Abstract: An object of the present invention is to provide a test method for MALT lymphomas for providing genetic diagnosis data which can be used for the diagnosis of MALT lymphomas, identification of disease type, and prediction of progression of pathological conditions and onset thereof and a kit for implementing the method. At least two types of tumor-suppressor genes or cancer-related genes are selected, in particular, at least two types of genes are selected from a gene group consisting of 11 genes in a sample, and the expression levels or the gene expression regulation status of the selected genes are investigated. Early detection and diagnosis with high sensitivity and accuracy can be conducted by quantitatively determining the genetic product and preparing the expression profiles of the gene group on the basis of the results, or by detecting methylation frequencies to analyze the expression regulation.