In the next step, the influence of selected microRNAs (miR-17-5p, miR-20b-5p, miR-106b-5p) on DUSP2 mRNA level was validated in WSU-DLCL2 cells a cell line derived from a diffuse large B-cell lymphoma (DLBCL). The gene discussed is DUSP2; the disease is diffuse large B-cell lymphoma.