Clostridium difficile Treatment – Phase 3 program outline —
SUMMIT OUTLINES PHASE 3 PROGRAMME FOR NOVEL CDI ANTIBIOTIC RIDINILAZOLE FOLLOWING FDA AND EMA REGULATORY MEETINGS
Oxford, UK, On 1 February 2017 – Summit Therapeutics plc
the drug discovery and development company advancing therapies for Duchenne muscular dystrophy and C. difficile infection (‘CDI’), outlines its Phase 3 programme for its novel antibiotic, ridinilazole, following recent regulatory meetings with the US Food and Drug Administration (‘FDA’) and European Medicines Agency (‘EMA’).
With input from the FDA and EMA, Summit intends to design the Phase 3 clinical programme to evaluate superiority of ridinilazole over standard of care in the treatment of C. diffiicle Infection (CDI).
A positive Phase 3 result on superiority has the potential to support the commercial launch of ridinilazole as a differentiated therapy that can both treat initial CDI and reduce disease recurrence.
Mr Glyn Edwards, Chief Executive Officer of Summit commented: “The constructive end of Phase 2 meetings with the US and European regulators have enabled us to design a Phase 3 programme that focuses on evaluating ridinilazole’s superiority over standard of care. This is something we believe would help differentiate our novel class antibiotic from currently marketed CDI treatments and those in late-stage development. Superiority in the combined measure of treatment of initial infection and importantly, reduction in recurrence, could position ridinilazole for front-line treatment of CDI.”
Summit discussed its Phase 3 development programme with the FDA at an End of Phase 2 meeting and through a scientific advice process with EMA. With input from both agencies, the Phase 3 programme is expected to include two trials evaluating ridinilazole as compared to the standard of care, vancomycin, each of which would enrol approximately 700 patients with CDI with the primary endpoint being superiority in sustained clinical response (‘SCR’). Other planned endpoints will include health economic outcome measures. The Phase 3 trial designs are consistent with the successful proof of concept Phase 2 trial, CoDIFy, in which ridinilazole achieved statistical superiority over vancomycin in SCR. SCR is a combined endpoint that measures cure at the end of treatment and a lack of recurrence in the 30 days after treatment. FDA also confirmed that ridinilazole would be eligible for Priority Review based on its QIDP designation.
Mr Edwards continued: “As we continue to evaluate our options to maximize the value of ridinilazole, our stronger financial position following the DMD programme partnership with Sarepta Therapeutics, Inc. means Summit has more time to fully explore all options. These include potentially entering into a collaboration with a third party or securing meaningful non-dilutive funding from government and charitable organizations. In parallel, activities
Ridinilazole is an orally administered small molecule antibiotic that Summit is developing specifically for the treatment of CDI.
In preclinical efficacy studies, ridinilazole exhibited a narrow spectrum of activity and had a potent bactericidal effect against all clinical isolates of C. difficile tested. In a Phase 2 proof of concept trial in CDI patients, ridinilazole showed statistical superiority in sustained clinical response (‘SCR’) rates compared to the standard of care, vancomycin. In this trial, SCR was defined as clinical cure at end of treatment and no recurrence of CDI within 30 days of the end of therapy. Ridinilazole has received Qualified Infectious Disease Product (‘QIDP’) designation and has been granted Fast Track designation by the US Food and Drug Administration. The QIDP incentives are provided through the US GAIN Act and include an extension of marketing exclusivity for an additional five years upon FDA approval.
About Summit Therapeutics
Summit is a biopharmaceutical company focused on the discovery, development and commercialization of novel medicines for indications for which there are no existing or only inadequate therapies. Summit is conducting clinical programs focused on the genetic disease Duchenne muscular dystrophy and the infectious disease C. difficile infection.