Time frame: Day 1 (Group A retrospective data collection - 3 months before and up to 6/12 months after the last uncontrolled carcinoid episode. Group B retrospective data collection - up to 6/12 months before the date of enrolment)
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.