Word: herited
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Dates: during 1930-1939
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Investigators have at last got a glimmering of what causes cancer. Some people in herit a susceptibility to the disease. But they do not develop cancer unless some susceptible part of the body is unduly irritated by: 1) carcinogenic chemicals, 2) physical agents (X-rays, strong sun light, repeated abrasions as from a jagged tooth), 3) possibly, biological products produced by parasites. Carcinogenic chemicals occur in coal tar, bile acids, female sex hormone. However, no one under stands the exact way in which any of these causes cancer in those individuals who are susceptible to cancer...
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