[1] Univ Texas MD Anderson Canc Ctr, Dept Leukemia, Houston, TX 77030 USA
[2] Univ Texas MD Anderson Canc Ctr, Dept Hematopathol, Houston, TX 77030 USA
[3] Texas Childrens Hosp, Histiocytosis Program, Texas Childrens Canc Ctr, Houston, TX 77030 USA
[4] Yerevan State Med Univ, Dept Oncol, Yerevan, Armenia