Kaplan-Meier plot of overall survival for patients with ALL based on distance to treatment center. At 60 months, the overall survival rate was 77%, 82%, 83% and 77% for patients ≤10 miles, >10 to ≤20 miles, >20 to ≤50, and >50 miles to treatment center, respectively. In this analysis, which does not incorporate covariates, overall survival was not significantly different for those ≤10 miles and those >50 miles. However, inferior survival was seen for those >50 miles from treatment center versus those who were>10 to ≤20 miles or >20 to ≤50 miles.