As expected, Aldeyra Therapeutics Inc. received a complete response letter (CRL) from the U.S. FDA regarding its NDA for reproxalap in dry eye disease, with the agency requiring “at least one” additional study to prove efficacy of the reactive aldehyde species, or RASP, modulator.
Investors awaiting the announcement of a partnering deal for RASP modulator reproxalap ahead of the drug’s Nov. 23 PDUFA date were in for a rude awakening, as Aldeyra Therapeutics Inc. disclosed that the U.S. FDA had raised issues with the NDA, putting its imminent approval in dry eye disease in doubt. The update, disclosed in an SEC filing, sent shares (NASDAQ:ALDX) sinking 66%, or $3.60, to close Oct. 16 at $1.83.
Aldeyra Therapeutics Inc. CEO Todd Brady said that, with new data from a crossover trial with reproxalap in dry eye disease (DED), the question of “approvability has been put to bed,” and the company plans a pre-NDA meeting with U.S. FDA in the third quarter of this year.
Lexington, Mass.-based Aldeyra Therapeutics Inc.’s phase III win in the study called Invigorate with reproxalap for allergic conjunctivitis (AC) restarted speculation about odds of the drug, a small-molecule, immune-modulating covalent inhibitor of reactive aldehyde species (RASP), to treat dry eye disease (DED). “I do think there is potential read-through,” CEO Todd Brady said, especially with regard to the redness endpoint. A six-week safety study necessary before going to the FDA has not yet started, he told investors during a conference call. “That will require some discussions with the FDA, but I do not think, given the length of the trial, the safety study would impair our guidance of potentially filing NDAs by the end of this year.”