RedHill Biopharma receives additional US patent covering RHB-105 ahead of confirmatory Phase III study for H. pylori infection

Company has received a Notice of Allowance for an additional U.S. patent covering RHB-105, expected to be valid until 2034 once granted.

The patent application, entitled “Pharmaceutical Compositions For The Treatment Of Helicobacter Pylori” expands RedHill’s patent portfolio covering RHB-105 and is expected to be valid until 2034, once granted. The company is currently prosecuting additional US and international patent applications covering RHB-105.

“The grant of this new patent is an important addition to RedHill’s expanding IP portfolio covering RHB-105. On top of its extensive patent estate, RHB-105 was granted FDA QIDP designation under the Gain Act, providing for a total of 8 years of US market exclusivity,” said Danielle Abramson, RedHill’s Director of Intellectual Property & Research. “We are making good progress with preparations for the confirmatory Phase III study with RHB-105 for eradication of H. pylori, which follows the successful first Phase III study with RHB-105 and a positive meeting with the FDA regarding the path to marketing approval.”

H. pylori bacterial infection is a major cause of chronic gastritis, peptic ulcer disease, gastric cancer and mucosa-associated lymphoid tissue (MALT) lymphoma. H. pylori infection is estimated to affect half of the adult population worldwide. The growing resistance of the H. pylori bacteria to metronidazole and clarithromycin has resulted in increasing failure rates of current standard-of-care therapies (SoC) for H. pylori eradication, reaching an estimated 30%. Despite the strong unmet medical need, no new drug has been approved by the FDA for this indication in over a decade. The 2015 US and global market potential for H. pylori eradication therapies, at current branded prices, were estimated at approximately $1.45 billion and $4.83 billion, respectively, and could potentially grow with increasing awareness of the health risks associated with H. pylori infection and the benefits of its eradication.

RedHill announced in April 2016 that it had concluded a positive Type B Meeting with the FDA regarding the path to US marketing approval of RHB-105 and the planned confirmatory Phase III study. As a result of the productive and supportive feedback received from the FDA, RedHill is preparing for a confirmatory Phase III randomized, double-blind, active comparator, two-arm clinical study, comparing RHB-105 against a high dose amoxicillin and omeprazole regimen.

Subject to a successful outcome, the confirmatory Phase III study, and the supportive PK program to be completed prior to its initiation, are expected to complete the clinical package required for a US New Drug Application (NDA) for RHB-105.

RHB-105 was previously granted Qualifying Infectious Disease Product (QIDP) designation by the FDA, providing a Fast-Track development pathway, as well as NDA Priority Review status, potentially leading to a shorter NDA review time by the FDA, if filed. If approved, RHB-105 will also receive an additional 5 years of US market exclusivity, in addition to the standard exclusivity period, for a total of 8 years of US market exclusivity.

With RHB-105, RedHill is pursuing an indication of first-line treatment of H. pylori infection, regardless of ulcer status, a significantly broader indication than current standard treatments for H. pylori, which are typically indicated only for patients with active or recent history of duodenal ulcer disease. If approved, RHB-105 may be the first H. pylori eradication therapy to target this broader indication, which would significantly expand the potential patient population for this drug candidate.