This clinical trial is for men and women with newly diagnosed with acute Graft vs Host Disease (GvHD).
The purpose of this study is to evaluate if CYP-001 can be effective to treat GvHD that has not responded to steroids.
The study drug used in this study (CYP-001) is experimental. This means that it is not an approved treatment for high-risk acute GvHD by the U.S. Food and Drug Administration (FDA) or anywhere in the world.