MassARRAY assay of 25 candidate genes in seven MCL cell lines and normal B cells showed 20 genes hypermethylated in more than one MCL cell line, encompassing cell differentiation (SOX9), cell adhesion (CDH1), cell cycle (GOS2) and apoptosis (LGALS3), p53 pathway (CDC14B) and PI3K pathway (THEM4), transcription factors (AHR, HOXA9, NR2F2, FOXC1, TWIST1) and others with unknown functions (ROBO1, NPTX2, CYB1B1, GPX3, MAL, PAX6, PTPRG1, TFPI2). The gene discussed is HOXA9; the disease is mantle cell lymphoma.