TLBZT and 5-FU induced apoptosis in CT26 carcinoma. After three weeks treatment, CT26 carcinomas were collected and subjected to TUNEL assay (3 tumors/group) and observed under microscope (×200) (A). The apoptotic cells were counted in 3 high power fields (HPF) in each slide. The percentage of apoptosis cells were expressed as means ± SD (B). **P<0.01, versus control group. ##
P<0.01, versus TLBZT group, Δ
P<0.05, versus 5-Fu group.