The prevalence of clinical extensive chronic GVHD among bone marrow (BM) and PBSC recipients surviving without relapse. Patients were considered to have ongoing clinical extensive chronic GVHD if they had been diagnosed with clinical extensive chronic GVHD and continued to receive immunosuppressive drugs. Note that the horizontal axis scale between 0 and 2 years differs from that between 2 and 8 years posttransplant.