Factors Affecting Survival in Neuroendocrine Tumors: A 15-Year Single Center Experience

Background: Neuroendocrine tumors are a heterogeneous group of tumors that can originate from all of theneuroendocrine cells in the body, mostly from the gastrointestinal tract. In addition to early diagnosis, streamingpatients into appropriate prognostic groups is an important component of treatment. In this study, we examined thefactors that affect survival in patients we followed in our center between 2000-2016. Methods: The demographic data,clinical and pathological features of patients were obtained from their medical files. TNM staging and tumor gradingwere performed according to AJCC and WHO 2010 classification. SPSS 15.0 for Windows programme was used forstatistical analysis. Results: 85 patients (32 male, 53 female) were included into the study. The median age of the patientswas 55,7 (27-83) years. Eighty percent of the tumors were of gastroenteropancreatic system, most commonly stomach(27.1%) origin. Nineteen patients (22.4%) died during follow-up. In univariate analysis; age (p<0,001), stage (p=0.002),primary tumor localization (p=0.005), grade (p<0.001), Ki-67 value (p<0.001), number of metastases (p=0.001) andtype of surgery (p<0.001) were found to be factors affecting survival. Age (p=0.024) and Ki67 (p <0.001) were theindependent prognostic factors for survival in multivariate analysis. For the cut-off value of 6%, Ki-67 had a sensitivityof 83.3% and specifity of 71.4% for survival determination. Conclusion: Ki-67 ratio and age were the most importantfactors affecting survival in neuroendocrine tumors in our study. Ki-67 ratio has a high sensitivity and specificity forpredicting survival, a cut-off value of 6% may be used to predict survival.