Study of Olaparib Plus Pembrolizumab Versus Chemotherapy Plus Pembrolizumab After Induction With First-Line Chemotherapy Plus Pembrolizumab in Triple Negative Breast Cancer (TNBC) (MK-7339-009/KEYLYNK-009)
An Open-label, Randomized, Phase 2/3 Study of Olaparib Plus Pembrolizumab Versus Chemotherapy Plus Pembrolizumab After Induction of Clinical Benefit With First-line Chemotherapy Plus Pembrolizumab in Participants With Locally Recurrent Inoperable or Metastatic Triple Negative Breast Cancer (TNBC) (KEYLYNK-009)
7 other identifiers
interventional
462
15 countries
122
Brief Summary
The purpose of this study is to compare the efficacy of olaparib (MK-7339) plus pembrolizumab (MK-3475) with chemotherapy plus pembrolizumab after induction with first-line chemotherapy plus pembrolizumab in triple negative breast cancer (TNBC). The primary hypotheses are:
- 1.Olaparib plus pembrolizumab is superior to chemotherapy plus pembrolizumab with respect to progression-free survival (PFS).
- 2.Olaparib plus pembrolizumab is superior to chemotherapy plus pembrolizumab with respect to overall survival (OS).
Trial Health
Trial Health Score
Automated assessment based on enrollment pace, timeline, and geographic reach
participants targeted
Target at P75+ for phase_2
Started Dec 2019
Longer than P75 for phase_2
122 active sites
Health score is calculated from publicly available data and should be used for screening purposes only.
Trial Relationships
Click on a node to explore related trials.
Study Timeline
Key milestones and dates
First Submitted
Initial submission to the registry
December 5, 2019
CompletedFirst Posted
Study publicly available on registry
December 9, 2019
CompletedStudy Start
First participant enrolled
December 19, 2019
CompletedPrimary Completion
Last participant's last visit for primary outcome
December 15, 2022
CompletedResults Posted
Study results publicly available
February 14, 2024
CompletedStudy Completion
Last participant's last visit for all outcomes
November 26, 2025
CompletedMarch 3, 2026
February 1, 2026
3 years
December 5, 2019
December 8, 2023
February 10, 2026
Conditions
Keywords
Outcome Measures
Primary Outcomes (2)
Progression-Free Survival (PFS)
PFS was defined as the time from randomization to the first documented progressive disease (PD) per Response Evaluation Criteria in Solid Tumors Version 1.1 (RECIST 1.1) as Assessed by Blinded Independent Central Review (BICR), or death due to any cause, whichever occurs first. Per RECIST 1.1, PD was defined as ≥20% increase in the sum of diameters (SOD) of target lesions. In addition to the relative increase of 20%, the sum had to demonstrate an absolute increase of ≥5 mm. The appearance of one or more new lesions was also considered PD. PFS is reported based on the product-limit (Kaplan-Meier) method for censored data.
Up to approximately 29 months
Overall Survival (OS)
OS was defined as the time from randomization to death due to any cause. Participants without documented death at the time of the final analysis were censored at the date of the last follow-up. OS is reported based on the product-limit (Kaplan-Meier) method for censored data.
Up to approximately 29 months
Secondary Outcomes (24)
Progression-Free Survival (PFS) in Participants With Programmed Cell Death-Ligand 1 (PD-L1) Positive Tumors With a Combined Positive Score (CPS) ≥10
Up to approximately 29 months
Overall Survival (OS) in Participants With PD-L1 Positive Tumors With a CPS ≥10
Up to approximately 29 months
PFS in Participants With Breast Cancer Susceptibility Gene Mutation (BRCAm) Tumors
Up to approximately 29 months
OS in Participants With BRCAm Tumors
Up to approximately 29 months
Change From Baseline in Health-Related Quality-of-Life (QoL) Using the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire Core 30 (EORTC QLQ-C30) Items 29 and 30 Combined Score
Baseline and week 18
- +19 more secondary outcomes
Study Arms (2)
Pembrolizumab + Olaparib
EXPERIMENTALThis arm includes participants who randomized following completion of the induction period. After the induction period, participants received pembrolizumab 200 mg intravenously on Day 1 of each 21-day cycle plus olaparib 300 mg orally twice daily during the post-induction period.
Pembrolizumab + Carboplatin + Gemcitabine
EXPERIMENTALThis arm includes participants who randomized following completion of the induction period. Participants continued to receive both carboplatin AUC 2 with gemcitabine 1000 mg/m\^2 intravenously on Days 1 and 8 of each 21-day cycle in addition to pembrolizumab 200 mg intravenously on Day 1 of each 21-day cycle in the post-induction period.
Interventions
intravenous (IV) infusion
oral tablets
Eligibility Criteria
You may qualify if:
- Induction Period:
- Has locally recurrent inoperable TNBC that has not previously been treated with chemotherapy and that cannot be treated with curative intent OR has metastatic TNBC that has not been previously treated with chemotherapy
- Has been treated with anthracycline and/or a taxane in the neoadjuvant/adjuvant setting, if they received systemic treatment in the neoadjuvant/adjuvant setting, unless anthracycline and/or taxane was contraindicated or not considered the best treatment option for the participant in the opinion of the treating physician
- Has measurable disease based on RECIST 1.1
- Has provided a recently obtained or archival (no more than 3 years old) core or excisional biopsy of a tumor lesion not previously irradiated
- Has an Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1 as assessed within 7 days prior to the start of induction study treatment
- Has a life expectancy ≥27 weeks from the day of first study treatment
- Demonstrate adequate organ function within 10 days prior to the start of study treatment
- A male participant must agree to be abstinent or use contraception and refrain from donating sperm during the intervention period and for at least the time needed to eliminate each study intervention (95 days for olaparib and chemotherapy; no requirement for pembrolizumab)
- A female participant must not be pregnant or breastfeeding and must agree to the following if is a woman of childbearing potential (WOCBP): have a negative pregnancy test within 24 hours before the start of study treatment and agree to be abstinent or use contraception and refrain from donating eggs (ova, oocytes) during the intervention period and for at least the time needed to eliminate each study intervention (180 days for olaparib and chemotherapy; 120 days for pembrolizumab)
- Post-induction Period:
- Has received up to 6 cycles but not less than 4 cycles of induction therapy without permanently discontinuing from pembrolizumab or both carboplatin and gemcitabine
- Has achieved complete response (CR), partial response (PR), or stable disease (SD) based on RECIST 1.1 by Blinded Independent Central Review (BICR) at the Week 18 evaluation
- Is able to complete during post-induction at least the Cycle 1, Day 1 doses of olaparib and pembrolizumab or the Cycle 1, Day 1 doses of at least one of the chemotherapy agents being administered at the end of induction (carboplatin and/or gemcitabine) in addition to pembrolizumab
- Has ECOG performance status of 0 or 1, as assessed within 7 days prior to the start of post-induction study treatment
- +1 more criteria
You may not qualify if:
- Induction Period:
- Has a known additional malignancy that is progressing or has required active treatment within the past 5 years with the exception of basal cell carcinoma of the skin, squamous cell carcinoma of the skin, or carcinoma in situ (eg, cervical cancer in situ) that have undergone potentially curative therapy
- Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior the first dose of study treatment
- Has an active autoimmune disease that has required systemic treatment in the past 2 years
- Has known active central nervous system (CNS) metastases and/or carcinomatous meningitis
- Has myelodysplastic syndrome (MDS)/acute myeloid leukemia (AML) or has features suggestive of MDS/AML
- Has a history of (non-infectious) pneumonitis\\interstitial lung disease that required steroids or current pneumonitis\\interstitial lung disease
- Has active, or a history of, interstitial lung disease
- Has a known history of active tuberculosis
- Has an active infection requiring systemic therapy
- Has a known history of human immunodeficiency virus (HIV) infection
- Has a known history of Hepatitis B (defined as Hepatitis B surface antigen \[HBsAg\] reactive) or known active Hepatitis C virus (defined as HCV RNA \[qualitative\] is detected) infection
- Has a history of class II-IV congestive heart failure or myocardial infarction within 6 months of first study treatment
- Has neuropathy ≥Grade 2
- Has not recovered (eg, to ≤Grade 1 or to baseline) from AEs due to a previously administered therapy
- +26 more criteria
Contact the study team to confirm eligibility.
Sponsors & Collaborators
Study Sites (122)
Pacific Cancer Care ( Site 0142)
Monterey, California, 93940, United States
UCSF Helen Diller Family Comprehensive Cancer Center ( Site 0138)
San Francisco, California, 94158, United States
John Wayne Cancer Institute ( Site 0111)
Santa Monica, California, 90404, United States
St. Joseph Heritage Healthcare ( Site 0104)
Santa Rosa, California, 95403, United States
University of Miami Sylvester CC ( Site 0146)
Miami, Florida, 33136, United States
Georgia Cancer Center at Augusta University ( Site 0129)
Augusta, Georgia, 30912, United States
University of Chicago ( Site 0159)
Chicago, Illinois, 60637, United States
Massachusetts General Hospital ( Site 0155)
Boston, Massachusetts, 02114, United States
Henry Ford Health System ( Site 0103)
Detroit, Michigan, 48202, United States
Virginia Piper Cancer Institute ( Site 0157)
Minneapolis, Minnesota, 55407, United States
Memorial Sloan Kettering Cancer Center- Monmouth ( Site 0161)
Middletown, New Jersey, 07748, United States
MSKCC-Bergen ( Site 0162)
Montvale, New Jersey, 07645, United States
Memorial Sloan-Kettering Cancer Center at Commack ( Site 0160)
Commack, New York, 11725, United States
Memorial Sloan-Kettering Cancer Center ( Site 0156)
New York, New York, 10065, United States
Mercy Clinic Oncology and Hematology ( Site 0110)
Oklahoma City, Oklahoma, 73120, United States
The Center For Cancer And Blood Disorders ( Site 0151)
Fort Worth, Texas, 76104, United States
Texas Oncology-New Braunfels ( Site 0168)
New Braunfels, Texas, 78130, United States
Texas Oncology-San Antonio Northeast ( Site 0165)
San Antonio, Texas, 78217, United States
Texas Oncology-San Antonio Medical Center ( Site 0158)
San Antonio, Texas, 78240, United States
Texas Oncology - San Antonio Stone Oak ( Site 0166)
San Antonio, Texas, 78258, United States
Renovatio Clinical ( Site 0117)
The Woodlands, Texas, 77380, United States
Virginia Oncology Associates ( Site 0163)
Newport News, Virginia, 23606, United States
Virginia Oncology Associates ( Site 0153)
Norfolk, Virginia, 23502, United States
Virginia Oncology Associates ( Site 0164)
Virginia Beach, Virginia, 23456, United States
YVMH dba Virginia Mason Memorial/North Star Lodge Cancer Center ( Site 0128)
Yakima, Washington, 98902, United States
Princess Margaret Cancer Centre ( Site 0005)
Toronto, Ontario, M5G 2M9, Canada
CSSS de Laval- Hopital de la Cite de la Sante ( Site 0011)
Laval, Quebec, H7M 3L9, Canada
Centre Hospitalier de l Universite de Montreal - CHUM ( Site 0003)
Montreal, Quebec, H2X 3E4, Canada
Jewish General Hospital ( Site 0010)
Montreal, Quebec, H3T 1E2, Canada
McGill University Health Centre ( Site 0002)
Montreal, Quebec, H4A 3J1, Canada
IC La Serena Research ( Site 0511)
La Serena, Coquimbo Region, 1720430, Chile
Fundacion Arturo Lopez Perez ( Site 0500)
Santiago, Region M. de Santiago, 7500921, Chile
Pontificia Universidad Catolica de Chile ( Site 0501)
Santiago, Region M. de Santiago, 8330032, Chile
Centro Investigación del Cáncer James Lind ( Site 0510)
Temuco, Región de la Araucanía, 4780000, Chile
Oncocentro ( Site 0502)
Viña del Mar, Región de Valparaíso, 2520598, Chile
Fundacion Colombiana de Cancerologia Clinica Vida ( Site 0601)
Medellín, Antioquia, 050030, Colombia
Clinica de la Costa Ltda. ( Site 0600)
Barranquilla, Atlántico, 080020, Colombia
Organizacion Clinica Bonnadona-Prevenir S.A.S. ( Site 0609)
Barranquilla, Atlántico, 080020, Colombia
Oncomedica S.A. ( Site 0606)
Montería, Departamento de Córdoba, 230002, Colombia
Fundacion Valle del Lili ( Site 0602)
Cali, Valle del Cauca Department, 760032, Colombia
Hemato Oncologos S.A. ( Site 0603)
Cali, Valle del Cauca Department, 760042, Colombia
Centre Francois Baclesse ( Site 1012)
Caen, Calvados, 14076, France
CHU-Jean Minjoz ( Site 1013)
Besançon, Doubs, 25030, France
Institut Claudius Regaud IUCT Oncopole ( Site 1001)
Toulouse, Haute-Garonne, 31059, France
Centre de Cancerologie du Grand Montpellier ( Site 1009)
Montpellier, Languedoc-Roussillon, 34070, France
CHR-METZ-THIONVILLE - Hopital de Mercy ( Site 1007)
Metz, Moselle, 57085, France
Centre Jean Perrin ( Site 1003)
Clermont-Ferrand, Puy-de-Dome, 63001, France
Centre Leon Berard ( Site 1018)
Lyon, Rhone, 69373, France
Centre Henri Becquerel ( Site 1020)
Rouen, Seine-Maritime, 76038, France
CHU Amiens Hopital Sud ( Site 1023)
Amiens, Somme, 80000, France
Institut Gustave Roussy ( Site 1010)
Villejuif, Val-de-Marne, 94805, France
Institut Sainte Catherine ( Site 1026)
Avignon, Vaucluse, 84918, France
Hôpital Saint-Louis ( Site 1025)
Paris, 75010, France
Universitaetsklinikum Mannheim GmbH ( Site 1213)
Mannheim, Baden-Wurttemberg, 68167, Germany
Universitaetsklinikum Erlangen ( Site 1201)
Erlangen, Bavaria, 91054, Germany
Klinik und Poliklinik fuer Frauenheilkunde und Geburtshilfe ( Site 1200)
Munich, Bavaria, 80337, Germany
Hochwaldkrankenhaus Bad Nauheim ( Site 1211)
Bad Nauheim, Hesse, 61231, Germany
Sana Klinikum Offenbach Klinik fuer Gynakologie und Geburtshilfe ( Site 1206)
Offenbach, Hesse, 63069, Germany
Gynaekologisch-onkologische Praxis Hannover ( Site 1207)
Hanover, Lower Saxony, 30177, Germany
Gynaekologisches Zentrum-Schwerpunkt Gyn. Onkologie ( Site 1205)
Bonn, North Rhine-Westphalia, 53111, Germany
Universitaetsklinikum AoeR Duesseldorf ( Site 1210)
Düsseldorf, North Rhine-Westphalia, 40225, Germany
Kliniken Essen-Mitte ( Site 1215)
Essen, North Rhine-Westphalia, 45136, Germany
Frauenklinik St. Louise ( Site 1216)
Paderborn, North Rhine-Westphalia, 33098, Germany
Universitaetsklinikum Carl Gustav Carus ( Site 1203)
Dresden, Saxony, 01307, Germany
Pecsi Tudomanyegyetem Klinikai Kozpont ( Site 1607)
Pécs, Baranya, 7624, Hungary
Bacs-Kiskun Megyei Korhaz-Onkoradiologiai Kozpont ( Site 1608)
Kecskemét, Bács-Kiskun county, 6000, Hungary
Jasz Nagykun Szolnok Megyei Hetenyi Geza Korhaz Rendelointezet ( Site 1601)
Szolnok, Jász-Nagykun-Szolnok, 5000, Hungary
Zala Megyei Szent Rafael Korhaz ( Site 1605)
Zalaegerszeg, Zala County, 8900, Hungary
Orszagos Onkologiai Intezet ( Site 1602)
Budapest, 1122, Hungary
Debreceni Egyetem Klinikai Kozpont ( Site 1600)
Debrecen, 4032, Hungary
Somogy Megyei Kaposi Mor Oktato Korhaz ( Site 1604)
Kaposvár, 7400, Hungary
Cork University Hospital ( Site 0902)
Cork, T12 DC4A, Ireland
St Vincents University Hospital ( Site 0900)
Dublin, D04 YN63, Ireland
Aichi Cancer Center Hospital ( Site 2202)
Nagoya, Aichi-ken, 464-8681, Japan
Hyogo College of Medicine Hospital ( Site 2203)
Nishinomiya, Hyōgo, 663-8501, Japan
Fukushima Medical University Hospital ( Site 2201)
Fukushima, 960-1295, Japan
Hiroshima City Hiroshima Citizens Hospital ( Site 2204)
Hiroshima, 730-8518, Japan
National Hospital Organization - Osaka National Hospital - Institute For Clinical Research (Site 2200)
Osaka, 540-0006, Japan
Pleszewskie Centrum Medyczne w Pleszewie Sp. z o.o. ( Site 1909)
Pleszew, Greater Poland Voivodeship, 65-300, Poland
Pratia MCM Krakow ( Site 1919)
Krakow, Lesser Poland Voivodeship, 30-510, Poland
Regionalny Szpital Specjalistyczny Latawiec ( Site 1917)
Swidnica, Lower Silesian Voivodeship, 58-100, Poland
Narodowy Instytut Onkologii im. Marii Sklodowskiej-Curie - Panstwowy Instytut Badawczy w Warszawie (Site 1908)
Warsaw, Masovian Voivodeship, 02-781, Poland
Szpital Morski im. PCK. Szpitale Pomorskie Sp. Z o.o ( Site 1913)
Gdynia, Pomeranian Voivodeship, 81-519, Poland
Narodowy Instytut Onkologii - Oddzial w Gliwicach ( Site 1912)
Gliwice, Silesian Voivodeship, 44-102, Poland
National Cancer Center ( Site 2406)
Goyang-si, Kyonggi-do, 10408, South Korea
Seoul National University Bundang Hospital ( Site 2409)
Seongnam-si, Kyonggi-do, 13605, South Korea
Ajou University Hospital ( Site 2407)
Suwon, Kyonggi-do, 16499, South Korea
Kyungpook National University Chilgok Hospital ( Site 2402)
Daegu, Taegu-Kwangyokshi, 41404, South Korea
Gachon University Gil Medical Center ( Site 2408)
Incheon, 21565, South Korea
Seoul National University Hospital ( Site 2403)
Seoul, 03080, South Korea
Severance Hospital Yonsei University Health System ( Site 2401)
Seoul, 03722, South Korea
Asan Medical Center ( Site 2404)
Seoul, 05505, South Korea
Samsung Medical Center ( Site 2405)
Seoul, 06351, South Korea
Hospital Universitario Reina Sofia ( Site 0705)
Córdoba, Andalusia, 14004, Spain
Hospital General Arnau de Vilanova de Valencia ( Site 0706)
Valencia, Valenciana, Comunitat, 46015, Spain
Instituto Oncologico Baselga.Hospital Quiron. ( Site 0707)
Barcelona, 08023, Spain
Hospital Universitari Vall d Hebron ( Site 0701)
Barcelona, 08035, Spain
Hospital Clinic I Provincial de Barcelona ( Site 0702)
Barcelona, 08036, Spain
Clinica Universitaria Navarra - Madrid ( Site 0700)
Madrid, 28027, Spain
Kaohsiung Chang Gung Memorial Hospital ( Site 2304)
Kaohsiung City, 83301, Taiwan
National Cheng Kung University Hospital ( Site 2303)
Tainan, 704, Taiwan
MacKay Memorial Hospital ( Site 2301)
Taipei, 10449, Taiwan
Koo Foundation Sun Yat-Sen Cancer Center ( Site 2300)
Taipei, 112, Taiwan
China Medical University Hospital ( Site 2302)
Taipei, 40447, Taiwan
Chernihiv Medical Center of Modern Oncology ( Site 1520)
Chernihiv, Chernihiv Oblast, 14029, Ukraine
Dnipropetrovsk City Multidiscipline Clinical Hosp. 4 of DRC ( Site 1502)
Dnipro, Dnipropetrovsk Oblast, 49102, Ukraine
CI Krivorizhskiy oncology dispensery ( Site 1504)
Kryviy Rih, Dnipropetrovsk Oblast, 50048, Ukraine
MI Precarpathian Clinical Oncology Center ( Site 1506)
Ivano-Frankivsk, Ivano-Frankivsk Oblast, 76018, Ukraine
Grigoriev Institute for medical Radiology NAMS of Ukraine ( Site 1508)
Kharkiv, Kharkivs’ka Oblast’, 61024, Ukraine
Communal non profit enterprise Regional Clinical Oncology Center ( Site 1512)
Kharkiv, Kharkivs’ka Oblast’, 61070, Ukraine
SI-Zaytsev institute of general and urgent surgery-NAMS ( Site 1518)
Kharkiv, Kharkivs’ka Oblast’, 61103, Ukraine
Medical Centre Consilium Medical ( Site 1514)
Kyiv, Kyivska Oblast, 04050, Ukraine
Medical center of the Limited Liability Company Yulis ( Site 1517)
Zaporizhzhia, Zaporizhzhia Oblast, 69035, Ukraine
Medical Centre LLC Oncolife ( Site 1510)
Zaporizhzhya, Zaporizhzhia Oblast, 69104, Ukraine
Zhytomyr Regional Oncology Center ( Site 1515)
Zhytomyr, Zhytomyr Oblast, 10002, Ukraine
Medical Center Verum ( Site 1501)
Kyiv, 03039, Ukraine
Raigmore Hospital ( Site 0915)
Inverness, Highland, IV2 3UJ, United Kingdom
Blackpool Victoria Hospital ( Site 0921)
Blackpool, Lancashire, FY3 8NR, United Kingdom
Barts Health NHS Trust ( Site 0912)
London, London, City of, EC1M 6BQ, United Kingdom
North West Cancer Centre ( Site 0922)
Londonderry, London, City of, BT47 6SB, United Kingdom
Musgrove Park Hospital ( Site 0918)
Taunton, Somerset, TA1 5DA, United Kingdom
The Christie NHS Foundation Trust ( Site 0914)
Manchester, M20 4BX, United Kingdom
Related Publications (1)
Rugo HS, Cescon DW, Robson ME, Im SA, Dalenc F, Yanez Ruiz E, Reyes-Cosmelli F, Walshe JM, Im YH, Kulyk S, Dudnichenko O, Llinas-Quintero N, Saji S, Miyoshi Y, Bardia A, Harbeck N, Haiderali A, Fan L, Mejia JA, Karantza V, Llombart-Cussac A. KEYLYNK-009: Pembrolizumab plus Olaparib in Locally Recurrent Inoperable or Metastatic Triple-Negative Breast Cancer after Clinical Benefit from First-Line Pembrolizumab plus Chemotherapy. Clin Cancer Res. 2026 Mar 2;32(5):883-893. doi: 10.1158/1078-0432.CCR-25-1818.
PMID: 41405563RESULT
Related Links
MeSH Terms
Conditions
Interventions
Condition Hierarchy (Ancestors)
Intervention Hierarchy (Ancestors)
Results Point of Contact
- Title
- Senior Vice President, Global Clinical Development
- Organization
- Merck Sharp & Dohme LLC
Study Officials
- STUDY DIRECTOR
Medical Director
Merck Sharp & Dohme LLC
Publication Agreements
- PI is Sponsor Employee
- No
- Restriction Type
- OTHER
- Restrictive Agreement
- Yes
Study Design
- Study Type
- interventional
- Phase
- phase 2
- Allocation
- RANDOMIZED
- Masking
- NONE
- Purpose
- TREATMENT
- Intervention Model
- PARALLEL
- Sponsor Type
- INDUSTRY
- Responsible Party
- SPONSOR
Study Record Dates
First Submitted
December 5, 2019
First Posted
December 9, 2019
Study Start
December 19, 2019
Primary Completion
December 15, 2022
Study Completion
November 26, 2025
Last Updated
March 3, 2026
Results First Posted
February 14, 2024
Record last verified: 2026-02
Data Sharing
- IPD Sharing
- Will share
https://trialstransparency.msdclinicaltrials.com/pdf/ProcedureAccessClinicalTrialData.pdf