1) or Prostate Cancer Working Group (PCWG)-modified RECIST 1.1
Up to approximately 78 months

ORR was defined as the percentage of participants who have a confirmed Complete Response (CR: disappearance of all target lesions) or Partial Response (PR: At least a 30% decrease in the sum of diameters of target lesions) as assessed by the BICR per modified RECIST 1.1. For participants with prostate cancer, response will be assessed based on PCWG-modified RECIST 1.1 criteria (CR: no evidence of disease \[NED\] on bone scan; PR: non-progressive disease, non-evaluable \[NE\], NED, or CR on bone scan). Per protocol, RECIST 1.1 was modified to allow ≤ 10 target lesions in total (up to 5 per organ). The percentage of participants who experienced a CR or PR as assessed by BICR is presented.

Secondary Endpoints
Overall Survival (OS)
Up to approximately 30 months
Objective Response Rate (ORR) Per RECIST 1.1 as Assessed by BICR
Up to approximately 30 months
Number of Participants With One or More Adverse Events (AE)
Up to approximately 30 months
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Study Design & Arms
AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Olaparib + bevacizumabEXPERIMENTALParticipants will receive olaparib (300 mg twice daily \[BID\] oral) + Bevacizumab (5 mg/kg intravenous \[IV\] once every 2 weeks \[Q2W\]) until progressive disease or end of study.
OlaparibEXPERIMENTALParticipants will receive olaparib (300 mg BID) oral, until progressive disease or end of study.
Bevacizumab + chemotherapyACTIVE_COMPARATORParticipants will receive investigator's choice of either bevacizumab (7.5 mg/kg IV once every three weeks (Q3W)) + capecitabine (1000 mg/m\^2 BID for 14 days, then 7 days off, Q3W) or bevacizumab (5 mg/kg IV Q2W) + 5-FU (2400 mg/m2 IV over 46 to 48 hours Q2W; bolus 5-FU (400 mg/m2) can be added prior to infusional 5-FU, per local standards and at the investigator's discretion). Leucovorin or levoleucovorin 400 mg/m\^2 (leucovorin) or 200 mg/m\^2 (levoleucovorin) Q2W IV infusion may be added per investigator's discretion. Treatment will continue until progressive disease or end of study.
Olaparib+PembrolizumabEXPERIMENTALParticipants receive olaparib 300 mg via oral tablet 2 times each day PLUS pembrolizumab 200 mg via intravenous infusion on Day 1 of each 21-day cycle. Participants may receive olaparib+pembrolizumab for up to approximately 2 years.
Cohort 1: BRCA1/2EXPERIMENTALPer protocol, participants with tumors that harbor known or suspected deleterious mutations in breast cancer susceptibility gene 1 or gene 2 (BRCA1/2) based on the Lynparza homologous recombination repair-homologous recombination deficiency (HRR-HRD) Assay, excluding breast and ovarian cancers, were considered BRCA1/2 mutated and enrolled into Cohort 1: BRCA1/2. Participants with known or suspected deleterious mutations in BRCA1/BRCA2 were enrolled into Cohort 1 whether or not they were homologous recombination repair mutated (HRRm) positive for the other protocol specified genes in the Lynparza HRR-HRD Assay, or whether they had Loss of Heterozygosity (LOH) protocol specified score of ≥16. Participants in Cohort 1: BRCA1/2 received oral olaparib,300 mg twice daily (BID) continuously until documented disease progression or discontinuation criteria were met.
Cohort 2: HRD+, HRR Non-mutatedEXPERIMENTALPer protocol, participants with tumors that do NOT have any known or suspected deleterious mutations in BRCA1/2, or any of the protocol specified genes in the Lynparza HRR-HRD Assay (BRCA1/2 Non-mutated/HRR Non-mutated) but had a LOH score greater than or equal to the protocol specified cutoff of 16, were considered homologous recombination deficiency positive (HRD+) and enrolled into Cohort 2: HRD+(BRCA1/2 non-mutated/HRR Non-mutated). Participants in Cohort 2: HRD+ (BRCA1/2 Non-mutated/HRR Non-mutated) received oral olaparib, 300 mg BID continuously until documented disease progression or discontinuation criteria were met.
Cohort 2: HRRm, BRCA Non-mutatedEXPERIMENTALPer protocol, participants with tumors that do NOT have any known or suspected deleterious mutations in BRCA1/2 but have known or suspected deleterious mutations in any of the protocol specified genes in the Lynparza HRR-HRD Assay were considered homologous recombination repair mutated \[HRRm\] and were enrolled into Cohort 2: HRRm (BRCA1/2 Non-mutated). Participants in Cohort 2: HRRm (BRCA1/2 Non-mutated) received oral olaparib, 300 mg BID continuously until documented disease progression or discontinuation criteria were met.
Cohort 3: sBRCAm Breast CancerEXPERIMENTALPer protocol, participants with breast cancer tumors that harbor known or suspected deleterious somatic mutations in BRCA1/2 and do not harbor a germline BRCA1/2 mutation were enrolled into Cohort 3: somatic BRCA1/2 mutations (sBRCAm). Participants in Cohort3: sBRCAm Breast Cancer received oral olaparib, 300 mg BID continuously until documented disease progression or discontinuation criteria were met.
Interventions
NameTypeDescription
OlaparibDRUG300 mg BID, oral until progressive disease or end of study
5-FUDRUG2400 mg/m\^2 over 46 to 48 hours Q2W IV infusion until disease progression or end of study; bolus 5-FU (400mg/m2) can be added prior to infusional 5-FU, per local standards and at the investigator's discretion
BevacizumabDRUG5 mg/kg or 7.5 mg/kg Q2W or Q3W IV infusion until progressive disease or end of study
CapecitabineDRUG1000 mg/m\^2 oral capsule BID for 14 days, then 7 days off, Q3W) until progressive disease or end of study
Leucovorin/ levoleucovorinDRUG400 mg/m\^2 (leucovorin) or 200 mg/m\^2 (levoleucovorin) may be added to Bevacizumab + 5-FU per investigator's discretion Q2W IV infusion until progressive disease or end of study
PembrolizumabBIOLOGICALIntravenous infusion
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Eligibility Criteria
Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites129

Inclusion Criteria: 1. Has a histologically-confirmed metastatic or unresectable (Stage IV as defined by American Joint Committee on Cancer (AJCC eighth edition) colorectal adenocarcinoma (National Comprehensive Cancer Network \[NCCN\] 2018). 2. Has not progressed (ie, achieved a stable disease \[S...

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Competitive Landscape -Colorectal Cancer 259 trials (matched to "Metastatic Colorectal Cancer")
Recent Changes (Last 90 Days)
MEDIUMJul 6, 2026NCT03742895Completion: 2026-06-30 → 2027-06-30
MEDIUMJul 6, 2026NCT03742895Completion: 2026-06-30 → 2027-06-30
HIGHJun 23, 2026NCT04123366Status: ACTIVE_NOT_RECRUITING → COMPLETED
HIGHJun 23, 2026NCT04123366Status: ACTIVE_NOT_RECRUITING → COMPLETED
LOWMay 26, 2026NCT04123366primaryCompletionDate: changed
LOWMay 26, 2026NCT03742895Enrollment: 326 → 329
LOWMay 24, 2026NCT04123366studyFirstPostDate: changed
LOWMay 24, 2026NCT03742895studyFirstPostDate: changed