Several genetic studies reported that the human CRY2 gene is associated with mood regulation, cancer and glucose homeostasis (Dupuis et al., 2010; Hoffman et al., 2010; Kovanen et al., 2013; Lavebratt et al., 2010; Sjöholm et al., 2010; Zhang et al., 2013). This evidence concerns the gene CRY2 and cancer.