Statistical Analysis
Overall survival was calculated as time in months between diagnosis and last follow-up or death. Patients were considered as lost to follow-up when they had failed to attend scheduled appointments for more than one year. Five-year overall survival rates were estimated using the Kaplan-Meier method with differences assessed using the log-rank test. Analyses were performed using SPSS version 25 (IBM, Somers, NY, USA). p values less than 0.05 were considered statistically significant.