For example, in a CAC (colitis-associated cancer) mouse model, mice with deletion of IKKβ in enterocytes (exposed to AOM and DSS to induce tumor development) show dramatically decreased tumor incidence, but no reduction of tumor size.245 IKKβ-deficient enterocytes undergo apoptotic after a few days of exposure to AOM (azoxymethane) and DSS (dextran sulfate sodium salt), probably due to impaired expression of BCL-XL. The gene discussed is BCL2L1; the disease is neoplasm.