Summit Outline Phase 3 Programme for Novel CDI Antibiotic Ridinilazole


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Summit Outline Phase 3 Programme for Novel CDI Antibiotic Ridinilazole


Oxford, UK 

Mr Glyn Edwards, Chief Executive Officer of Summit commented:

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 maximise 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 organisations. In parallel, activities to prepare ridinilazole for Phase 3 trials continue with these anticipated to start in the first half of 2018.”

CompanySummit Therapeutics plc
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