To be eligible for entry in this study, patient must:

• Be greater than or equal to 18 years of age.

• Have a confirmed diagnosis of acromegaly based on the following criteria:

  1. Typical clinical features and
  2. Mean GH concentration > 1.0 ng/mL following an oral glucose tolerance test (OGTT) and
  3. Elevated serum IGF-1 levels above gender- and age- matched values.

• Fall into one of the following categories:

  1. Has been treated for at least the last 12 weeks with Sandostatin LAR® 10 mg or 20 mg, every 28 days with well-controlled symptoms of acromegaly and GH concentration < 2.5 ng/mL at screening or
  2. Be naïve to prolonged release octreotide with a demonstrated tolerance response to a 7-day administration of Sandostatin® immediate release (50 µg s.c. t.i.d.) or
  3. If previously treated with prolonged release octreotide, has stopped such treatment for at least 12 weeks prior to screening.
• If female and of childbearing potential, must have a negative pregnancy test at screening and be using adequate means of birth control (i.e., oral or trans-dermal contraceptive drugs, intra-uterine device, diaphragm) during the study.
• Have the ability to understand the requirements of the study, provide written informed consent to participate in this study and agree to abide by the study restrictions.

Exclusion Criteria

To be eligible for entry in this study, patient must NOT:

• If female, be pregnant or lactating.
• Have been treated with a GH receptor antagonist (pegvisomant) within the last 12 weeks.
• Have used a dopamine agonist within the last 30 days.
• Have undergone pituitary surgery within the last 12 weeks.
• Have undergone radiotherapy within the last two years.
• Have any contraindication (hypersensitivity to octreotide formulation) or non-responders to Sandostatin-LAR® treatment.
• Be currently treated with Sandostatin-LAR® and have symptoms of acromegaly that would justify, in the Investigator's opinion, a dose modification.
• Be receiving Sandostatin-LAR® administration every < 21 or > 35 days.
• Have a liver disease such as cirrhosis, chronic active hepatitis or chronic persistent hepatitis, or has persistent ALT, AST > 2 X ULN, serum creatinine > 2 X ULN, serum bilirubin > 2 X ULN.
• Have any other conditions that could result in altered GH or IGF-1 levels (such as anorexia nervosa, Laron's syndrome, treatment with levodopa or narcotics analgesics, heroin abuse.)
• Have type I diabetes (insulin-dependent) or uncontrolled type II diabetes (non-insulin-dependent) as indicated by the presence of ketoacidosis or HbA1C greater than or equal to 10%.
• Have clinically significant signs and symptoms potentially related to a tumor compression of the optical chiasm, based on judgment of the investigator.
• Have symptomatic cholelithiasis.
• Have received an investigational drug or participated in a clinical trial within the last 30 days.
• Have clinically serious and/or unstable intercurrent infection, medical illnesses or conditions that are uncontrolled or whose control, in the opinion of the Investigator, may be jeopardized by participation in this study or by the complications of this therapy.