For a comprehensive characterization of the epigenetic make-up of the critical region at 13q14.3 in CLL cells, DNA-methylation of the whole region (from ITM2B Gene ID: 9445 to DLEU7) was quantified in primary patient and healthy proband samples (Table S1 for patient and Table S2 for healthy proband characteristics). The gene discussed is ITM2B; the disease is B-cell chronic lymphocytic leukemia.