CCND1 and cancer: The results indicated a consistent negative correlation between methylation levels at these CpG sites: cg03040489, cg04717045, cg04717045, cg03040489, cg05164185, cg12266049, cg09637363, cg26399164, cg00953256, cg18773844 and cg26399164, and CCND1 expression across various cancer types.