Pivotal Phase 3 Study of Merck’s Investigational Beta-Lactamase Inhibitor Relebactam in Combination with Imipenem/Cilastatin Demonstrated Favorable Overall Response Against Certain Imipenem–Non-Susceptible Bacterial Infections
KENILWORTH, N.J., April 22, 2018 – Merck (NYSE: MRK), known as MSD outside the United States and Canada, today announced that a pivotal Phase 3 study of relebactam, the company’s investigational beta-lactamase inhibitor, in combination with imipenem/cilastatin, demonstrated a favorable overall response in the treatment of certain imipenem–non-susceptible bacterial infections, the primary endpoint, with lower treatment-emergent nephrotoxicity (kidney toxicity), a secondary endpoint, compared to a Colistin (colistimethate sodium) plus imipenem regimen.
Based on these results, the company plans to submit a New Drug Application to the U.S. Food and Drug Administration seeking regulatory approval of a fixed-dose combination of imipenem/cilastatin and relebactam.
“Infections caused by Gram-negative bacteria continue to be a major problem for hospitalized patients. The prevalence of carbapenem-resistant pathogens is increasing globally, highlighting the need for effective new antibacterial agents with Gram-negative coverage,” said Dr. Amanda Paschke, senior principal scientist, infectious disease clinical research, Merck Research Laboratories. “We look forward to advancing relebactam in combination with imipenem/cilastatin, and continuing to build on Merck's longstanding commitment in the fight against infectious disease.”
Results of the RESTORE-IMI 1 study were presented at the 28th European Congress of Clinical Microbiology and Infectious Diseases (ECCMID) 2018 meeting in Madrid, Spain, April 21-24. The study was a multicenter, randomized, double-blind, comparator-controlled trial comparing the efficacy and safety of imipenem/cilastatin/relebactam (IMI/REL) versus Colistin plus imipenem/cilastatin (COL+IMI) in patients with imipenem-non-susceptible bacterial infections. Patients with hospital-acquired/ventilator-associated bacterial pneumonia (HABP/VABP), complicated intra-abdominal infection (cIAI), or complicated urinary tract infection (cUTI) caused by one or more imipenem-non-susceptible (but Colistin- and IMI/REL-susceptible) pathogens, were randomized 2:1 to receive IMI/REL or COL+IMI in a double-blind fashion. Colistin dosing was based on medical literature, and was consistent with recent regulatory guidance. Study therapy duration was to be 5-21 days for cUTI and cIAI, and 7-21 days for HABP/VABP.
The primary endpoint of the study was favorable overall response (defined by relevant endpoints for each different infection type) in the microbiological modified intent-to-treat (mMITT) population (defined as patients having a qualifying baseline pathogen and having received at least one dose of study treatment). Secondary endpoints included favorable clinical response at Day 28, 28-day all-cause mortality, incidence of treatment-emergent nephrotoxicity, and incidence of adverse events.
In the study, 31 of 47 randomized and treated patients met mMITT criteria. Favorable overall response was comparable for the IMI/REL (71.4%; n=15) and COL+IMI (70.0%; n=7) treatment arms. Favorable clinical response at Day 28 was higher in the IMI/REL arm (71.4%; n=15) compared to the COL+IMI (40.0%; n=4) arm, and 28-day all-cause mortality was lower in the IMI/REL arm (9.5%; n=2) vs. COL + IMI (30.0%; n=3), respectively.
Among all treated patients, drug-related adverse events occurred in 16.1% of patients (n=31) in the IMI/REL arm compared to 31.3% of patients (n=16) in the COL+IMI arm. Treatment-emergent nephrotoxicity was lower with IMI-REL (10%; 3/29 patients) compared to COL+IMI (56%; 9/16 patients) (p=0.002).
Second Pivotal IMI/REL Phase 3 study, RESTORE-IMI 2, ongoing
Merck is conducting a second pivotal Phase 3 clinical study, RESTORE-IMI 2, comparing treatment with imipenem/cilastatin/relebactam, as a fixed-dose combination, versus piperacillin/tazobactam in patients with hospital-acquired bacterial pneumonia or ventilator-associated bacterial pneumonia. The primary hypothesis of this study is that imipenem/cilastatin/relebactam is non-inferior to piperacillin/tazobactam in the incidence rate of all-cause mortality (www.ClinicalTrials.gov Identifier: NCT02493764).
Relebactam is an investigational, intravenous, class A and C beta-lactamase inhibitor currently being evaluated in combination with imipenem/cilastatin for the treatment of certain complicated Gram-negative bacterial infections. In preclinical studies, relebactam administered in combination with imipenem demonstrated antibacterial activity against a broad range of Gram-negative and beta-lactam-resistant pathogens. The U.S. Food and Drug Administration (FDA) has designated this combination as a Qualified Infectious Disease Product (QIDP) with designated Fast Track status for the treatment of hospital-acquired bacterial pneumonia, ventilator-associated bacterial pneumonia, complicated intra-abdominal infections and complicated urinary tract infections.
For more than a century, Merck, a leading global biopharmaceutical company 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. Through our prescription medicines, vaccines, biologic therapies and animal health products, we work with customers and operate in more than 140 countries to deliver innovative health solutions. We also demonstrate our commitment to increasing access to health care through far-reaching policies, programs and partnerships. Today, Merck continues to be at the forefront of research to advance the prevention and treatment of diseases that threaten people and communities around the world - including cancer, cardio-metabolic diseases, emerging animal diseases, Alzheimer’s disease and infectious diseases including HIV and Ebola. For more information, visit www.merck.com and connect with us on Twitter, Facebook, Instagram, YouTube and LinkedIn.
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Posted: April 2018
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