Acute lymphoblastic leukemia (ALL) is a disease that affects immature lymphocytes in the blood and presents a high prevalence rate in children and adolescent young adult (AYA) populations (15-39 years). AYAs are a unique group who face a significant therapeutic disadvantage when treated with the adult regimen, as evident with lower remission rates, whereas the opposite is true in children. A recent study by EUROCARE-5 showed a marked decrease with age in 5 years relative to survival outcomes based on cancer registries of 27 European countries: 85.8% for patients 0-14 years of age and a decreased 62.2% and 52.8% for patients 15-19 and 20-39 years, respectively. There is growing evidence demonstrating that the pediatric ALL treatment regimen is effective and beneficial when treating AYAs. Treatment of ALL in AYAs around the world is showing improved remission rates with therapeutic advancements and increasing amount of data available with updated clinical trials and regimens. The addition of l-asparaginase into adult treatment regimens has significantly increased the remission rates. This administration to AYAs is more difficult but shows a positive benefit in comparison with the toxicity ratio. This review article will discuss the controversy of AYA patients diagnosed with ALL treated with pediatric or adult protocols and their perspectives in Poland and will focus on ALL etiology, epidemiology, and prognostic factors with comparison of compliance of medications between both populations of patients.