Chronic GVHD incidence. (A) Overall incidence of chronic GVHD. Dashed line, incidence of all chronic GVHD; solid line, incidence of corticosteroid-requiring chronic GVHD. (B) Incidence of chronic GVHD stratified by donor type. Dotted line, incidence of all chronic GVHD, matched related donors; solid line, incidence of corticosteroid-requiring chronic GVHD, matched related donors; dot-dash line, incidence of all chronic GVHD, matched unrelated donors; dashed line, incidence of corticosteroid-requiring chronic GVHD, matched unrelated donors.