Approval of KEYTRUDA plus enfortumab vedotin brings a potential new first-line standard of care to these patients in the European Union
September 3, 2024 6:45 am ET--RAHWAY, N.J.--(BUSINESS WIRE)-- Merck (NYSE: MRK), known as MSD outside of the United States and Canada, today announced that the European Commission (EC) has approved KEYTRUDA ® (pembrolizumab), Merck’s anti-PD-1 therapy, in combination with Padcev (enfortumab vedotin-ejfv), an antibody-drug conjugate, for the first-line treatment of unresectable or metastatic urothelial carcinoma in adults. The decision follows the adoption of the European Society for Medical Oncology and European Association of Urology clinical guidelines recommending the combination as the preferred first-line treatment for these patients, regardless of platinum eligibility.
This approval by the EC also follows the positive recommendation from the Committee for Medicinal Products for Human Use received in July 2024 , which was based on results from the first interim analysis of the Phase 3 KEYNOTE-A39 trial (also known as EV-302), which was conducted in a research collaboration with Pfizer (previously Seagen) and Astellas. In KEYNOTE-A39, KEYTRUDA plus enfortumab vedotin demonstrated statistically significant and clinically meaningful improvements in overall survival (OS) and progression-free survival (PFS) versus platinum-based chemotherapy (gemcitabine plus cisplatin or carboplatin).
At a median follow-up of 17.3 months (range, 0.3 to 37.2 months), the KEYTRUDA plus enfortumab vedotin combination reduced the risk of death by 53% (HR=0.47 [95% CI, 0.38-0.58]; p<0.00001) versus platinum-based chemotherapy (with 133/442 [30%] vs. 226/444 [51%] events observed, respectively), with the combination also reducing the risk of disease progression or death by 55% (HR=0.45 [95% CI, 0.38-0.54]; p<0.00001) versus platinum-based chemotherapy (with 223/442 [50%] vs. 307/444 [69%] events observed, respectively).
“For the first time in decades, adult patients with unresectable or metastatic urothelial carcinoma have the option of a potential new first-line standard of care that may help extend their lives,” said Dr. Marjorie Green, senior vice president and head of oncology, global clinical development, Merck Research Laboratories. “We are pleased with the European Commission’s decision, and we look forward to being able to provide KEYTRUDA as part of this novel treatment regimen for this devastating disease to patients in the European Union.”
This approval allows marketing of KEYTRUDA in combination with enfortumab vedotin for this indication in all 27 European Union (EU) member states, as well as Iceland, Liechtenstein, Norway and Northern Ireland. KEYTRUDA is now approved for three indications in bladder cancer, and for 28 indications overall in the EU. KEYTRUDA was previously approved in the EU as monotherapy for the treatment of locally advanced or metastatic urothelial carcinoma in adults who have received prior platinum-containing chemotherapy, as well as adults who are not eligible for cisplatin-containing chemotherapy and whose tumors express PD-L1 with a combined positive score (CPS) ≥10, based on results from KEYNOTE-045 and KEYNOTE-052, respectively. In December 2023 , KEYTRUDA in combination with enfortumab vedotin was approved in the U.S. for the treatment of adult patients with locally advanced or metastatic urothelial cancer.
Merck, in collaboration with Pfizer and Astellas, is evaluating this combination as part of an extensive clinical development program in multiple stages of urothelial cancer, including two Phase 3 clinical trials in muscle-invasive bladder cancer in KEYNOTE-B15 ( NCT04700124 , also known as EV-304) and KEYNOTE-905 ( NCT03924895 , also known as EV-303).
About KEYNOTE-A39
The KEYNOTE-A39 trial is an open-label, multicenter, randomized, active-controlled Phase 3 trial (ClinicalTrials.gov, NCT04223856 ) evaluating KEYTRUDA plus enfortumab vedotin compared to platinum-based chemotherapy (gemcitabine plus cisplatin or carboplatin) for the treatment of patients with unresectable or metastatic urothelial carcinoma. The primary efficacy outcome measures were PFS as assessed by blinded independent central review (BICR) according to Response Evaluation Criteria in Solid Tumors (RECIST) v1.1 and OS. Secondary outcome measures included objective response rate (ORR) and duration of response (DOR) as assessed by BICR according to RECIST v1.1. The study enrolled 886 patients who were randomized (1:1) to one of the following treatment arms; all study medications were administered via intravenous infusion:
KEYTRUDA 200 mg over 30 minutes on Day 1 and enfortumab vedotin 1.25 mg/kg on Days 1 and 8 of each 21-day cycle.
Gemcitabine 1000 mg/m 2 on Days 1 and 8 and investigator’s choice of cisplatin 70 mg/m 2 or carboplatin (AUC 4.5 or 5 mg/mL/min according to local guidelines) on Day 1 of each 21-day cycle.
Treatment with KEYTRUDA and enfortumab vedotin continued until RECIST v1.1-defined progression of disease, unacceptable toxicity or, for KEYTRUDA, a maximum of 35 cycles (up to approximately two years). Assessment of tumor status was performed every nine weeks for 18 months and then every 12 weeks thereafter.
About KEYTRUDA ® (pembrolizumab) injection, 100 mg
KEYTRUDA is an anti-programmed death receptor-1 (PD-1) therapy that works by increasing the ability of the body’s immune system to help detect and fight tumor cells. KEYTRUDA is a humanized monoclonal antibody that blocks the interaction between PD-1 and its ligands, PD- L1 and PD-L2, thereby activating T lymphocytes which may affect both tumor cells and healthy cells.
Merck has the industry’s largest immuno-oncology clinical research program. There are currently more than 1,600 trials studying KEYTRUDA across a wide variety of cancers and treatment settings. The KEYTRUDA clinical program seeks to understand the role of KEYTRUDA across cancers and the factors that may predict a patient's likelihood of benefitting from treatment with KEYTRUDA, including exploring several different biomarkers.
About bladder and urothelial carcinoma
Urothelial carcinoma, a type of bladder cancer, begins in the urothelial cells, which line the urethra, bladder, ureters, renal pelvis and some other organs. Globally, it is estimated that approximately 614,300 new cases of bladder cancer are reported annually. In Europe, it is estimated there were approximately 166,000 new cases of bladder cancer diagnosed in 2022, and in the U.S., it is estimated that approximately 83,200 people will be diagnosed with bladder cancer in 2024. Of those patients diagnosed in the U.S., approximately 12% of cases are locally advanced or metastatic urothelial carcinoma at diagnosis, and many patients who are diagnosed at an advanced stage face a poor prognosis.
About the Astellas, Pfizer and Merck collaboration
Astellas and Seagen entered a clinical collaboration agreement with Merck to evaluate the combination of Astellas’ and Seagen’s Padcev ® (enfortumab vedotin-ejfv) and Merck’s KEYTRUDA ® (pembrolizumab) in patients with previously untreated metastatic urothelial cancer. Padcev ® and the Padcev device are trademarks jointly owned by Agensys, Inc., and Seagen Inc. Pfizer Inc. completed its acquisition of Seagen on December 14, 2023.
Merck’s focus on cancer
Every day, we follow the science as we work to discover innovations that can help patients, no matter what stage of cancer they have. As a leading oncology company, we are pursuing research where scientific opportunity and medical need converge, underpinned by our diverse pipeline of more than 25 novel mechanisms. With one of the largest clinical development programs across more than 30 tumor types, we strive to advance breakthrough science that will shape the future of oncology. By addressing barriers to clinical trial participation, screening and treatment, we work with urgency to reduce disparities and help ensure patients have access to high-quality cancer care. Our unwavering commitment is what will bring us closer to our goal of bringing life to more patients with cancer. For more information, visit http://www.merck.com/research/oncology .
About Merck
At Merck, known as MSD outside of the United States and Canada, we are unified around our purpose: We use the power of leading-edge science to save and improve lives around the world. For more than 130 years, we have brought hope to humanity through the development of important medicines and vaccines. We aspire to be the premier research-intensive biopharmaceutical company in the world – and today, we are at the forefront of research to deliver innovative health solutions that advance the prevention and treatment of diseases in people and animals. We foster a diverse and inclusive global workforce and operate responsibly every day to enable a safe, sustainable and healthy future for all people and communities. For more information, visit www.merck.com and connect with us X (formerly Twitter) , Facebook , Instagram , YouTube and LinkedIn .