To determine whether RP11-79H23.3 functions as a tumor suppressor, cellular apoptosis was evaluated by flow cytometry, Hoechst33342 staining, TUNEL (TdT-mediated dUTP Nick-End Labeling) assays, and Western blotting after transfection with pIRES2-RP11-79H23.3. This evidence concerns the gene DNTT and neoplasm.