Figure 2C shows that mice fed with normal chow show a 2.4% mitotic index, very similar to that seen in mice fed with balanced diet tumor (2.6%). In contrast, tumors from mice fed with a ω-6-rich diet exhibited a higher percent of mitotic index (6.6%) (** p < 0.01). To validate these results, we performed MCM2 detection by immunostaining (Figure 2D). As expected, mice fed with a ω-6-rich diet showed higher expression of MCM2 than mice fed with control or PUFA-balanced diets (** p < 0.01 and * p < 0.05, respectively). Here, MCM2 is linked to neoplasm.