Trastuzumab

Subcutaneous pembrolizumab administered every six weeks with a median injection time of two minutes, in combination with chemotherapy, shows consistent results across reported efficacy and safety endpoints compared to IV KEYTRUDA in combination with chemotherapy A time and motion descriptive analysis shows nearly 50% reductions in patient chair and treatment room time, and in total active healthcare professional time related to treatment tasks, for subcutaneous pembrolizumab compared to IV KEYTRUDA Applications for subcutaneous pembrolizumab are under review in the U.S. and Europe RAHWAY, NJ, USA I March 27, 2025 I Merck (NYSE: MRK), known as MSD outside of the United States and Canada, today announced the first data presentation from the pivotal 3475A-D77 Phase 3 trial, evaluating the subcutaneous administration of pembrolizumab, together with berahyaluronidase alfa (MK-3475A; from now on referred to as “subcutaneous pembrolizumab”). Berahyaluronidase alfa is a variant of human hyaluronidase developed and manufactured by Alteogen Inc. These results are being presented today at the European Lung Cancer Congress (ELCC) 2025 (Abstract #8MO) and published simultaneously in Annals of Oncology. The study met its primary endpoints, demonstrating noninferior pharmacokinetics (PK) for subcutaneous pembrolizumab administered with chemotherapy with a median injection time of two minutes, versus intravenous (IV) KEYTRUDA ® (pembrolizumab) administered with chemotherapy for the first-line treatment of adult patients with metastatic non-small cell lung cancer (NSCLC). The secondary endpoints of objective response rate (ORR), progression-free survival (PFS) and duration of response (DOR) and safety were consistent for subcutaneous pembrolizumab with chemotherapy compared to IV KEYTRUDA with chemotherapy. Median overall survival (OS) was not reached in either arm. Based on these data, the U.S. Food and Drug Administration (FDA) has accepted for review a Biologics License Application (BLA) seeking approval of subcutaneous pembrolizumab across all previously approved solid tumor indications for KEYTRUDA. The FDA has set a Prescription Drug User Fee Act (PDUFA), or target action, date of Sept. 23, 2025. Additionally, the European Medicines Agency (EMA) has validated an extension application to introduce a new pharmaceutical form and new route of administration for KEYTRUDA. In addition, results of a prospective, observational time and motion descriptive analysis conducted alongside study 3475A-D77 show that, compared to IV KEYTRUDA, subcutaneous pembrolizumab reduced time for patients spent in-chair and in the treatment room by 49.7% and 47.4%, respectively, and reduced the total active time spent by healthcare professionals (HCPs) on treatment preparation, administration process and patient monitoring by 45.7%. These results are being presented as a poster at ELCC (Poster #33P). Pharmacokinetic, efficacy, safety and time and motion results are described further below. “These study findings demonstrate subcutaneous pembrolizumab reduces time demands for both the patient and the healthcare provider, all while providing a consistent efficacy and safety profile with IV pembrolizumab,” said Dr. Enriqueta Felip, head of Thoracic Tumors Group, Vall d’Hebron Institute of Oncology. “As a physician, I am thrilled to see these data for subcutaneous pembrolizumab, which, if approved, have the potential to give patients valuable time back in their treatment day with results that are consistent with IV pembrolizumab.” In the 3475A-D77 trial, subcutaneous pembrolizumab, administered every six weeks with a median injection time of two minutes (4.8 mL) along with chemotherapy, demonstrated noninferiority of area under the curve (AUC) exposure of pembrolizumab during the first dosing cycle (geometric mean ratio of 1.14 [96% CI, 1.06-1.22]; p<0.0001) and model-based trough concentration (Ctrough) of pembrolizumab measured at steady state (geometric mean ratio of 1.67 [94% CI, 1.52-1.84]; p<0.0001), compared to IV KEYTRUDA administered every six weeks with chemotherapy. “KEYTRUDA has helped transform the treatment of certain cancers, and we continue to pursue innovations that build on this breakthrough medicine to give patients and those who treat them better experiences,” said Dr. Marjorie Green, senior vice president and head of oncology, global clinical development, Merck Research Laboratories. “If approved, we are excited about the potential of subcutaneous pembrolizumab to become a new meaningful treatment option that may increase access and save time needed for administration compared to IV KEYTRUDA. We look forward to working with global regulatory authorities to bring the first subcutaneous checkpoint inhibitor that can be administered in approximately two minutes to patients and providers.” In the prospective, observational time and motion study, patient time in chair during treatment with pembrolizumab was reduced by 49.7% (weighted means [WM]: 59.0 versus 117.2 minutes) for subcutaneous pembrolizumab with chemotherapy compared to IV KEYTRUDA with chemotherapy. Patients receiving subcutaneous pembrolizumab versus IV KEYTRUDA spent 47.4% less time in the treatment room (WM: 66.7 versus 126.9 minutes). Time associated with chemotherapy administration was removed from chair and treatment room duration. Results also show that subcutaneous pembrolizumab with chemotherapy reduced total active HCP time by 45.7% (WM: 14.0 versus 25.8 minutes;), including 44.6% less time on subcutaneous pembrolizumab preparation (WM: 5.1 versus 9.2 minutes) and 46.7% less time on subcutaneous pembrolizumab administration process and patient monitoring (WM: 8.9 versus 16.7 minutes) compared to IV KEYTRUDA with chemotherapy. The differences as measured by a linear mixed model were statistically significant (p<0.0001) for active HCP and patient time endpoints. In addition to the 3475A-D77 trial, Merck’s subcutaneous pembrolizumab clinical development program includes the 3475A-F84 Phase 3 trial evaluating subcutaneous pembrolizumab administered alone compared to IV KEYTRUDA alone for the first-line treatment of patients with metastatic NSCLC whose tumors have high PD-L1 expression (tumor proportion score [TPS] ≥50%), as well as the 3475A-F65 Phase 2 trial evaluating subcutaneous pembrolizumab administered alone in relapsed or refractory classical Hodgkin lymphoma and relapsed or refractory primary mediastinal large B-cell lymphoma. Merck is also conducting a patient preference Phase 2 study, 3475A-F11, evaluating participant-reported preference for subcutaneous pembrolizumab compared to IV KEYTRUDA. Study design and additional data from 3475A-D77 Study 3475A-D77 is a randomized, open-label Phase 3 trial (ClinicalTrials.gov, NCT05722015 ) evaluating the subcutaneous administration of pembrolizumab together with berahyaluronidase alfa administered every six weeks with chemotherapy compared to IV KEYTRUDA administered every six weeks in combination with chemotherapy for the first-line treatment of adult patients with metastatic NSCLC, regardless of PD-L1 TPS expression. The study is designed to assess the dual primary PK endpoints of the AUC of pembrolizumab exposure during the first dosing cycle and the Ctrough of pembrolizumab measured at steady state. Secondary endpoints include additional PK parameters as well as efficacy (ORR, DOR, PFS and OS) and safety. The trial enrolled 377 patients who were randomized (2:1) to receive either subcutaneous pembrolizumab administered with chemotherapy or IV KEYTRUDA in combination with chemotherapy. Secondary efficacy endpoints of the study, which were descriptive, showed: Among patients who received subcutaneous pembrolizumab with chemotherapy (n=251), Grade ≥3 adverse events (AEs) occurred in 47% of patients versus 47.6% of patients who received IV KEYTRUDA with chemotherapy (n=126). The incidence of local injection site reactions for subcutaneous pembrolizumab with chemotherapy was 2.4%, all of which were low grade. Treatment-related adverse events (TRAEs) led to discontinuation of subcutaneous pembrolizumab in 8.4% of patients in the subcutaneous pembrolizumab with chemotherapy arm and in 8.7% of patients in the IV KEYTRUDA with chemotherapy arm. Additionally, TRAEs led to discontinuation of chemotherapy in 15.1% of patients in the subcutaneous pembrolizumab with chemotherapy arm and 11.9% of patients in the IV KEYTRUDA with chemotherapy arm. Treatment-related deaths occurred in 3.6% of patients who received subcutaneous pembrolizumab with chemotherapy and 2.4% of patients who received IV KEYTRUDA with chemotherapy. Study design from time and motion study The global observational time and motion study enrolled 17 sites across eight countries in Europe (4), South America (3) and Asia (1) from the 3475A-D77 trial. Primary endpoints were patient time in chair during treatment, patient time in treatment room and total active HCP time for tasks related to subcutaneous pembrolizumab preparation, administration process and patient monitoring. Time was measured by trained observers using a stopwatch, and time associated with chemotherapy administration was removed from patient in-chair and treatment room duration. Descriptive statistics were calculated including WM to account for unequal sample sizes across countries in each group. Statistical differences between subcutaneous and IV arms were explored via a linear mixed model. About KEYTRUDA ® (pembrolizumab) injection for intravenous use, 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. 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: 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. KEYTRUDA is indicated for the treatment of patients with resectable (tumors ≥4 cm or node positive) NSCLC in combination with platinum-containing chemotherapy as neoadjuvant treatment, and then continued as a single agent as adjuvant treatment after surgery. KEYTRUDA, as a single agent, is indicated as adjuvant treatment following resection and platinum-based chemotherapy for adult patients with Stage IB (T2a ≥4 cm), II, or IIIA NSCLC. Melanoma KEYTRUDA is indicated for the treatment of patients with unresectable or metastatic melanoma. KEYTRUDA is indicated for the adjuvant treatment of adult and pediatric (12 years and older) patients with Stage IIB, IIC, or III melanoma following complete resection. Malignant Pleural Mesothelioma KEYTRUDA, in combination with pemetrexed and platinum chemotherapy, is indicated for the first-line treatment of adult patients with unresectable advanced or metastatic malignant pleural mesothelioma (MPM). 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 Cancer KEYTRUDA, in combination with enfortumab vedotin, is indicated for the treatment of adult patients with locally advanced or metastatic urothelial cancer. KEYTRUDA, as a single agent, is indicated for the treatment of patients with locally advanced or metastatic urothelial carcinoma: KEYTRUDA, as a single agent, is indicated for the treatment of patients with Bacillus Calmette-Guerin (BCG)-unresponsive, high-risk, non-muscle invasive bladder cancer (NMIBC) with carcinoma in situ (CIS) 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, as determined by an FDA-approved test, that have progressed following prior treatment and who have no satisfactory alternative treatment options. 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) as determined by an FDA-approved test. Gastric Cancer KEYTRUDA, in combination with trastuzumab, fluoropyrimidine- and platinum-containing chemotherapy, is indicated for the first-line treatment of adults with locally advanced unresectable or metastatic HER2-positive gastric or gastroesophageal junction (GEJ) adenocarcinoma whose tumors express PD-L1 (CPS ≥1) as determined by an FDA-approved test. KEYTRUDA, in combination with fluoropyrimidine- and platinum-containing chemotherapy, is indicated for the first-line treatment of adults with locally advanced unresectable or metastatic HER2-negative gastric or gastroesophageal junction (GEJ) adenocarcinoma. Esophageal Cancer KEYTRUDA is indicated for the treatment of patients with locally advanced or metastatic esophageal or gastroesophageal junction (GEJ) (tumors with epicenter 1 to 5 centimeters above the GEJ) carcinoma that is not amenable to surgical resection or definitive chemoradiation either: Cervical Cancer KEYTRUDA, in combination with chemoradiotherapy (CRT), is indicated for the treatment of patients with FIGO 2014 Stage III-IVA cervical cancer. KEYTRUDA, in combination with chemotherapy, with or without bevacizumab, is indicated for the treatment of patients with persistent, recurrent, or metastatic cervical cancer whose tumors express PD-L1 (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 cervical cancer with disease progression on or after chemotherapy whose tumors express PD-L1 (CPS ≥1) as determined by an FDA-approved test. Hepatocellular Carcinoma KEYTRUDA is indicated for the treatment of patients with hepatocellular carcinoma (HCC) secondary to hepatitis B who have received prior systemic therapy other than a PD-1/PD-L1-containing regimen. Biliary Tract Cancer KEYTRUDA, in combination with gemcitabine and cisplatin, is indicated for the treatment of patients with locally advanced unresectable or metastatic biliary tract cancer (BTC). Merkel Cell Carcinoma KEYTRUDA is indicated for the treatment of adult and pediatric patients with recurrent locally advanced or metastatic Merkel cell carcinoma (MCC). Renal Cell Carcinoma KEYTRUDA, in combination with axitinib, is indicated for the first-line treatment of adult patients with advanced renal cell carcinoma (RCC). KEYTRUDA is indicated for the adjuvant treatment of patients with RCC at intermediate-high or high risk of recurrence following nephrectomy or following nephrectomy and resection of metastatic lesions. Endometrial Carcinoma KEYTRUDA, in combination with carboplatin and paclitaxel, followed by KEYTRUDA as a single agent, is indicated for the treatment of adult patients with primary advanced or recurrent endometrial carcinoma. KEYTRUDA, as a single agent, is indicated for the treatment of adult patients with advanced endometrial carcinoma that is MSI-H or dMMR, as determined by an FDA-approved test, who have disease progression following prior systemic therapy in any setting and are not candidates for curative surgery or radiation. 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 (mut/Mb)] 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 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 https://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. 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