Ras pathway mutations in relapsed ALL and their association with cytogenetics and event-free survival. Pie chart showing the proportion of patients with Ras pathway mutations (A). Histogram of Ras pathway mutations in relation to cytogenetic subgroups (B). Kaplan Meier overall and event-free survival curves of KRAS mutants (C and E) and NRAS mutants (D and F) compared with WT.