Survival analysis of patients stratified by expression of eukaryotic translation elongation factor 1 delta ( EEF1D ). Kaplan-Meier analysis of overall survival in 64 patients with medulloblastoma based on Hu6800FL array data for the 8q-mapped candidate gene, eukaryotic translation elongation factor 1 delta (EEF1D). We calculated the mean between the median expression level of tumors with 8q gain and the median level of those without it. Patients were stratified into two groups based on their tumor expression level relative to that mean. Follow-up is expressed as time from diagnosis in months.