Spss statistics for windows version 12

Characteristic differences between the groups were compared using the independent t-test, Pearson`s chi-square test, or Fisher`s exact test. Survival curves were obtained using the Kaplan-Meier method, and were compared using the log rank test. Multivariate analyses were conducted using Cox`s proportional hazards model to assess the prognostic significance of adjuvant chemotherapy, and hazard ratios (HRs) and 95% confidence intervals (95% CIs) were estimated for each variable. Multivariate models were adjusted for age at diagnosis, surgery type, number of harvested lymph nodes, lymphatic invasion, vascular invasion, histologic grade, radiotherapy, and chemotherapy. All statistical tests were two-sided, and the statistical significance was set at P<0.05. All statistical analyses were performed using SPSS Statistics for windows, Version 12.0 (SPSS Inc., Chicago, IL, USA).

All data are presented as the mean ± SD obtained from three individual experiments. The statistical analysis was done using the SPSS Statistics for Windows, Version 12.0 (SPSS Inc, SPSS Inc., Chicago, IL, USA). The different mean values were analyzed using the independent samples t-test and one-way analysis of variance (ANOVA). The Duncan Multiple Range Test (DMRT) was applied for mean comparisons. The significant differences were considered at p ≤ 0.05 (95% significance interval). Pearson’s bivariate correlation was used to determine the correlation coefficient (r).