Ibritumomab tiuxetan: An anticancer drug that is a combination of a monoclonal antibody and a radioisotope (yttrium-90). Also called IDEC-Y2B8 monoclonal antibody.

ICI 182780: A drug that blocks estrogen activity in the body and is used in the therapy of estrogen-dependent tumors such as breast cancer.

Idarubicin: An anticancer drug that belongs to the family of drugs called antitumor antibiotics. Also called 4-demethoxydaunorubicin.

IDEC-In2B8: A radio labelled antibody being that is being studied in cancer treatment.

IDEC-Y2B8 monoclonal antibody: An anticancer drug that is a combination of a mono a monoclonal antibody and a radioisotope (yttrium-90). Also called ibritumomab tiuxetan. Monoclonal antibodies are laboratory-produced substances that can locate and bind to cancer cells.

Idiopathic: Describes a disease of unknown cause.

Idiopathic myelofibrosis: A progressive disease in which the bone marrow is replaced by fibrous tissue and is unable to produce red blood cells; the cause is unknown.

Idoxifene: A drug that blocks the effects of estrogen.

Idoxuridine: A drug that reduces the risk of cancer cell growth by interfering with the cells' DNA.

Ifosfamide: An anticancer drug that belongs to the family of drugs called alkylating agents.

Ileostomy (il-ee-AHS-toe-mee): An opening into the ileum, part of the small intestine, from the outside of the body. An ileostomy provides a new path for waste material to leave the body after part of the intestine has been removed.

ILX-295501: A substance that is being studied as an anticancer drug. It belongs to the family of drugs called diarysulfonylureas.

ILX23-7553: A substance that is being studied as an anticancer drug.

IM-862: An anticancer drug that belongs to the family of drugs called angiogenesis inhibitors.

Imagery: A technique in which the person focuses on positive images in his or her mind.

Imaging: Tests that produce pictures of areas inside the body.

Imaging procedures: Methods of producing pictures of areas inside the body.

Imipenem: An antibiotic drug used to treat severe or very resistant infection. It belongs to the family of drugs called carbapenems.

Immune adjuvant: A drug that stimulates the immune system to respond to disease.

Immune function: Production and action of cells that fight disease or infection.

Immune response: The activity of the immune system against foreign substances (antigens).

Immune system (im-YOON): The complex group of organs and cells that defends the body against infection or disease.

Immunocompromised: Having a weakened immune system caused by certain diseases or treatments.

Immunodeficiency: The decreased ability of the body to fight infection and disease.

Immunodeficiency syndrome: The inability of the body to produce an immune response.

Immunoglobulin: A protein that acts as an antibody.

Immunological adjuvant: A substance used to help boost the immune response to nse to a vaccine so that less vaccine is needed.