Pri-miR-34b/c rs4938723 polymorphism contributes to acute lymphoblastic leukemia susceptibility in Chinese children.

A polymorphism rs4938723 (T > C) within the promoter region of pri-miR-34b/c has been found to not only affect the expression of mature miR-34b/c but also contribute to the susceptibility to several cancer types. We designed a case-control study to evaluate the role of rs4938723 in childhood acute lymphoblastic leukemia (ALL). The rs4938723 CC genotype was significantly associated with reduced ALL risk (p = 0.003, ORadjusted = 0.51, 95% CI = 0.33-0.80 for CC vs. TT). Stratification analyses showed the differences were pronounced in older (> 6 years), male subjects, as well as in patients in low risk and T-ALL subtypes. The in vitro luciferase assays in Jurkat and K-562 cell lines showed that the transcription activity of miR-34b/c was increased when T allele transited to C allele (p < 0.05). In conclusion, rs4938723 genetic variant contributed to the susceptibility to Chinese childhood ALL by influencing the transcription activity of miR-34b/c promoter.