Dendrogram showing the distribution of t(14;18)-positive cases of DLBCL (red).

This hierarchical clustering dendrogram was generated based on the genes in the GC B-cell gene expression signature previously described by Alizadeh et al.9 The positive and negative results of FISH for the t(14;18) are indicated as (+) or (−), whereas (NA) indicates that no material was available for FISH study.