Association between CYP1A1 Ile462Val Polymorphism and Oral Squamous Cell Carcinoma Susceptibility: Evidence from 13 Investigations.

CYP1A1 Ile462Val polymorphism might play a key role in pathogenesis of oral squamous cell carcinoma (OSCC). Many case-control studies have investigated the association between CYP1A1 Ile462Val polymorphism and OSCC susceptibility. However, the conclusions are inconsistent. To aim a convincible conclusion, we carried out a meta-analysis to systematically evaluate the association of CYP1A1 Ile462Val polymorphism with OSCC susceptibility. We searched Pubmed, Web of Science, Ovid and Embase databases for available publications. The odds ratio (OR) with the corresponding 95% confidence interval (95% CI) was carried out to estimate the association. A total of 13 papers including 1468 cases and 2183 controls were included, a significant increased OSCC risk was observed in recessive model (OR=1.64, 95% CI=1.08-2.49), but not other genetic models. Our results suggest that the homozygous variant of CYP1A1 Ile462Val might be a risk factor of OSCC.

Xeroderma pigmentosum complementation group D (XPD) gene polymorphisms contribute to bladder cancer risk: a meta-analysis.

Numerous epidemiological studies have been conducted to investigate the association between Xeroderma pigmentosum complementation group D (XPD) Asp312Asn (rs1799793 G > A) and Lys751Gln (rs13181 A > C) polymorphisms and bladder cancer risk; however, the conclusions remain controversial. With this in mind, we performed this meta-analysis with 11 studies including 3,797 cases and 5,094 controls for Asp312Asn and 21 studies including 6,360 cases and 7,894 controls for Lys751Gln polymorphism. We searched available literatures from PubMed, Embase, and CBM databases. Crude odds ratios (ORs) and 95% confidence intervals (CIs) were calculated to assess the strength of the associations. Moreover, to validate biological plausibility of our findings, the effects of these two polymorphisms on XPD gene expression within three ethnicities was determine by gene expression analysis based on imputed genotypes from HapMap. Overall, the variant allele of Asp312Asn polymorphism was associated with an increased risk of bladder cancer (Asn/Asn vs. Asp/Asp: OR = 1.51, 95% CI = 1.19-1.91; Asp/Asn vs. Asp/Asp: OR = 1.23, 95% CI = 1.12-1.35; recessive model: OR = 1.33, 95% CI = 1.10-1.61; dominant model: OR = 1.32, 95% CI = 1.14-1.52; and allele comparing: OR = 1.26, 95% CI = 1.11-1.42). We found the Lys751Gln was associated with increased bladder cancer risk only under the recessive model (OR = 1.14, 95% CI = 1.01-1.29). Stratification analyses demonstrated an increased risk for Asians and hospital-based studies under all genetic models while only under the dominant model for Caucasians as to the Asp312Asn polymorphism and for Caucasians under the recessive model as to the Lys751Gln polymorphism. We also found the Asp312Asn polymorphism can significantly influence mRNA expression levels among Asians and Caucasians, and the Lys751Gln polymorphism has a similar effect for Caucasians. Despite some limitations, this meta-analysis suggests that polymorphisms in XPD gene may contribute to bladder cancer susceptibility. These findings need further validation by large well-designed prospective studies.

[Concurrent standard dose of cisplatin, paclitaxel, and radiotherapy followed by surgery in treatment of thoracic esophageal carcinoma].

OBJECTIVE: To investigate the curative effect of incorporation of the regimen of standard dose of paclitaxel combined with cisplatin into concurrent radiotherapy as pre-operative treatment for patients with esophageal carcinoma. METHODS: Twenty-six patients with primary diagnosis of esophageal carcinoma, 17 in stage II and 9 in stage III, underwent conventional fractionated radiotherapy with a total dosage of 40 Gy (2 Gy per day, 5 doses per week). Paclitaxel were given intravenously at a dose of 135 mg/m(2) for 3 h on day1 and day 22. Cisplatin was given intravenously at a dose of 20 mg/m(2) on D1-D3 and D22-24. 4 - 6 weeks after the completion of chemo-radiotherapy, left thoracic incision and transhiatal esophagectomy with anastomosis in the neck was performed. The patients were followed up for 42.28 months. Kaplan-Meier method was used to analyze the overall survival (OS) and disease-free survival (DFS), and Log-rank test was performed to assess the survival rates statistical significance among groups. RESULTS: The radical resection rate was 96.15%. The pathologic response to chemoradiotherapy were grade I in 9 patients, grade II in 6 patients, and grade III in 11 patients. The pathological complete remission (PCR) rate was 42.31% (11/26). Toxicity grade 3 - 4 included leucopenia (7.69%, 2/26), thrombocytopenia (7.69%, 2/26), and radiation esophagitis (11.54%, 3/26). Surgery-related complications included anastomotic leakage (3.85%, 1/26), recurrent laryngeal nerve injury (7.69%, 2/26), and chylothorax (3.85%, 1/26). The 3- and 5-year overall survival rates were 62.96% and 54.56% respectively. The 3- and 5-year disease-free survival rates were 59.94% and 55.65% respectively. The 3-year overall survival rates of the patients with different pathologic responses were 25.40% (for those of grade I), 60% (for grade II), and 90.91% (for grade III) respectively (P < 0.05). The 5-year overall survival rates were 0 (for grade I), 60% (for grade II), and 81.82% (for grade III) respectively (P < 0.05). CONCLUSION: Preoperative chemoradiotherapy containing full dose of paclitaxel and cisplatin increases the 5-year overall survival for the patients with postoperative pathologic response grade II and above, and does not increase the treatment-related complications.