Long-term (up to 3 years) clinical and hormonal outcomes in acromegalic patients with treated surgery with or without long acting somatostatin analogues.

Patients who are diagnosed with acromegaly with a GH-secreting pituitary adenoma receiving TSA at the Asan Medical Center (Seoul, Korea) from Aug 2013 to Aug 2015 will be recruited.

The eligible patient population will consist of 30 adult, male and female patient with Age 18 or older.

• Number of patients by treatment group: Surgical treatment only = 15, Surgery with medical treatment = 15
• Number of Centers: 1 (single center)

Inclusion Criteria:

1. Age 18 or older.
2. Patients diagnosed with acromegaly with GH-secreting pituitary adenoma on sellar MRI, meeting the biochemical criteria outlined above (refer to 1. Diagnosis of acromegaly) and with typical acromegalic features.
3. No prior use of somatostatin analogues.
4. Adequate hepatic and renal function
5. Provision of a signed written informed consent

Exclusion Criteria:

1. Severe co-morbid illness such as untreatable other malignancy and/or active infections.
2. Pregnant or lactating women
3. Hypersensitivity to Sandostatin or any component of the formulation.