KEYTRUDA Reduced the Risk of Recurrence or Death by 35% Compared to Placebo and Is the First Anti-PD-1 Therapy to Improve RFS in the Adjuvant Setting for Resected High-Risk Stage II Melanoma 

Results From Phase 3 KEYNOTE-716 Trial Selected for Presentation During Presidential Symposium and Official Press Program at ESMO Congress 2021

KENILWORTH, NJ, USA I September 18, 2021 I Merck (NYSE: MRK), known as MSD outside the United States and Canada, today announced the first results from the Phase 3 KEYNOTE-716 trial, in which adjuvant treatment with KEYTRUDA, Merck’s anti-PD-1 therapy, showed a statistically significant and clinically meaningful improvement in recurrence-free survival (RFS), the trial’s primary endpoint, compared to placebo in patients with resected high-risk stage II melanoma; KEYTRUDA is the first anti-PD-1 therapy to demonstrate this.

At the first interim analysis, KEYTRUDA reduced the risk of disease recurrence or death by 35% (HR=0.65 [95% CI, 0.46–0.92]; p=0.00658) compared to placebo. Median RFS had not been reached for either group at the time of this analysis. After 14.4 months follow-up, 11.1% (n=54/487) of patients on KEYTRUDA had recurrence or died compared with 16.8% (n=82/489) of patients on placebo, with fewer distant recurrences with KEYTRUDA (4.7%, n=23/487) versus placebo (7.8%, n=38/489).

“We conducted KEYNOTE-716 to explore whether adjuvant KEYTRUDA, an approved adjuvant treatment option across all resected stage III melanoma, could prolong recurrence-free survival for patients with resected high-risk stage II disease,” said Dr. Roy Baynes, senior vice president and head of global clinical development, chief medical officer, Merck Research Laboratories. “These findings of a significant 35% reduction in the risk of disease recurrence or death compared to placebo support earlier intervention with KEYTRUDA. We are pleased that these findings have been accepted for priority review by the FDA, and we are grateful to the investigators and patients for their involvement in this important study.”

The safety profile of KEYTRUDA was consistent with previously reported studies in patients with solid tumors. Treatment-related adverse events (TRAEs) occurred in 79.9.% of patients who received KEYTRUDA versus 60.9% of patients who received placebo, while Grade 3 or 4 TRAEs were observed in 16.1% versus 4.3% of patients, respectively.

“Patients diagnosed with stage IIB and IIC melanoma have a high risk of recurrence after complete resection and similar five-year survival outcomes as those with stage IIIA and IIIB disease, but because there are no systemic treatment options available, the standard of care is observation,” said Dr. Jason Luke, director, Cancer Immunotherapeutics Center at UPMC Hillman Cancer Center. “The encouraging results from KEYNOTE-716 show that adjuvant treatment with pembrolizumab was associated with a significant reduction in disease recurrence or death versus placebo for patients with resected high-risk stage II melanoma and, if approved, may offer these patients a new treatment option.”

These late-breaking data from KEYNOTE-716 are being presented today at the European Society for Medical Oncology (ESMO) Congress 2021 (Abstract #LBA3) and are being featured as part of the official ESMO press program.

Finding cancer at an earlier stage may give patients a greater chance of long-term survival. Many cancers are considered most treatable and potentially curable in their earliest stage of disease. Building on the strong understanding of the role of KEYTRUDA in later stage cancers, Merck is studying KEYTRUDA in earlier disease states, with approximately 20 registrational studies ongoing across multiple types of cancer.

A compendium of presentations and posters of Merck-led studies is available here. Follow Merck on Twitter via @Merck, and keep up to date with ESMO news and updates by using the hashtag #ESMO21.

Study Design

KEYNOTE-716 is a randomized, two-part, Phase 3 trial (ClinicalTrials.gov, NCT03553836) evaluating KEYTRUDA for the adjuvant treatment of patients with resected high-risk stage II melanoma. The primary endpoint is RFS, and the secondary endpoints include distant metastasis-free survival, overall survival and safety. Exploratory endpoints included quality of life.

In Part 1 of the study, which was double-blind, patients age 12 and older were randomized (1:1) to receive KEYTRUDA, 200 mg by intravenous [IV] infusion for adult patients or 2 mg/kg [200 mg maximum] by IV for pediatric patients, (n=487) or placebo (n=489) every three weeks for up to 17 cycles (approximately one year). In Part 2 of the study, which was open-label, eligible adult and pediatric patients received up to 35 additional cycles (approximately two years) of KEYTRUDA. Eligibility for Part 2 included patients who recurred after receiving placebo or completed 17 cycles of KEYTRUDA; patients on KEYTRUDA must not have experienced disease recurrence within six months of completing treatment.

Among enrolled patients in each treatment group, approximately 64% had stage IIB disease (n=309/487 for KEYTRUDA; n=316/489 for placebo), and approximately 35% had stage IIC disease (n=171/487 for KEYTRUDA; n=169/489 for placebo).

About Melanoma

Melanoma, the most serious form of skin cancer, is characterized by the uncontrolled growth of pigment-producing cells. The rates of melanoma have been rising over the past few decades, with nearly 325,000 new cases diagnosed worldwide in 2020. The recurrence rates for resected melanoma are estimated to be 32-46% for patients with stage IIB and stage IIC and 44-74% for patients with stage III. The five-year survival rates (AJCC eighth edition) are estimated to be 87% in stage IIB, 82% in stage IIC, 93% in stage IIIA and 83% in stage IIIB.

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.

Selected KEYTRUDA® (pembrolizumab) Indications in the U.S.

Melanoma

KEYTRUDA is indicated for the treatment of patients with unresectable or metastatic melanoma.

KEYTRUDA is indicated for the adjuvant treatment of patients with melanoma with involvement of lymph node(s) following complete resection.

Non-Small Cell Lung Cancer

KEYTRUDA, in combination with pemetrexed and platinum chemotherapy, is indicated for the first-line treatment of patients with metastatic nonsquamous non-small cell lung cancer (NSCLC), with no EGFR or ALK genomic tumor aberrations.

KEYTRUDA, in combination with carboplatin and either paclitaxel or paclitaxel protein-bound, is indicated for the first-line treatment of patients with metastatic squamous NSCLC.

KEYTRUDA, as a single agent, is indicated for the first-line treatment of patients with NSCLC expressing PD-L1 [tumor proportion score (TPS) ≥1%] as determined by an FDA-approved test, with no EGFR or ALK genomic tumor aberrations, and is:

  • stage III where patients are not candidates for surgical resection or definitive chemoradiation, or
  • metastatic.

KEYTRUDA, as a single agent, is indicated for the treatment of patients with metastatic NSCLC whose tumors express PD-L1 (TPS ≥1%) as determined by an FDA-approved test, with disease progression on or after platinum-containing chemotherapy. Patients with EGFR or ALK genomic tumor aberrations should have disease progression on FDA-approved therapy for these aberrations prior to receiving KEYTRUDA.

Head and Neck Squamous Cell Cancer

KEYTRUDA, in combination with platinum and fluorouracil (FU), is indicated for the first-line treatment of patients with metastatic or with unresectable, recurrent head and neck squamous cell carcinoma (HNSCC).

KEYTRUDA, as a single agent, is indicated for the first-line treatment of patients with metastatic or with unresectable, recurrent HNSCC whose tumors express PD-L1 [combined positive score (CPS ≥1)] as determined by an FDA-approved test.

KEYTRUDA, as a single agent, is indicated for the treatment of patients with recurrent or metastatic HNSCC with disease progression on or after platinum-containing chemotherapy.

Classical Hodgkin Lymphoma

KEYTRUDA is indicated for the treatment of adult patients with relapsed or refractory classical Hodgkin lymphoma (cHL).

KEYTRUDA is indicated for the treatment of pediatric patients with refractory cHL, or cHL that has relapsed after 2 or more lines of therapy.

Primary Mediastinal Large B-Cell Lymphoma

KEYTRUDA is indicated for the treatment of adult and pediatric patients with refractory primary mediastinal large B-cell lymphoma (PMBCL), or who have relapsed after 2 or more prior lines of therapy. KEYTRUDA is not recommended for treatment of patients with PMBCL who require urgent cytoreductive therapy.

Urothelial Carcinoma

KEYTRUDA is indicated for the treatment of patients with locally advanced or metastatic urothelial carcinoma (mUC):

  • who are not eligible for any platinum-containing chemotherapy, or
  • who have disease progression during or following platinum-containing chemotherapy or within 12 months of neoadjuvant or adjuvant treatment with platinum-containing chemotherapy.

KEYTRUDA is indicated for the treatment of patients with Bacillus Calmette-Guerin-unresponsive, high-risk, non-muscle invasive bladder cancer (NMIBC) with carcinoma in situ with or without papillary tumors who are ineligible for or have elected not to undergo cystectomy.

Microsatellite Instability-High or Mismatch Repair Deficient Cancer

KEYTRUDA is indicated for the treatment of adult and pediatric patients with unresectable or metastatic microsatellite instability-high (MSI-H) or mismatch repair deficient (dMMR) solid tumors that have progressed following prior treatment and who have no satisfactory alternative treatment options.

This indication is approved under accelerated approval based on tumor response rate and durability of response. Continued approval for this indication may be contingent upon verification and description of clinical benefit in the confirmatory trials. The safety and effectiveness of KEYTRUDA in pediatric patients with MSI-H central nervous system cancers have not been established.

Microsatellite Instability-High or Mismatch Repair Deficient Colorectal Cancer

KEYTRUDA is indicated for the treatment of patients with unresectable or metastatic MSI-H or dMMR colorectal cancer (CRC).

Gastric Cancer

KEYTRUDA, in combination with trastuzumab, fluoropyrimidine- and platinum-containing chemotherapy, is indicated for the first-line treatment of patients with locally advanced unresectable or metastatic HER2-positive gastric or gastroesophageal junction (GEJ) adenocarcinoma.

This indication is approved under accelerated approval based on tumor response rate and durability of response. Continued approval for this indication may be contingent upon verification and description of clinical benefit in the confirmatory trials.

Esophageal Cancer

KEYTRUDA is indicated for the treatment of patients with locally advanced or metastatic esophageal or GEJ (tumors with epicenter 1 to 5 centimeters above the GEJ) carcinoma that is not amenable to surgical resection or definitive chemoradiation either:

  • in combination with platinum- and fluoropyrimidine-based chemotherapy, or
  • as a single agent after one or more prior lines of systemic therapy for patients with tumors of squamous cell histology that express PD-L1 (CPS ≥10) as determined by an FDA-approved test.

Cervical Cancer

KEYTRUDA is indicated for the treatment of patients with recurrent or metastatic cervical cancer with disease progression on or after chemotherapy whose tumors express PD-L1 (CPS ≥1) as determined by an FDA-approved test. This indication is approved under accelerated approval based on tumor response rate and durability of response. Continued approval for this indication may be contingent upon verification and description of clinical benefit in the confirmatory trials.

Hepatocellular Carcinoma

KEYTRUDA is indicated for the treatment of patients with hepatocellular carcinoma (HCC) who have been previously treated with sorafenib. This indication is approved under accelerated approval based on tumor response rate and durability of response. Continued approval for this indication may be contingent upon verification and description of clinical benefit in the confirmatory trials.

Merkel Cell Carcinoma

KEYTRUDA is indicated for the treatment of adult and pediatric patients with recurrent locally advanced or metastatic Merkel cell carcinoma (MCC). This indication is approved under accelerated approval based on tumor response rate and durability of response. Continued approval for this indication may be contingent upon verification and description of clinical benefit in the confirmatory trials.

Renal Cell Carcinoma

KEYTRUDA, in combination with axitinib, is indicated for the first-line treatment of adult patients with advanced renal cell carcinoma.

Tumor Mutational Burden-High Cancer

KEYTRUDA is indicated for the treatment of adult and pediatric patients with unresectable or metastatic tumor mutational burden-high (TMB-H) [≥10 mutations/megabase] solid tumors, as determined by an FDA-approved test, that have progressed following prior treatment and who have no satisfactory alternative treatment options. This indication is approved under accelerated approval based on tumor response rate and durability of response. Continued approval for this indication may be contingent upon verification and description of clinical benefit in the confirmatory trials. The safety and effectiveness of KEYTRUDA in pediatric patients with TMB-H central nervous system cancers have not been established.

Cutaneous Squamous Cell Carcinoma

KEYTRUDA is indicated for the treatment of patients with recurrent or metastatic cutaneous squamous cell carcinoma (cSCC) or locally advanced cSCC that is not curable by surgery or radiation.

Triple-Negative Breast Cancer

KEYTRUDA is indicated for the treatment of patients with high-risk early-stage triple-negative breast cancer (TNBC) in combination with chemotherapy as neoadjuvant treatment, and then continued as a single agent as adjuvant treatment after surgery.

KEYTRUDA, in combination with chemotherapy, is indicated for the treatment of patients with locally recurrent unresectable or metastatic TNBC whose tumors express PD-L1 (CPS ≥10) as determined by an FDA-approved test.

Merck’s Focus on Cancer

Our goal is to translate breakthrough science into innovative oncology medicines to help people with cancer worldwide. At Merck, the potential to bring new hope to people with cancer drives our purpose and supporting accessibility to our cancer medicines is our commitment. As part of our focus on cancer, Merck is committed to exploring the potential of immuno-oncology with one of the largest development programs in the industry across more than 30 tumor types. We also continue to strengthen our portfolio through strategic acquisitions and are prioritizing the development of several promising oncology candidates with the potential to improve the treatment of advanced cancers. For more information about our oncology clinical trials, visit www.merck.com/clinicaltrials.

About Merck

For over 130 years, Merck, known as MSD outside of the United States and Canada, has been inventing for life, bringing forward medicines and vaccines for many of the world’s most challenging diseases in pursuit of our mission to save and improve lives. We demonstrate our commitment to patients and population health by increasing access to health care through far-reaching policies, programs and partnerships. Today, Merck continues to be at the forefront of research to prevent and treat diseases that threaten people and animals – including cancer, infectious diseases such as HIV and Ebola, and emerging animal diseases – as we aspire to be the premier research-intensive biopharmaceutical company in the world. For more information, visit www.merck.com and connect with us on Twitter, Facebook, Instagram, YouTube and LinkedIn.

SOURCE: Merck