CASP3 and neoplasm: The F3.CD-TK regimen group had the highest rate of apoptotic tumor cells (i.e., activated caspase 3+ G55 cells/per section; confocal images in Figure 5J, left panel): 14.9 ± 1.6/F3.CD-TK+5FC&GCV vs. 6.6 ± 1.9/F3.CD+5FC or 1.1 ± 2.1/cell debris+5FC&GCV (p < 0.05, one-way ANOVA with Tukey’s post hoc test; n = 6 rats/group; Figure 5J: right panel).