Effects of TLBZT and 5-FU on cell senescence in CT26 carcinoma. A, after three weeks treatment, CT26 carcinomas (3 tumors/group) were removed and frozen cut into 7μm sections, fixed, reacted with SA-β-gal staining solution overnight and observed under microscope (×200). B, SA-β-gal positive staining was counted in 3 HPF in each slide and expressed as fold over control. **P<0.01, versus control group, ##
P<0.01, versus TLBZT group, #
P<0.05, versus TLBZT group.