KD025 is an investigational medication undergoing testing to determine if it may be effective in the treatment of diffuse systemic sclerosis (skin thickening on more than just the hands). KD025 has previously been tested in graft-versus-host disease, idiopathic pulmonary fibrosis, and psoriasis. It has shown preliminary effectiveness and safety in the treatment of these conditions. This study will randomly assign subjects to one of three treatment groups, 20mg of KD025 twice per day, 20mg of KD025 once per day, and placebo. The study will measure the improvement, stabilization or worsening of your symptoms, such as changes in your fatigue and pain levels, lung function, skin thickness and other patient reported outcomes. The study treatment period will last 1 year. The drug may help mitigate symptoms of systemic sclerosis and thus may be helpful with the disease in study. The population to be enrolled in this study will involve patients diagnosed with systemic sclerosis, diffuse subset, 18 years of age or older.

This study is being conducted in order to test the safety of Brentuximab Vedotin in subjects with Diffuse Cutaneous Systemic Sclerosis. The study involves a Screening visit, a Baseline visit and 12 study visits occurring every 3 to 4 weeks, with enrollment lasting approximately 52 weeks, during which enrolled subjects will receive either the study compound or placebo.