highly significantp << 0.01
The statistical analysis of the antitumor effect by two-way ANOVA shows that, while the control and lignin-treated groups are not statistically different, proving that lignin itself does not cause any significant antitumor effect, there is highly significant statistical difference ( p << 0.01) of the averages of calculated volumes of all the three treated tumor groups ( Figure 4 A) as well as the final masses of the excised tumors at day 14 ( Figure 4 E).