Findings disclosed from Synlogic Inc.'s phase Ib/IIa trial with SYNB-1020 in hyperammonemia surprised the company and Wall Street, dealing a blow to the compound but leaving in place the Synthetic Biotic platform, which genetically engineers probiotic microbes.

Although the placebo response proved better than expected in Chiasma Inc.'s phase III trial of Mycapssa (octreotide) capsules for acromegaly, "we believe that the response of the patients on Mycapssa is the clinically relevant indicator," said William Ludlam, the Waltham, Mass.-based firm's senior vice president of clinical development and medical affairs.