As expected, the mRNA level of CDKN1A/p21 (P < 0.01; Fig. 4a) and CDKN1B/p27 (P < 0.01; Fig. 4b) were significantly increased in si-MALAT1 transfected MCL cell lines Mino and Jeko-1. This evidence concerns the gene CDKN1B and mantle cell lymphoma.