Genetic polymorphism of CCND1 G870A and esophageal cancer susceptibility: A meta-analysis

Lack of association between cyclin D1 A870G (rs9344) polymorphism and esophageal squamous cell carcinoma risk: case-control study and meta-analysis

Studies examining the association between the cyclin D1 (CCND1) A870G (rs9344 G>A) polymorphism and esophageal squamous cell carcinoma (ESCC) have yielded inconsistent results. Here, we conducted a hospital-based case-control study in a Chinese Han population to assess the association between the CCND1 A870G polymorphism and ESCC. We then performed a meta-analysis to further investigate this association. We recruited 629 patients with ESCC and 686 cancer-free controls. Genotyping was performed with the polymerase chain reaction-ligase detection reactions (PCR-LDR) method. The meta-analysis was performed with the STATA 12.0 software. The case-control study showed no significant difference between the ESCC cases and controls in the allele frequencies or genotype distributions of the CCND1 A870G polymorphism. To obtain a more precise estimate of this relationship, we performed a meta-analysis of seven case-control studies involving a total of 2080 ESCC cases and 2833 controls. The meta-analysis suggested that the CCND1 A870G polymorphism is not associated with a risk of ESCC. A further subgroup analysis based on ethnicity also detected no association. This study suggests that the CCND1 A870G polymorphism is not associated with the risk of ESCC.

Effect of the CCND1 A870G polymorphism on prostate cancer risk: a meta-analysis of 3,820 cases and 3,825 controls

Background

Cyclin D1 (CCND1) is critical in the transition of the cell cycle from the G1 to S phases, and unbalanced cell cycle regulation is a hallmark of carcinogenesis. Numerous epidemiological studies have evaluated the association between the CCND1 A870G polymorphism and the risk of prostate cancer (PCa). However, these studies have yielded conflicting results.

Methods

In the present study, the possible association above was assessed by a meta-analysis. Eligible articles were identified for the period up to July 2014. Pooled odds ratios (ORs) with 95% confidence intervals (95% CI) were appropriately derived from fixed effects or random effects models.

Results

A total of ten case-control studies, which included 3,820 cases and 3,825 controls, were identified. Overall, the allelic/genotypic association between the G870A polymorphism and prostate cancer was nonsignificant (OR = 1.045, 95% CI = 0.947 to 1.153 for A versus G, P = 0.380; OR = 1.088, 95% CI = 0.896 to 1.321 for AA versus GG, P = 0.393; OR = 1.044, 95% CI = 0.941 to 1.158 for GA versus GG, P = 0.414; OR = 1.053, 95% CI = 0.955 to 1.161 for the dominant model AA + GA versus GG, P = 0.303; OR = 1.072, 95% CI = 0.881 to 1.306 for the recessive model AA versus AA + GA, P = 0.486). Moreover, subgroup analyses according to ethnicity failed to demonstrate a significant association between this polymorphism and prostate cancer. In addition, we also performed a stratified analysis of cases with PCa metastasis, and the results supported the findings of no significant association between CCND1 A870G polymorphism and metastasis risk of PCa.

Conclusions

Our results suggest that the CCND1 A870G polymorphism might not be a potential candidate for predicting prostate cancer risk, including metastasis risk.

The determination of genetic markers of age-related cancer pathologies in populations from Kazakhstan

Aging associates with a variety of pathological conditions such as cancer, cardiovascular, neurodegenerative, autoimmune diseases, and metabolic disorders. The oncogenic alterations overlap frequently with the genes linked to aging. Here, we show that several aging related genes may serve as the genetic risk factors for cervical and esophagus cancers. In our study, we analyzed samples obtained from 115 patients with esophageal and 207 patients with cervical cancer. The control groups were selected to match the ethnicity and age of cancer patients. We examined the genes involved in the processes of xenobiotics detoxification (GSTM1 and GSTT1), DNA repair (XRCC1 and XRCC3), and cell cycle regulation and apoptosis (CCND1 and TP53). Our study revealed that deletions of GSTT1 and GSTM1 genes or the distinct point mutations of XRCC1 gene are associated with cervical and esophageal cancers. These results will lead to development of screening for detection of individuals susceptible to esophageal and cervical cancers. Introduction of the screening programs will allow the early and effective preventive measures that will reduce cancer incidence and mortality in Kazakhstan.