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The Origin of Cancer

“An understanding of the mechanism that controls growth and differentiation in normal cells would seem to be an essential requirement to elucidate the origin and reversibility of malignancy. For this approach I have mainly used normal and leukemic blood cells, and in most studies have used myeloid blood cells as a model system. Our development of systems for the in vitro cloning and clonal differentiation of normal blood cells made it possible to study the controls that regulate growth (multiplication) and differentiation of these normal cells and the changes in these controls in leukemia. Experiments with normal blood cell precursors have shown that normal cells require different proteins to induce growth and differentiation. We have also shown that in normal myeloid precursors, growth-inducing protein induces both growth and production of differentiation-inducing protein so this