Correspondence analysis identifies the two Mantle cell lymphoma subgroups. The gene expression data are projected on the first two principal axes. The patients can be clearly separated by this exploratory analysis considering the 3.000 genes (red dots) of the highest variance. In the correspondence plot this is indicated by the horizontal separation line. The patients are labelled with "s" and "b" which represent the separation by the median of the proliferation signature into two different entities. Patients with a proliferation signature value smaller than the median are marked with ”s“ and the other patients with ”b“.