“We clearly see an active drug here,” PTC Therapeutics Inc. CEO Matthew Klein said of the 15-lipoxygenase inhibitor vatiquinone for Friedreich’s ataxia (FA), tested in a phase III study called Move-FA that missed the primary endpoint of statistically significant change in modified FA Rating Scale score at 72 weeks. The company will “take one step at a time” decisions about the drug, analyzing the results and then consulting with the U.S. FDA regarding how to proceed, he said. Meanwhile, Wall Street wasn’t happy, and South Plainfield, N.J.-based PTC’s shares (NASDAQ:PTCT) closed May 24 at $46.95, down $11.46, or 19.6%.