NRDC and cancer: Although some studies focused on other circadian clock genes (such as casein kinase 1ε (CK1ε), receptor subfamily 1 group D member 1/2 (NRD1/2), RAR-related orphan receptor A and B (RORA/B), timeless (Tim) and timeless-interacting protein (Tipin)) and cancers prognosis, these data were not sufficient to meta-analyze HR or OR of these circadian clock genes [13, 23, 29, 49].