CCND1 and nasopharyngeal carcinoma: Overall, the combined results indicated that CCND1 G870A polymorphism was not significantly associated with NPC risk in all genetic models (for the allele model A vs. G: OR = 0.84, 95% CI 0.62–1.15, p = 0.28; for the co-dominant model AA vs. GG: OR = 0.72, 95% CI 0.37–1.43, p = 0.35; for the dominant model AA/AG vs. GG: OR = 0.75, 95% CI 0.43–1.30, p = 0.30; for the recessive model AA vs. AG/GG: OR = 0.86, 95% CI 0.56–1.30, p = 0.47, Fig. 1).