Fig. 2
From: Methotrexate resistance in relation to treatment outcome in childhood acute lymphoblastic leukemia
Kaplan–Meier analysis of the accumulation of MTX polyglutamates in relation to event-free survival (P logrank). Each survival curve is labeled with the EFS rates at 10 years and the number of patients included in each subgroup. The cut-off values used were 1935 pmol/109 cells for total accumulation of MTX polyglutamates and 1000 pmol/109 cells for long-chain MTX polyglutamates