Skip to main content main menu top menu asco conquer cancer foundation journal of clinical oncology journal of oncology practice asco university oncologist-approved cancer information from the american society of clinical oncology search form sitemap search home cancer types carcinoid tumor carcinoid tumor this section has been reviewed and approved by the cancer. viagra or viagra Net editorial board, 4/2011 overview cancer. can i buy viagra online legally Net guidecarcinoid tumor overview statistics medical illustrations risk factors symptoms and signs diagnosis staging treatment about clinical trials side effects after treatment current research questions to ask the doctor patient information resources about the endocrine system and endocrine tumors the endocrine system consists of cells that produce hormones. viagra cost Hormones are chemical substances that are formed in the body and carried in the bloodstream to have a specific regulatory effect on the activity of other organs or cells in the body. Part of the endocrine system is the neuroendocrine system, which is made up of cells that are a cross between traditional hormone-producing cells and nerve cells. A tumor begins when normal cells change and grow uncontrollably, forming a mass. A tumor can be benign or malignant. A benign tumor is not cancerous and usually can be removed without it causing much harm. generic viagra online A malignant tumor is cancerous and can be harmful if not found early and treated. viagra generic It can spread to and damage the body's healthy tissues and organs. lilly viagra to buy An endocrine tumor is a growth that affects the parts of the body that secrete hormones. Because an endocrine tumor arises from cells that produce hormones, the tumor itself can produce hormones and cause serious illness. viagra and the refractory period About carcinoid tumors a carcinoid tumor starts in the hormone-producing cells of various organs, mostly the gastrointestinal tract (such as the stomach and intestines) and lungs, but it can also start in the pancreas, testicles (in males), or ovaries (in females). buy generic viagra More than one carcinoid tumor can occur within the same organ. The cause of a carcinoid tumor is unknown. A carcinoid tumor is a type of neuroendocrine tumor, which means it starts in cells of the neuroendocrine system that make hormones. A carcinoid tumor can make high levels of neuropeptides and amines (hormone-like substances); however, they may not be released in large enough amounts to cause symptoms, or they may be defective and not cause symptoms. buy viagra A carcinoid tumor can grow slowly for many years without causing symptoms. Although a carcinoid tumor is cancerous, it is often referred to as "cancer in slow motion. lilly viagra to buy " here is a general overview of where carcinoid tumors begin: 39% occur in the small intestine. 1.