KAPOSI'S SARCOMA: 1. A previously uncommon form of cancer that attacks the connective tissue, bones, cartilage and muscles of the body. The cancer may spread and also attack the eyes. If the cancerous area is near the surface of the skin, lesions inches in length may develop. This disease was initially seen only in elderly men and natives of Central Africa. Experimental work has shown that the AIDS-related Kaposi's sarcoma and the Central African variety respond differently to some types of medications. Radiotherapy and chemotherapy are usually recommended. 2. A type of cancer characterized by abnormal growths of blood vessels that develop into purplish or brown lesions. It is suspected that the cause of Kaposi's sarcoma is a newly found herpes virus.

KILLER T CELLS: Killer cells infected with HIV or other viruses or transformed by cancer. Also known as cytotoxic T cells (or cytotoxic T lymphocytes). See also Null Cell; T Cells.