Acute Lymphocytic leukemia (ALL) is the most common cancer in children. 139 patients were diagnosed with ALL at National Children’s Hospital - Hanoi- Vietnam from January/2107 to June/2018. Karyotype analysis and Fluorescence hybridization (FISH) techniques were applied to detect chromosomal abnormalities. | Cytogenetic findings of patients with acute lymphoblastic leukemia in national children’s hospital from january, 2017 to june, 2018