Skip to content

Pembrolizumab/Placebo Plus Paclitaxel With or Without Bevacizumab for Platinum-resistant Recurrent Ovarian Cancer (MK-3475-B96/KEYNOTE-B96/ENGOT-ov65).

A Phase 3, Randomized, Double-Blind Study of Pembrolizumab Versus Placebo in Combination With Paclitaxel With or Without Bevacizumab for the Treatment of Platinum-resistant Recurrent Ovarian Cancer (KEYNOTE-B96/ENGOT-ov65)

Status
Active, not recruiting
Phases
Phase 3
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT05116189
Enrollment
643
Registered
2021-11-10
Start date
2021-12-13
Completion date
2027-07-16
Last updated
2026-03-09

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Ovarian Cancer, Carcinoma, Ovarian Epithelial, Fallopian Tube Neoplasms

Keywords

Programmed Cell Death-1 (PD1, PD-1), Programmed Death-Ligand 1 (PDL1, PD-L1)

Brief summary

The primary objective is to compare pembrolizumab plus paclitaxel with or without bevacizumab to placebo plus paclitaxel with or without bevacizumab, with respect to progression-free survival (PFS) per Response Evaluation Criteria in Solid Tumors (RECIST) 1.1 as assessed by the investigator. The hypotheses are that pembrolizumab plus paclitaxel with or without bevacizumab is superior to placebo plus paclitaxel with or without bevacizumab, with respect to PFS per RECIST 1.1 as assessed by the investigator for participants with programmed cell death ligand 1 (PD-L1) positive tumors (Combined Positive Score \[CPS\] ≥1) and that pembrolizumab plus paclitaxel with or without bevacizumab is superior to placebo plus paclitaxel with or without bevacizumab, with respect to PFS per RECIST 1.1 as assessed by the investigator for all participants.

Interventions

BIOLOGICALPembrolizumab

IV infusion

DRUGPaclitaxel

IV infusion

DRUGBevacizumab

IV infusion

DRUGDocetaxel

IV infusion

Sponsors

Merck Sharp & Dohme LLC
Lead SponsorINDUSTRY

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
TRIPLE (Subject, Investigator, Outcomes Assessor)

Eligibility

Sex/Gender
FEMALE
Age
18 Years to No maximum
Healthy volunteers
No

Inclusion criteria

* Has histologically confirmed epithelial ovarian, fallopian tube, or primary peritoneal carcinoma. * Has received 1 or 2 prior lines of systemic therapy for ovarian cancer (OC), including at least 1 prior platinum-based therapy. Participants may have received a prior poly (ADP-ribose) polymerase inhibitor (PARPi), anti-programmed cell death 1 protein (PD-1)/anti-programmed cell death ligand 1 (PD-L1) therapy, bevacizumab, or hormonal therapy; these will not be considered a separate line of therapy. Any chemotherapy regimen change due to toxicity in the absence of disease progression will be considered part of the same line of therapy. * Has provided documented informed consent for the study. * Has radiographic evidence of disease progression within 6 months (180 days) after the last dose of platinum-based chemotherapy for OC (i.e., platinum-resistant disease). * Is a candidate for paclitaxel chemotherapy (and bevacizumab, if using). * Has an Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 1 assessed within 3 days before randomization. * For a female participant, she is not pregnant or breastfeeding, and at least one of the following conditions applies: Is not a woman of childbearing potential (WOCBP) OR Is a WOCBP and uses a contraceptive method that is highly effective (with a failure rate of \<1% per year). * Has radiographically evaluable disease, either measurable or nonmeasurable per Response Evaluation Criteria In Solid Tumors (RECIST) 1.1, as assessed by the local site investigator. * Archival tumor tissue sample or newly obtained core or incisional/excisional biopsy of a tumor lesion not previously irradiated has been provided. * Have adequate organ function.

Exclusion criteria

* Has nonepithelial cancers, borderline tumors, mucinous, seromucinous that is predominantly mucinous, malignant Brenner's tumor and undifferentiated carcinoma. * Has primary platinum-refractory disease, defined as disease that has progressed per radiographic imaging while receiving or within 28 days of the last dose of first-line platinum-based therapy. * Has prior disease progression on weekly paclitaxel alone. * Has received \>2 prior lines of systemic therapy for OC. * Has received prior systemic anticancer therapy including investigational agents or maintenance therapy (including bevacizumab maintenance therapy), within 4 weeks before randomization. * Has received prior radiation therapy within 2 weeks of start of study intervention. * Has not recovered adequately from surgery and/or any complications from the surgery. * Has received colony-stimulating factors (e.g., granulocyte colony-stimulating factor \[G-CSF\], granulocyte-macrophage colony-stimulating factor,\[GM-CSF\] or recombinant erythropoietin) within 4 weeks before randomization. * Has received a live or live-attenuated vaccine within 30 days before the first dose of study intervention. * Has received investigational agent or has used an investigational device within 4 weeks prior to study intervention. * Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy. * Has a known additional malignancy that is progressing or has required active treatment within the past 3 years. * Has known active central nervous system (CNS) metastases and/or carcinomatous meningitis. * Has severe hypersensitivity (≥Grade 3) to pembrolizumab, paclitaxel, or bevacizumab (if using) and/or any of their excipients. * Has an active autoimmune disease that has required systemic treatment in the past 2 years. * Has a history of (noninfectious) pneumonitis/interstitial lung disease that required steroids or has current pneumonitis/interstitial lung disease. * Has an active infection requiring systemic therapy. * Has a known history of human immunodeficiency virus (HIV) infection. * Has a known history of Hepatitis B or known active Hepatitis C virus infection. * Has a history or current evidence of any condition, therapy, laboratory abnormality, or other circumstance that might confound the results of the study. * Has a known psychiatric or substance abuse disorder that would interfere with the participant's ability to cooperate with the requirements of the study. * Participant, in the judgement of the investigator, is unlikely to comply with the study procedures, restrictions, and requirements of the study. * Has had an allogenic tissue/solid organ transplant. For bevacizumab treatment * Has uncontrolled hypertension. * Has current, clinically relevant bowel obstruction including related to underlying epithelial OC, abdominal fistula or gastrointestinal perforation, intra-abdominal abscess, or evidence of rectosigmoid involvement by pelvic exam. * Has a history of thrombotic disorders, hemorrhage, hemoptysis, or active gastrointestinal bleeding within 6 months before randomization.

Design outcomes

Primary

MeasureTime frameDescription
Progression-Free Survival (PFS) Per Response Evaluation Criteria in Solid Tumors Version 1.1 (RECIST 1.1) as Assessed by the Investigator in Participants With Programmed Cell Death-Ligand 1 (PD-L1) Positive Tumors (Combined Positive Score [CPS] ≥1)Up to ~38 monthsPFS was defined as the time from randomization to the first documented progressive disease (PD) per RECIST 1.1 based on Investigator assessment 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. Per protocol, RECIST 1.1 was modified to allow up to 10 target lesions total (up to 5 per organ). The appearance of one or more lesions and the unequivocal progression of non-target lesions was also considered PD. Per protocol, PFS per RECIST 1.1 as assessed by the Investigator in participants with PD-L1 CPS ≥1 is reported here. PFS was calculated using the product-limit (Kaplan-Meier) method for censored data.
PFS Per RECIST 1.1 as Assessed by the Investigator in All ParticipantsUp to ~38 monthsPFS was defined as the time from randomization to the first documented progressive disease (PD) per RECIST 1.1 based on Investigator assessment 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. Per protocol, RECIST 1.1 was modified to allow up to 10 target lesions total (up to 5 per organ). The appearance of one or more lesions and the unequivocal progression of non-target lesions was also considered PD. PFS per RECIST 1.1 as assessed by the Investigator will be reported for all participants. PFS was calculated using the product-limit (Kaplan-Meier) method for censored data.

Secondary

MeasureTime frameDescription
PFS Per RECIST 1.1 by Blinded Independent Central Review (BICR) in Participants With PD-L1 CPS ≥1Up to ~38 monthsPFS is defined as the time from randomization to the first documented disease progression per RECIST 1.1 based on blinded independent central review assessment or death due to any cause, whichever occurs first. Per RECIST 1.1, PD is 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. The appearance of one or more lesions and the unequivocal progression of non-target lesions is also considered PD. The PFS per RECIST 1.1 as assessed by blinded independent central review (BICR) in participants with PD-L1 CPS ≥1 is reported here. PFS was calculated using the product-limit (Kaplan-Meier) method for censored data.
PFS Per RECIST 1.1 by Blinded Independent Central Review (BICR) in All ParticipantsUp to ~38 monthsPFS is defined as the time from randomization to the first documented disease progression per RECIST 1.1 based on blinded independent central review assessment or death due to any cause, whichever occurs first. Per RECIST 1.1, PD is 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. Per protocol, RECIST 1.1 was modified to allow up to 10 target lesions total (up to 5 per organ). The appearance of one or more lesions and the unequivocal progression of non-target lesions is also considered PD. The PFS per RECIST 1.1 as assessed by blinded independent central review (BICR) in all participants is reported here. PFS was calculated using the product-limit (Kaplan-Meier) method for censored data.
Overall Survival (OS)Up to ~64 monthsOS is defined as the time from the date of randomization to death due to any cause. The OS will be reported for all participants.
Number of Participants Who Experience an Adverse Event (AE)Up to ~64 monthsAn AE is any untoward medical occurrence in a participant, temporally associated with the use of study treatment, whether or not considered related to the study treatment. The number of participants who experience an AE will be reported.
Number of Participants Who Discontinue Study Treatment Due to an AEUp to ~64 monthsAn AE is any untoward medical occurrence in a participant, temporally associated with the use of study treatment, whether or not considered related to the study treatment. The number of participants who discontinue study treatment due to an AE will be reported.
Change From Baseline in Global Health Status/Quality of Life (GHS/Qol) Score (Items 29 and 30) Using the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire-Core 30 (EORTC QLQ-C30)Baseline and up to ~64 monthsThe EORTC QLQ-C30 is a questionnaire to assess the overall quality of life of cancer patients. Participant responses to the questions "How would you rate your overall health during the past week?" and "How would you rate your overall quality of life during the past week?" are scored on a 7-point scale (1= Very poor to 7=Excellent). Using linear transformation, raw scores are standardized, so that scores range from 0 to 100. A higher score indicates a better overall health status. The change from baseline in EORTC QLQ-C30 Items 29 and 30 combined score will be presented.
Time to Deterioration (TTD) in the GHS/Qol Score (Items 29 and 30) Using the EORTC QLQ-C30Up to ~64 monthsTTD is defined as the time from Baseline to the first onset of a ≥10-point negative change (decrease) from Baseline in GHS (EORTC QLQ-C30 Items 29 and 30) score. Using linear transformation, raw scores are standardized, so that scores range from 0 to 100. The TTD, as assessed based on a ≥10-point negative change (decrease) from Baseline in GHS score, will be presented. A longer TTD indicates a better outcome.
Change From Baseline in the Abdominal and Gastrointestinal (GI) Symptoms Score (Items 31 to 36) Using the EORTC Quality of Life Questionnaire-Ovarian Cancer (QLQ-OV28) Abdominal/GI Symptom ScaleBaseline and up to ~64 monthsThe EORTC QLQ-OV28 is an abdominal and gastrointestinal questionnaire (items 31-36). Participant responses to the question "Did you have abdominal pain ?" are scored on a 4-point scale (1=Not at All to 4=Very Much). Using linear transformation, raw scores are standardized, so that scores range from 0 to 100. The change from baseline in abdominal and gastrointestinal symptoms (EORTC QLQ-LC28 Items 31-36) score will be presented. A lower score indicates a better outcome.
TTD in the Abdominal and GI Symptoms Score (Items 31 to 36) Using the EORTC QLQ-OV28 Abdominal/GI Symptom ScaleUp to ~64 monthsTTD is defined as the time from Baseline to the first onset of a ≥10-point negative change (decrease) from Baseline in GHS (EORTC QLQ-C28 Items 31-36) score. Using linear transformation, raw scores are standardized, so that scores range from 0 to 100. The TTD, as assessed based on a ≥10-point negative change (decrease) from Baseline in GHS score, will be presented. A longer TTD indicates a better outcome.

Countries

Australia, Belgium, Brazil, Canada, Chile, China, Colombia, Denmark, Finland, France, Germany, Ireland, Israel, Italy, Japan, Mexico, Netherlands, New Zealand, Norway, Poland, Russia, South Korea, Turkey (Türkiye), United Kingdom, United States

Contacts

STUDY_DIRECTORMedical Director

Merck Sharp & Dohme LLC

Baseline characteristics

Characteristic
Age, Continuous60.8 years
STANDARD_DEVIATION 10.3
Ethnicity (NIH/OMB)
Hispanic or Latino
98 Participants
Ethnicity (NIH/OMB)
Not Hispanic or Latino
516 Participants
Ethnicity (NIH/OMB)
Unknown or Not Reported
29 Participants
Geographic Region
European Union (EU)
149 Participants
Geographic Region
Rest of World (ROW)
143 Participants
Geographic Region
United States (US)
59 Participants
Investigator Choice to Use Bevacizumab
No
85 Participants
Investigator Choice to Use Bevacizumab
Yes
236 Participants
Programmed Cell Death-Ligand 1 (PD-L1) Combined Positive Score (CPS) Status
CPS <1
88 Participants
Programmed Cell Death-Ligand 1 (PD-L1) Combined Positive Score (CPS) Status
CPS ≥10
100 Participants
Programmed Cell Death-Ligand 1 (PD-L1) Combined Positive Score (CPS) Status
CPS 1 to <10
133 Participants
Race (NIH/OMB)
American Indian or Alaska Native
0 Participants
Race (NIH/OMB)
Asian
58 Participants
Race (NIH/OMB)
Black or African American
8 Participants
Race (NIH/OMB)
More than one race
17 Participants
Race (NIH/OMB)
Native Hawaiian or Other Pacific Islander
1 Participants
Race (NIH/OMB)
Unknown or Not Reported
22 Participants
Race (NIH/OMB)
White
424 Participants
Sex: Female, Male
Female
643 Participants
Sex: Female, Male
Male
0 Participants

Adverse events

Event typeEG000
affected / at risk
EG001
affected / at risk
deaths
Total, all-cause mortality
225 / 322244 / 321
other
Total, other adverse events
319 / 320307 / 318
serious
Total, serious adverse events
178 / 320122 / 318

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Mar 10, 2026