David Melnick
Analyst · Cowen. Please proceed with your questions
Thank you very much, Ankit, and good afternoon, everybody. We’ve continued to make significant progress on our pipeline programs throughout the second quarter and into what is now the early part of the third quarter. I’ll begin with our lead candidate, tebipenem HBr, an oral carbapenem that is currently being evaluated in our ADAPT-PO Phase III clinical trial. ADAPT-PO is a noninferiority trial comparing oral tebipenem head-to-head versus intravenously administered ertapenem, the carbapenem that is most commonly used for complicated UTI. The trial has completed enrollment of 1,372 patients in May, and all patient follow-up is now complete. Trial participants were randomized on a 1:1 basis and received either oral tebipenem or IV ertapenem for seven to 10 days. The primary endpoint of the trial is overall clinical and microbiologic response, and that includes eradication of the infecting pathogen at test of cure in the microbiological intent-to-treat population. We continue to anticipate reporting top line results from the trial in the third quarter of 2020. While we do not believe that the ongoing COVID-19 pandemic will impact our ability to report the ADAPT-PO top line data by the end of the third quarter, we announced today that our clinical research organizations, or CROs, are experiencing a reduced capacity to conduct, validate and analyze trials, which impact ongoing and planned Phase I trial timelines. As this relates to the tebipenem NDA submission, we expect this reduced CRO capacity to impact the Phase I trials that are required for NDA submission. Therefore, we now anticipate initiating a rolling NDA submission to the FDA for tebipenem HBr in complicated UTI in the first quarter of 2021 with completion of that submission in the second quarter, which is a change from our previous guidance of a completed NDA submission in the first quarter. We believe patients, payers and physicians alike would significantly benefit from the addition of an effective oral agent that keeps patients out of the hospital and restores the option to treat serious urinary tract infections caused by antibiotic-resistant uropathogens. Microbial surveillance data demonstrates that the prevalence of fluoroquinolone- and cephalosporin-resistant enterobacteriaceae continue to rise in both the hospital and community settings, and this severely limits the activity of the currently available oral antibiotics. ADAPT-PO does not include an IV lead-in the oral tebipenem arm, which is important because it will build the confidence of physicians to prescribe an oral antibiotic for complicated UTI as a replacement for IV therapy. Several recent clinical studies have demonstrated that substitution of oral antibiotic therapy in the place of IV antibiotic therapy has been an effective strategy treating serious infections, including endocarditis, skeletal infections and Gram-negative bacteremia. With approximately 60% bioavailability for tebipenem, an extensive pharmacokinetic and pharmacodynamic data derived from our Phase I studies, we feel confident that we’ll have sufficient drug onboard and at the site of infection to allow for treatment with an oral agent alone. This is further supported by Phase II data, which was previously generated by our Japanese partner, Meiji Seika, as well as an interim PK read in the ADAPT-PO trial that confirmed the PK/PD models supporting the dosing of tebipenem HBr. I would also highlight that tebipenem as a powder form has been marketed in Japan for over 10 years, so we were fortunate to have a significant safety database to add to the body of knowledge on this molecule. Moving on from 994 or tebipenem to SPR720, our oral drug candidate for the treatment of nontuberculous mycobacterial or NTM infections. We previously announced Phase I data in healthy patients demonstrating that repeated doses of 1,000 milligrams administered once daily were safe and well tolerated, and these are doses which we believe will produce clinical efficacy in patients. Following these results, we spoke with the FDA to review SPR720’s development pathway in NTM. Importantly, the FDA confirmed that our planned Phase IIa trial is the appropriate next step in development. Longer term, the development of SPR720 will be in combination with other antimicrobials, and trials would be designed to measure patient-reported outcomes. Subject to FDA acceptance of the IND for 720, which we expect in the second half of 2020, we plan to initiate a 28-day dose-ranging Phase IIa clinical trial, evaluating SPR720 as a monotherapy in NTM patients who are treatment-inexperienced. The goal of the trial is not only to assess the safety, tolerability and pharmacokinetics of SPR720 but also to assess the early microbiologic response to the drug candidate, an outcome that, if positive, will highlight the activity of SPR720 as a single agent in comparison to placebo. We continue to expect to initiate that Phase IIa trial in the second half of this year. On SPR206, our IV next-generation polymyxin agent that was developed as part of our potentiator platform, we continue to work towards advancing this compound in conjunction with our partners at the Department of Defense and Everest Medicines. We are advancing SPR206 based on previous Phase I data that demonstrated that the drug was well tolerated at a dose of 300 milligrams daily for 14 consecutive days in healthy volunteers, with no reported severe or serious adverse events as well as no evidence of nephrotoxicity or clinically significant changes in laboratory tests. The absence of nephrotoxicity at/or above the predictive therapeutic dose clearly differentiates SPR206 from earlier generation polymyxins. We announced in our press release that we are delaying the initiation of our Phase I bronchoalveolar lavage, or BAL, clinical trial from the second half of 2020 into the first half of 2021 due to COVID-19-related delays at our CROs. We continue to expect to initiate a renal impairment study for SPR206 in 2021. I will now turn the call over to Cristina Larkin, our Chief Operating Officer, who will provide you with a review of the market opportunity for our pipeline products.