Eighteen ALL patients with LOH on chromosome 6. Six ALL patients with LOH in very evaluable marker on chromosome 6 are not shown in the figure. Filled box (▪) indicates retention of two alleles. White box (□) indicates LOH. Diagonally striped box (▧) indicates that the marker was not informative and reversed stripes (▨) that the marker was not evaluable or not done. MSI indicates microsatellite instability.