Association between XRCC1 Arg399Gln polymorphism and glioma risk in a Chinese population: a case-control study.

AIM: In China, the incidence rates of glioma tend to be increased, however, the genetic contribution to its etiology is not well-understood. The aim of this study is to evaluate the association of XRCC1 Arg399Gln polymorphism with glioma risk in a Chinese population. MATERIALS AND METHODS: We conducted a case-control study on 387 patients with glioma and 400 cancer-free controls between 2004 and 2014. Peripheral blood samples of both groups were processed for DNA extraction and genotyping of the XRCC1 Arg399Gln polymorphism using PCR-RFLP. Comparison of the distribution of Arg399Gln genotypes in the study groups was performed by means of 2-sided contingency tables using the χ(2) test. Hazard ratios (HRs) were estimated by Cox proportional hazard regression model. RESULTS: When the AA genotype was used as the reference group, the GG genotype was associated with significantly increased risk for glioma (adjusted OR = 3.18, 95% CI = 1.38-3.88; P = 0.017). Under the dominant model of inheritance, the AG + GG genotype was associated with significantly increased risk for glioma (adjusted OR =2.33, 95% CI = 1.12-5.81; P = 0.023). When the A allele was used as the reference group, the G allele was associated with increased glioma risk (adjusted OR, 2.44, 95% CI, 1.76-4.18; P = 0.003). CONCLUSION: Our data suggests that XRCC1 Arg399Gln polymorphism contribute to increased risk of glioma, which may be susceptibility biomarkers for glioma.

Neuronavigator-guided percutaneous radiofrequency thermocoagulation in the treatment of intractable trigeminal neuralgia.

BACKGROUND: Percutaneous radiofrequency thermocoagulation of the trigeminal ganglion (PRTTG) is regarded as the first choice for most patients with trigeminal neuralgia (TN) because of its safety and feasibility. However, neuronavigator-guided PRTTG has been seldom reported. The purpose of this study was to assess the safety and efficacy of neuronavigator-guided PRTTG for the treatment of intractable TN. METHODS: Between January 2000 and December 2004, 54 patients with intractable TN were enrolled into this study and were randomly divided into two groups. The patients in navigation group (n = 26) underwent PRTTG with frameless neuronavigation, and those in control group (n = 28) received PRTTG without neuronavigation. Three months after the operation, the efficacy, side effects, and complications of the surgery were recorded. The patients in the control group were followed up for 10 to 54 months (mean, 34 +/- 5), and those in the navigation group were followed up for 13 to 58 months (mean, 36 +/- 7). Kaplan-Meier analyses of the pain-free survival curves were used for the censored survival data, and the log-rank test was used to compare survival curves of the two groups. RESULTS: The immediate complete pain-relief rate of the navigation group was 100%, whereas it was 95% in the control. The proportion of sustained pain-relief rates at 12, 24 and 36 months after the procedure were 85%, 77%, and 62% in the navigation group, and 54%, 40%, and 35% in the control. Recurrences in the control group were more common than that in the navigation group. Annual recurrence rate in the first and second years were 15% and 23% in the navigation group, and 46%, 60% in the control group. No side-effect and complication was noted in the navigation group except minimal facial hypesthesia. CONCLUSION: Neuronavigator-guided PRTTG is a safe and promising method for treatment of intractable TN with better short- and long-term outcomes and lower complication rate than PRTTG without neuronavigation.

[Microsurgical treatment of trigeminal neurinomas with middle fossa extradural approach].

OBJECTIVE: To investigate the effect of microsurgical treatment of trigeminal neurinomas with middle fossa extradural approach. METHODS: Between January 1996 and December 2005, 27 patients with trigeminal schwannomas were treated by middle fossa extradural approach. The clinical data were retrospectively analyzed. RESULTS: Total resection was achieved in 25 patients and subtotal resection in the other 2 patients. The cranial nerve deficits were improved in 18 patients, unchanged in 4 patients and worsened in 5 patients postoperatively. New Incomplete paralysis of cranial nerve were observed in 4 patients. Cerebrospinal fluid leakages and bacterial meningitis occurred in 2 cases, which were cured by lumber draining and antibiotic therapy. There was not operative mortality. Twenty six patients were followed up for 6 - 48 months. Tumor recurrence was found in 1 case after 40 months and was excised again. CONCLUSION: This approach can provide better exposure of these tumors and multiple working angles with minimal brain retraction and can improve the surgical results in terms of increased complete tumor resection rate and reduced complications rate.