Abstract: The method and the kit are useful as tools for classifying a patient diagnosed with mantle cell lymphoma into the category of: indolent or conventional. The method comprises: a) providing a sample from a patient suffering from mantle cell lymphoma; b) determining the level of expression of at least one gene selected from the group consisting of: RNGTT, HDGFRP3, FARP1, HMGB3, LGALS3BP, PON2, CDK2AP1, DBN1, CNR1, CNN3, SOX11, SETMAR and CSNK1E in said sample; and c) comparing the level of expression of each of the measured genes with respect to the level of expression of the same genes in a control sample; wherein the absence of expression or the underexpression of said genes with respect to the same genes in said control sample is indicative of the indolent clinical course of the MCL.