Determining Related Factors to Survival of Colorectal Cancer Patients Using Cox Regression

Colorectal cancer (CRC) is the third common cancer worldwide and its death rate is increasing in Iran. The present study is conducted with the purpose of determining related factors to CRC patients’ survival using Cox regression model. In a historical cohort, we examined 404 subjects who were diagnosed with CRC and referred to Omid Hospital in Mashhad from 2006 through 2011. First demographic and clinical information of patients were gathered and then were followed until September 2016. In this paper, Cox regression was utilized to investigate related factors to CRC patients’ survival. For statistical analysis SPSS software was applied and significant level was 0.05. In this research, 217 men (53.7%) and 187 women (46.3%) were studied. The mean±sd of subjects’ age was 56.4±14.7 years and 3- year, 5-year and 7-year survival rates of patients were 0.60, 0.50 and 0.48 respectively. In this study, the median (95% confidence interval) of survival times was calculated 5.48 (3.07, 7.90). According to Cox regression model, BMI (p=0.024), first treatment (p=0.019), stage (p