Reduced-intensity chemotherapy with tyrosine kinase inhibitor followed by allogeneic transplantation is effective in patients with Philadelphia chromosome-positive acute lymphoblastic leukemia Jung Min Lee1, Do Young Kim2, Hee Jeong Cho1, Joon Ho Moon1, Sang Kyun Sohn1, Ho Jin Shin1, Young Rok Do3, Mi Hwa Heo3, Min Kyoung Kim4, Young Seob Park4, and Dong Won Baek1