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Immune system is the body's complex mechanism, made up of organs and millions of individual cells, for fighting infection, illness, and harmful foreign substances.

Immunohistochemistry (IHC) is a diagnostic test that identifies cancer cell types using color-stained antibodies. Knowing cell type can help doctors identify the origin of the cancer.

Immunologist is a medical doctor who specializes in treating disorders of the immune system.

Immunotherapy is a conventional therapy that stimulates your immune system and improves your body's natural cancer detection and response mechanisms.

Informed consent is an agreement you must sign before participating in a clinical trial. It discloses important information about the study such as the costs and possible side effects of the treatment being tested.

Integrative medicine draws on a wide variety of complementary healing traditions to support and enhance conventional cancer treatment. Practitioners of integrative medicine work collaboratively with other healthcare providers and patients to design a treatment plan that addresses all aspects of well-being, including physical, emotional, and spiritual needs.

Intensity modulated radiation therapy (IMRT) uses advanced computer imaging to deliver a powerful and precise dose of external radiation to the precise contours of the tumor. Because IMRT minimizes the exposure of healthy tissue to radiation, doctors can use higher doses than they can with traditional external radiotherapy.

Interferons are immune system proteins that inhibit the division and growth of cancer cells. While the body naturally produces interferons when it's exposed to a bacteria, virus or other foreign invader, they're also created in the laboratory for use in immunotherapy.

Interleukins are hormone-like substances in the immune system that stimulate the growth of white blood cells to fight cancer and other diseases. Though naturally produced by the body, they are also created in the laboratory for use in immunotherapy.

Interventional radiology is minimally invasive surgery (MIS) using imaging techniques, such as X-ray, CT scan, MRI, or ultrasound to deliver treatments including chemotherapy, radiation therapy, and heat or cold therapy, directly to the tumor through a tiny incision. Interventional radiology is also used to take biopsies, and to place catheters and intravenous devices, among other uses.

Intra-arterial chemotherapy is the delivery of anti-cancer drugs directly to the site of a tumor through a nearby artery. Intraoperative radiation therapy is the delivery of radiation directly to a tumor that's exposed during surgery.

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