Press Release: Basilea: ERADICATE phase 3 study results highlight the potential role of ceftobiprole in the treatment of Staphylococcus aureus bacteremia (SAB)

-- Late breaker presentation at IDWeek 2022

-- First double-blind registrational phase 3 study in Staphylococcus aureus

bacteremia

-- Ceftobiprole non-inferior to daptomycin, meeting primary endpoint and

demonstrating similar secondary efficacy outcomes

Basel/Allschwil, Switzerland, October 24, 2022

Basilea Pharmaceutica Ltd (SIX: BSLN), a commercial-stage biopharmaceutical company committed to meeting the needs of patients with severe bacterial and fungal infections, reported today that data from the successfully completed phase 3 ERADICATE study(1), evaluating ceftobiprole in the treatment of adult patients with bacterial bloodstream infections caused by Staphylococcus aureus, (SAB), have been presented at the scientific conference, IDWeek 2022, which took take place in Washington, D.C. from 19 to 23 October.

Dr. Marc Engelhardt, Chief Medical Officer of Basilea stated: "The positive results from ERADICATE together with previous positive phase 3 study results in acute bacterial skin and skin structure infections and community-acquired pneumonia support the broad utility of ceftobiprole for treating serious bacterial infections and enable us to proceed with an NDA submission of ceftobiprole in the U.S."

Dr. Thomas Holland, M.D., Associate Professor of Medicine at Duke University School of Medicine and chair of the ERADICATE Data Review Committee, who presented the data at IDWeek, said: "More than 15 years after the last approval of a new antibiotic for SAB in the U.S., ERADICATE is the first double-blind registrational study for Staphylococcus aureus bacteremia. ERADICATE included patients with a broad spectrum of underlying conditions and complications of SAB. Ceftobiprole showed comparable efficacy to daptomycin and it was also well tolerated. This supports ceftobiprole becoming a new treatment option for complicated SAB, which remains an area of high medical need."

The randomized, double-blind, multicenter phase 3 study ERADICATE was a global study, performed in 60 study centers in 17 countries from August 2018 to March 2022.

390 patients were randomized to ceftobiprole or daptomycin, with or without intravenous aztreonam for coverage of Gram-negative pathogens, for up to 42 days of treatment.

Patient characteristics in the 387 patients included in the modified intent-to-treat (mITT) population were balanced between the ceftobiprole and daptomycin treatment groups.

As presented at IDWeek, ceftobiprole met the primary endpoint by demonstrating non-inferiority versus daptomycin, with or without aztreonam. The overall success rate, assessed by a blinded independent Data Review Committee consisting of five experienced U.S. infectious disease specialists, was 69.8% with ceftobiprole, compared to 68.7% with daptomycin, in the mITT population at 70 days post randomization. The statistically adjusted difference between ceftobiprole and daptomycin for overall success was 2.0% (95% confidence interval: -7.1% to 11.1%) and thus well within the pre-specified non-inferiority margin of 15%. Results for the primary efficacy outcomes were consistent in key subgroups including in patients with MSSA or MRSA bloodstream infections at baseline, and in various categories of underlying conditions such as skin and skin structure infections, abdominal abscesses, chronic dialysis, septic arthritis, osteomyelitis, definite right-sided infective endocarditis and in patients with persistent SAB.

Secondary efficacy outcomes such as the overall success rate in the clinically evaluable population (77.9% in the ceftobiprole group, 77.8% in the daptomycin group), microbiological eradication (82.0% in the ceftobiprole group, 77.3% in the daptomycin group), all-cause mortality (9.0% in the ceftobiprole group, 9.1% in the daptomycin group) and the emergence of new SAB complications (5.8% in the ceftobiprole group, 5.6% in the daptomycin group) were also similar between the two treatment groups at 70 days post-randomization in the mITT population.

The median time to Staphylococcus aureus bloodstream clearance for MSSA was 3 days with ceftobiprole and 4 days with daptomycin, and 5 days for MRSA for both ceftobiprole and daptomycin.

Emergence of resistance under treatment was observed in three patients on daptomycin. No emergence of resistance under treatment was observed with ceftobiprole

Both treatments were well tolerated. The overall rate of adverse events was similar between the ceftobiprole and daptomycin groups. In line with the known safety profile of ceftobiprole, gastrointestinal disorders were more frequent with ceftobiprole compared to daptomycin, mainly driven by mild to moderate nausea.

Basilea is planning to submit a New Drug Application (NDA) for ceftobiprole to the U.S. Food and Drug Administration (FDA) around year-end 2022.

Ceftobiprole at IDWeek 2022

LB2302 - Late Breaking Clinical Trials

- Ceftobiprole Compared to Daptomycin With or Without Optional

Aztreonam for the Treatment of Complicated Staphylococcus

aureus Bacteremia (SAB): Results of a Phase 3, Randomized,

Double-Blind Trial (ERADICATE) -- Thomas L. Holland, Sara

E. Cosgrove, Sarah B. Doernberg, Oleksandr Pavlov, Ivan

Titov, Boiko Atanasov, Maziar Assadi Gehr, Marc Engelhardt,

Kamal Hamed, Daniel Ionescu, Mark Jones, Mikael Saulay,

Jennifer Smart, Harald Seifert, Timothy C. Jenkins, Nicholas

A. Turner, Vance G. Fowler Jr.

For further information please visit https://www.eventscribe.net/2022/IDWeek/.

About ceftobiprole

Ceftobiprole medocaril, the prodrug of the active moiety ceftobiprole, is a cephalosporin antibiotic for intravenous administration, with rapid bactericidal activity against a wide range of Gram-positive and Gram-negative bacteria. This includes methicillin-susceptible and resistant Staphylococcus aureus (MSSA, MRSA) and susceptible Pseudomonas spp.(2) The brand is currently approved and marketed as Zevtera and Mabelio in a number of countries in Europe and beyond for the treatment of adult patients with hospital-acquired bacterial pneumonia (HABP), excluding ventilator-associated bacterial pneumonia (VABP), and for the treatment of community-acquired bacterial pneumonia (CABP). Basilea has entered into license and distribution agreements in Europe, Eurasian countries, Latin America, China, Canada, Israel, and the Middle East and North Africa (MENA) regions.

About the ceftobiprole phase 3 program

The ceftobiprole phase 3 program comprised two phase 3 studies, which were conducted under Special Protocol Assessment (SPA) agreements with the U.S. FDA. The first study of the program, ERADICATE, compared the safety and efficacy of intravenous ceftobiprole medocaril with intravenous daptomycin (with or without intravenous aztreonam) in the treatment of complicated Staphylococcus aureus bacteremia.(1) The second study, TARGET, was a randomized, double-blind, multicenter phase 3 study, which enrolled 679 patients with acute bacterial skin and skin structure infections (ABSSSI) and compared the safety and efficacy of intravenous ceftobiprole medocaril with intravenous vancomycin plus intravenous aztreonam.(3) The TARGET study was conducted at more than 30 clinical centers in the U.S. and Europe and reported positive results in 2019.

Basilea's ceftobiprole phase 3 program is funded in part (up to USD 136.4 million, which is approximately 70% of the total potential program costs) with federal funds from the U.S. Department of Health and Human Services; Administration for Strategic Preparedness and Response; Biomedical Advanced Research and Development Authority (BARDA), under contract number HHSO100201600002C.

About Staphylococcus aureus bacteremia (SAB)

Staphylococcus aureus bacteremia is a leading cause of bloodstream infections, responsible for a broad variety of complications and has been associated with significant morbidity and a mortality of 20 to 40%.(4,) (5) Several studies have demonstrated that MRSA bacteremia is associated with a significantly higher mortality rate compared with MSSA bacteremia.(6) (,) (7) Infections of the inner lining of the heart or heart valves (infective endocarditis) and bone infections (osteomyelitis) are common complications of SAB.

About Basilea

Basilea is a commercial-stage biopharmaceutical company founded in 2000 and headquartered in Switzerland. We are committed to discovering, developing and commercializing innovative drugs to meet the needs of patients with severe bacterial and fungal infections. We have successfully launched two hospital brands, Cresemba for the treatment of invasive fungal infections and Zevtera for the treatment of bacterial infections. In addition, we have several preclinical anti-infective assets in our portfolio. Basilea is listed on the SIX Swiss Exchange (SIX: BSLN). Please visit basilea.com https://www.globenewswire.com/Tracker?data=8N9QGi6s7K0XA8m3cQL3bRzkt6_zfc-z_ltYhQVqT18seadDK99HDzogGRaUth8PmrU0UV4lkJd4BxyuaWquIQ==.

Disclaimer

This communication expressly or implicitly contains certain forward-looking statements, such as "believe", "assume", "expect", "forecast", "project", "may", "could", "might", "will" or similar expressions concerning Basilea Pharmaceutica Ltd and its business, including with respect to the progress, timing and completion of research, development and clinical studies for product candidates. Such statements involve certain known and unknown risks, uncertainties and other factors, which could cause the actual results, financial condition, performance or achievements of Basilea Pharmaceutica Ltd to be materially different from any future results, performance or achievements expressed or implied by such forward-looking statements. Basilea Pharmaceutica Ltd is providing this communication as of this date and does not undertake to update any forward-looking statements contained herein as a result of new information, future events or otherwise.

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