CCND1 and colorectal carcinoma: Subgroup analysis by study design indicated that significant association between the CCND1 G870A polymorphism and the risk of CRC was only observed in HB studies (AA + AG vs GG: OR = 1.30, 95% CI = 1.14–1.47), rather than PB (OR = 1.16, 95% CI = 1.00–1.35) or FB studies (OR = 0.92, 95% CI = 0.38–2.23).