CASP3 and neoplasm: The 20 Gy/5F+USMB (32.8±5.1% of the tumour area stained for caspase-3) regimen showed significantly increased caspase-3 activity compared to that of the untreated (0 Gy, 14.1±3.3%, P<0.001) and 20 Gy/5F (18.6±2.0%, P<0.01) groups.