Missing the mark? Exploratory analysis of the 10-year-old cutoff as an independent marker of high-risk disease in pediatric B-ALL.

This single-center, retrospective study evaluated age as a risk factor for relapsed/refractory disease and/or death in 153 children with B-cell acute lymphoblastic leukemia. The study sample included children near the 10-year age cutoff for high-risk disease (6.0-13.9 years at diagnosis) and without other high-risk features (high white cell count, unfavorable cytogenetics). Children 10.0-13.9 years treated per high-risk protocols did not have inferior outcomes compared with children aged 6.0-9.9 years initiating treatment per standard-risk protocols. The study indicates that, in the era of cytogenetics, an age threshold of 10 years might not be an independent prognostic marker. Multicenter analyses are needed.