FIGURE 4. Histomorphometric analyses of apoptotic and proliferative cells (as indicated by TUNEL technique [A] or PCNA staining [B]) in WT-MH3924A and hANG-MH3924A tumors. Cell density (nuclei/mm2) or percentage of positive cells was quantified by analyzing 5 ROIs (n = 6 each group). Values are shown as mean + SEM (***P < 0.001; **P < 0.01 vs. WT-MH3924A).