The tumor that is developed in cells in the neuroendocrine system formed by nervous cells is called cells that produce Neuroendocrine Tumor (NET) hormones. The number of NET group cancers, which are classified according to the organs or tissues they receive, is quite high compared to other cancers. Faculty Member of the University of Hacettepe Cancer Institute Dr. Şuayib Yalçın said: "There is no other type of cancer that has little work on it." According to data in the world, 5-7 out of 100 thousand people are diagnosed with NET each year. With a rough estimate of neuroendocrine tumors than 5600 people estimated the year in Turkey that it had caught.