RecruitingPhase 3Drug trialEvaluation of Rovadicitinib Compared to the Protocol Selected by Researchers in Third Line and Subsequent Studies of Moderate to Severe Chronic Graft-versus-host DiseaseThe aim of this study is to demonstrate that in subjects with moderate to severe chronic graft-versus-host disease in the third line and beyond, the use of rosuvastatin compared to the protocol chosen by the researchers can significantly improve the objective response rate of subjects at week 24.