Digestive neuroendocrine tumors: reclassifying of 26 cases according to 2010 who classification.

BACKGROUND:The classification of digestive neuroendocrine tumors is difficult due to their heterogeneity and rareness. AIMS:Reclassify the digestive neuroendocrine tumors according  to  the  WHO-2010 classification .  Methods: A retrospective study included   26 patients having digestive neuroendocrine     tumors ,  is achieved  in our  Pathology  Laboratory  of the Military Hospital of  Tunis between 2000 and 2013. RESULTS:The mean age of patients was 49.64 years. The Sex ratio was  1.36. It was 6 gastric tumors, 5 small intestine tumors , 5 pancreatic tumors, 5  appendix tumors , one hypatic tumor, one  gall bladder  tumor , one rectal tumor and one colon tumor. According to the WHO -2000 classification, tumors are categorised into 11 well differentiated  endocrine tumors, 13 well differentiated  endocrine carcinoma  and 2 poorly differentiated carcinoma . According to the WHO -2010 classification, tumors were re-evaluated as  16 neuroendocrine tumors grade 1, 6 neuroendocrine tumors grade 2 and 4 neuroendocrine carcinoma . CONCLUSION:There was a concordance between the two classifications in 93% of cases. The WHO -2010 classification may allow a  better classification for the digestive neuroendocrine tumors, however there are some histological categories that remained difficult to classify.