Statistical analyses
The evaluation of the results was made using the SPSS Version.22.0 program. Variables in the study were evaluated in terms of normal distribution using the One-Sample Kolmogorov-Smirnov test. Data which are in compliance with the normal distribution were given with arithmetic mean and standard deviations, and data which are not in compliance with the normal distribution were given with median values (25% -75% percent). Chi-square and Fisher tests were used for comparison of categorical data. Non-parametric Mann Whitney test was used to evaluate ordinal data. Kaplan-Meier method and Log-rank test were used to calculate progression-free survival and overall survival times. Progression-free survival time was accepted as the time from diagnosis to progression, and total survival time from the date of diagnosis to the date of patient death or the termination of follow-up period. P<0.05 values were considered statistically significant.