Nicox announced the submission of a new drug application (NDA) to the FDA for approval of AC-170, its novel, proprietary, cetirizine eye drop formulation, for the treatment of ocular itching associated with allergic conjunctivitis, according to a company news release. Based on clinical pediatric data generated with AC-170, the company also requested a priority review, which, if obtained, could result in an FDA decision by the end of 2016 based on PDUFA (Prescription Drug User Fee Act) performance goals.
"The submission of the first NDA resulting from our acquisition of Aciex in October 2014 is a major milestone in the company's history and a significant step forward in our commitment to delivering new ophthalmology treatment options to patients," Michele Garufi, Chairman and Chief Executive Officer of Nicox, said in the news release. "If successful in obtaining priority review, we would have two compounds - AC-170 and latanoprostene bunod, licensed to Bauch + Lomb, - potentially receiving FDA approval in the United States by the end of 2016. This would be a remarkable achievement for Nicox, and almost unique in the panorama of European biotech companies."
The FDA has a 60-day filing review period to determine whether the NDA is complete and acceptable for filing, and to confirm if the priority review has been granted. Nicox expects to communicate the agency's decision.
AC-170 is a novel formulation of cetirizine, the active ingredient in Zyrtec 1, which has been developed for the first time for topical application in the eye for the treatment of ocular itching associated with allergic conjunctivitis. Cetirizine is a second generation antihistamine and mast cell stabilizer that binds competitively to histamine receptor sites to reduce swelling, itching and vasodilation. Cetirizine, as an approved oral drug, has a well-characterized systemic safety and efficacy profile with worldwide exposure representing more than 300 million patient-years2-3-4. AC-170 is covered by two granted US patents expiring in 2030 and 2032.
Two phase 3 safety and efficacy trials have been completed using the conjunctival allergen challenge (CAC) model of allergic conjunctivitis. Both phase 3 clinical trials demonstrated statistically significant results for AC-170 compared to vehicle control (placebo) for the primary endpoint of ocular itching. Treatment emergent adverse events were similar in severity and frequency within the active and placebo groups.
Nicox held two pre-NDA meetings with the FDA regarding AC-170 for both its clinical development program and its chemistry, manufacturing, and controls aspects, respectively and the FDA recommended submission of the NDA.
Nicox is seeking regulatory approval for AC-170 utilizing the FDA's Section 505(b)(2) regulatory pathway, which enables the company to rely, in part, on the FDA's prior findings of safety and efficacy for cetirizine and on the published literature, in support of the NDA. Approval of the AC-170 NDA prior to December 1, 2016 will trigger a milestone payment of $35 million in Nicox shares to ex-Aciex shareholders or $10 million in Nicox shares if approval of the NDA is received after this date. AC-170 was developed by Aciex Therapeutics, which became a wholly owned subsidiary of Nicox in October 2014 and was subsequently renamed Nicox Ophthalmics.
"AC-170 is the first ocular product which utilizes the well-known antihistamine cetirizine," Mike Bergamini, Chief Scientific Officer and Executive Vice President of Nicox, said in the news release. "The established safety and efficacy of this molecule, administered orally, is widely recognized by physicians, and our goal is for AC-170 to become a trusted medicine for the estimated 75 million Americans who currently suffer from allergic conjunctivitis."