LAUSR

Key Points Question In children with acute lymphoblastic leukemia receiving oral mercaptopurine, can an intervention consisting of education and daily text message reminders to prompt directly supervised therapy result in a higher proportion of patients with mercaptopurine adherence 95% or higher, compared with education alone? Findings In this parallel-group, unblinded, randomized clinical trial including 444 children with acute lymphoblastic leukemia, the proportion of patients with mercaptopurine adherence rates 95% or higher did not differ between the intervention and education groups. In exploratory analyses, children aged 12 years and older with baseline adherence less than 90% had higher mean adherence in the intervention group. Meaning This study provides evidence for limiting future trials to older children with acute lymphoblastic leukemia who have low baseline adherence to oral mercaptopurine.