Your condition can be frustrating, unpredictable and depressing. But you can take action! Record your experiences, feelings, your treatment regimen, and your body's reaction. This volume consists of 150 plain college-ruled pages. A carcinoid tumour is a rare cancer of the neuroendocrine system - the body system that produces hormones.The tumour usually grows in the bowels or appendix, but it can also be found in the stomach, pancreas, lung, breast, kidney, ovaries or testicles. It tends to grow very slowly.