A NET that releases hormones and may cause many different symptoms. Also called a secretory NET.
A system of classifying tumor cells. The cells are graded based on how they look under a microscope and how quickly the tumor is likely to grow and spread. Low-grade tumors (grades 1 and 2) look like the tissue around them. They are less aggressive. High-grade tumors (grades 3 and 4) do not look like the tissue around them. They are more aggressive.