From the data herein reported, it emerges that epigenetic modifications of the ES by means of DNA methylation, histone acetylation/deacetylation at the CNR1, and FAAH genes encoding the CB1 receptor and FAAH hydrolysing enzyme may play a relevant role both in physiological processes regulating (male) fertility and reproduction as well as in disease pathogenesis and progression including cancer. The gene discussed is FAAH; the disease is cancer.