The study is the first clinical trial performed in the United States to test the effects of this agent in PLD.
In addition to causing kidney failure, ADPKD also often leads to PLD, a condition characterized by multiple variably-sized cysts in the liver. Octreotide mimics the somatostatin hormone that regulates the secretion of several other hormones in the body. Somatostatin exerts its effects by blocking both the formation of the chemical cyclic AMP and the secretion of fluids by cells, two factors thought to play a role in the development of kidney and liver cystic diseases.
Marie Hogan, MD, PhD (Mayo Clinic College of Medicine) and her colleagues designed a clinical trial to examine whether Octreotide could shrink the cyst-filled livers of patients with PLD. The randomized, double blind, placebo-controlled trial enrolled 42 patients with severe PLD caused by ADPKD (34 patients) or autosomal dominant PLD (8 patients). (Autosomal dominant PLD is a genetic form of PLD not caused by ADPKD.)
Patients received Octreotide or placebo, and treatments were administered as monthly injections.
After one year, liver volume decreased by an average of approximately 5% in patients taking Octreotide but slightly increased (by approximately 1%) in patients taking placebo. Octreotide also had an effect on the diseased kidneys of patients with ADPKD.
Among these patients, total kidney volume remained practically unchanged in the Octreotide group but increased by more than 8% on average in the placebo group.
Kidney function was similar in both groups of patients. Octreotide was well tolerated, and treated individuals reported an improved perception of bodily pain and physical activity.
"In summary, Octreotide slowed the progressive increase in liver volume and total kidney volume, improved health perception among patients with PLD, and had an acceptable side effect profile," said Dr. Hogan.