The unmethylated p15 became detectable, replacing the decrease of methylated p15. The activity of 40 μM PHI to reverse p15 methylation was similar to that of 2 μM of 5-Aza, a known inhibitor of DNA methylation or 1 μM of TSA, which was shown in endometrial cancer cells as a demethylating agent as it reduced DNMT3B level and de novo DNMT activity[22]. Here, DNMT1 is linked to endometrial cancer.