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Objective response
An improvement that can be measured by the health care provider (for example, a decrease in pain can be measured by how much pain medicine the patient is taking).
Observation
Closely monitoring a patient's condition but withholding treatment until symptoms appear or change. Also called watchful waiting, (Wait and see approach).
Obstruction
Blockage of a passageway.
Octreotide scan / Somatostatin receptor scintigraphy.(SRS)
A type of radionuclide scan used to find carcinoid and other types of tumors. Radioactive octreotide, a drug similar to somatostatin, is injected into a vein and travels through the bloodstream. The radioactive octreotide attaches to tumor cells that have receptors for somatostatin. A radiation-measuring device detects the radioactive octreotide, and makes pictures showing where the tumor cells are in the body. This procedure is also called somatostatin receptor scintigraphy (SRS).
Octreotide/Somatostatin analogues
Synthetic somatostatin derivative that inhibits many hormones produced naturally and in excess by different neuroendocrine tumors (serotonin, growth hormone, gastrin, VIP, glucagon, secretin, insulin, cholecystokinin and others). Examples of octreotide and other somatostatin analogues are  Sandostatin s.c. ®, and Sandostatin LAR® manufactured by Novartis), lanreotide - trade name - Somatuline, ® Autogel®, manufactured by Ipsen, vapreotide - trade name - Sanvar(R) manufactured by H3 Pharma.
Omega-3 fatty acid
Omega-3 fatty acids are a form of polyunsaturated fats, one of four basic types of fat that the body derives from food.Omega-3s are termed essential fatty acids (EFAs) because they are critical for good health. However, the body cannot make them on its own. For this reason, omega-3s must be obtained from food, thus making outside sources of these fats "essential and may reduce the risk the heart disease, improve symptoms of rheumatoid arthritis and be useful in the prevention and treatment of many other diseases. Good food sources are found in certain fish tissues, and in vegetable sources such as flax seeds, walnuts, and canola oil.
Oncologist
A doctor who specializes in oncology.
Oncology
The study and treatment of cancer. Doctors who specialize in oncology are called oncologists.
Ostomy
An operation to create an opening (a stoma) from an area inside the body to the outside. Colostomy and urostomy are types of ostomies.
Oxaliplatin (brand name Eloxatin®)
An anticancer drug that belongs to the family of drugs called platinum compounds.Oxaliplatin (OX-ah-lee-PLA-tin) belongs to the group of medicines called antineoplastics. It is used to treat cancer of the colon or rectum. Oxaliplatin is usually given along with other medicines to treat cancer.