Part 3 is a double-blind, randomized, placebo-controlled assessment of multiple oral ascending doses of CORT118335. Subjects will be enrolled sequentially into 1 of up to 4 cohorts (Cohorts A to D), each containing 12 subjects. Within each cohort, 9 subjects will be randomly assigned to receive CORT118335 and 3 subjects to receive matching placebo daily for 14 days. There is an option (Sponsor decision) for the last cohort (Cohort D) to undergo prednisone challenge before and after treatment with CORT118335 or placebo to study the effects of CORT118335 on the response to prednisone challenge.