Hepatocellular carcinoma (HCC) is a complex polygenic disease whose development is dependent on many genetic factors. The let-7 family, an important and widely studied microRNA family, has been shown to play an important role in the initiation and progression of HCC. In this study, we examined the possible associations between single-nucleotide polymorphisms in the promoter region of the let-7 family (rs10877887) and the susceptibility and prognosis of HCC, using a case-control research model.
Breast cancer (BC) is a common malignancy affecting women, with increasing incidences of this disease in China every year. Recent studies have extensively investigated a single nucleotide polymorphism in the let-7 miRNA binding site of the 3'-untranslated region of KRAS mRNA. The aim of this study was to determine the genotype frequency of the KRAS rs712 polymorphism, and evaluate its effect on BC risk. This hospital-based case-control study comprised 228 patients with histologically confirmed BC and 251 healthy controls.