We report a case with leukoplakia of the tongue as a manifestation of chronic graft versus host disease after allogeneic stem cell transplantation for acute promyelocytic leukemia treated with Clostridium butyricum tablets. His leukoplakia subsequently disappeared and his regulatory T cells increased after three months.
Keywords: Chronic graft-versus-host disease; Clostridium butyricum; Leukoplakia; Regulatory T cell.
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