CCND1 and gastric cancer: Previously, increased transcription levels of c-myc, cyclin D1, c-jun, Wisp1 and Birc5 in the development and progression of gastric cancer were reported (Valenta et al., 2012; Gurbuz and Chiquet-Ehrismann, 2015; Peng et al., 2016; Liu et al., 2019).