Clinical and Pathological Features of Non-Functional Neuroendocrine Tumors of Pancreas: A Report from Iran

BACKGROUND Pancreatic neuroendocrine tumors (PNETs) are rare tumors with variable malignant potential, prognosis, and survival. We aimed to assess the characteristics of patients with non- functional PNET in our hospital. METHODS From Nov 2010 to Nov 2013 , all patients who came to endosonography unit of Shariati hospital , Tehran , Iran , and had pancreatic lesions were assessed . Tumor samples were obtained through fine needle aspiration. Various characteristics of the non- functional PNET were recorded and patients were followed up to three years. RESULTS Twenty eight non func-PNET cases, aged 37-72 years were identified, 15 (53.6%) of whom were men. Fifteen (53.6%) tumors were located in the head and 5(17.8%) in the body of the pancreas. The mean tumor size was 3.9 Cm and 10.7% , 28.6%, 32.1%, and 28.6% of the patients were at stages I, II, III and IV, respectively. Of the patients, 12 (43%) underwent surgery, 3 (10.7%) received chemotherapy, and 13 (46.4%) received no treatment. During the mean follow-up of 16 months, the disease had progressed in 3 (10.7%) patients and 10 (35.7%) had died. In univariate analysis, tumor size>3Cm and Ki-67>20% were correlated with survival rate but not in multivariate analysis. CONCLUSION Iranian patients with non- functional PNET present similar characteristics to world patients. There is a need to establish efficacy of tumor samples which are obtaining through fine needle aspiration for assessing tumor grading.