This is a phase1, randomized sequence of placebo, low-, mid- and high-dose CST-2032 in Subjects with cognitive impairment. Sixteen (16) subjects with cognitive impairment will be enrolled. The first subject enrolled will be dosed as a sentinel. If no significant safety issues are noted in the sentinel subject, the remaining subjects will be dosed starting 24 hours after the Day 4 dose for the sentinel subject.~Subjects will have the option to attend all study visits as outpatients or be admitted for a 4-5-night confinement period at the research facility. Subjects will receive matching placebo for CTS-2032, 1mg, 3mg, and 9 mg CST-2032 two hours after a pre-administered dose of 3 mg CST-107 in a randomized sequence on Days 1, 2, 3 and 4.~Cognitive assessments (CANTAB) and a verbal fluency test will be administered daily. If operationally feasible, subjects will also undergo arterial spin labeling (ASL) magnetic resonance (MRI) imaging of the brain on Days 1 and 4.
This study will evaluate the effects of CST-2032 when administered with pre-administered CST-107 on safety, tolerability, cognition, cerebral perfusion, and cerebral metabolism in patients with cognitive impairment.