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AIDS, Kaposi sarcoma, and the lymphatic system: update and reflections.

Based on ongoing basic and clinical investigations, further evidence is presented that the AIDS-Kaposi sarcoma (AIDS-KS) complex involves a progressive disturbance of the blood-lymph circulatory loop of fluid, macromolecules, and migrating cells. We first surveyed the spectrum of vascular abnormalities including Kaposi sarcoma (KS) found in the AIDS/ARC population, then non-invasively imaged lymphatic system abnormalities in AIDS-KS by whole body lymphangioscintigraphy, and finally examined the biologic behavior of AIDS-KS cells in long-term tissue culture. These observations are viewed in terms of the lymphatic and blood vascular route of entry and transport of free and cell-associated virus and other opportunistic pathogens as well as poorly understood host endothelial-immune system interactions.