Statistical Considerations
EVENTS
Based on the PFS of 6 months in sunitinib phase III study,All statistical analyses used the SPSS 19.0 platform. PFS and OS curves were constructed according to the Kaplan–Meier method and were compared using a log-rank test. Frequency and percentage descriptions were used for categorical variables and chi-squared test was conducted to compare the incidence of different events. If the theoretical frequency was lower than 1, Fisher’s exact test was conducted.