Immunotherapy: child suffering from cancer receiving infusion of lymphocytes doped with Interleukin-2 (IL-2). IL-2 is released naturally by certain key cells of the immune system (T- lymphocytes) after they have been activated by foreign antigens - of cancer cells, for instance. IL-2 amplifies the proliferation of other cell types, including lymphokine-activated killer (LAK) cells that attack cancer cells directly. Blood from a cancer victim is purified, the lymphocytes separated then doped with IL-2 (produced by genetic engineering) and cultured in vitro to boost the LAK cell population. The product is then re-injected into the patient. Photographed at Centre Lyon Berard, Lyon, France, 1988/89.

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