CCND2 and acute lymphoblastic leukemia: To detect the potential impact of CCND2 polymorphisms on the risk of developing childhood ALL in a Chinese population, we selected a tagging single nucleotide polymorphism (tSNP) rs3217927 from the data for Chinese in the HapMap database (http://hapmap.ncbi.nlm.nih.gov/), which locates in the 3′ untranslated region (UTR) of CCND2. We then genotyped this SNP in 753 patients with childhood ALL and 1088 normal controls in this case control study.