Anemia 1 modest severity 2 normochromic normocytic A, poikilocytosis ; common 3 pathogenesis i) RBC 생성 ... relapse rate; high 1 persistence of leukemia in the pts 2 persistence of frozen BM 3 both 5. approaches proposed ... Autologous or allogenic bone marrow transplantation Etiology and Epidemiology * Incidence 5/10,000 in U.S.A.