NET cancers are difficult to diagnose. After the onset of symptoms, which are often nonspecific and vague, a diagnosis can take an average of 3 – 7 years. If NET cancers are detected early in their development, they can often be cured with surgery. At present, however, most NET cancers are diagnosed at a later stage, when they have already spread to other parts of the body. In these cases, they can rarely be cured, although the symptoms can often be managed successfully for a number of years.