Patients who have had at least one episode of uncontrolled CS, according to medical criteria, since the start of their treatment for NET.

Patients who have not had any episode of uncontrolled CS, according to medical criteria, in the last 12 months.

The study consists of a single visit in which socio-demographic and clinical variables will be collected from the medical record or directly from the patient. In addition, the physician will provide information on the clinical status of the disease and the patient will fill in the questionnaire.

A descriptive analysis of the diagnostic process; time of evolution of the disease; treatment prescribed following the diagnosis of NET and reason for choice; time elapsed from the diagnosis of NET to the first therapeutic intervention; prior and current drug treatment for NET and CS (active substance, type of treatment [rapid action vs prolonged action], dose and duration); concomitant diseases (including cardiac complications); New York Heart Association (NYHA) functional classification (I-IV); proBNP, chromogranin A and 5HIAA value; and value of the last echocardiogram, as well as any other treatments and interventions that the patient may have undergone (Yes/No, active substance and type of intervention) will be performed. The results will be compared between the two groups of patients using the paired t test for continuous variables and the Cochran-Mantel-Haenszel test or conditional logistic regression for categorical variables.