33 Systemic sclerosis with digital ulcer disease Two randomised, double-blind, multi-centre, placebo-controlled trials have been conducted in 122 (Study AC-052-401, RAPIDS-1) and 190 (Study AC-052-331, RAPIDS-2) adult patients with systemic sclerosis and digital ulcer disease (either ongoing digital ulcers or a history of digital ulcers within the last year).