John Beard wrote in 1902 that cancer cells resembled trophoblastic embryonic cells. At the beginning of pregnancy, these cells made sure that the embryo can implant in the uterus. The growth is aggressive and chaotic. The cells divided quickly and gain ascendancy their energy from sugar fermentation. They suppressed the immune system of the mother and produced human chorionic gonadotropin (hCG), which is now recognized as a tumor marker. The growth stops when the embryo from the seventh week, pancreatic enzymes produced. Without these enzymes would give the most malignant tumor, the choriocarcinoma. The assumption that cancer tumors would gain energy from the sugar fermentation (ie, the tumor would live anaerobic) was the basis for many outdated treatments.
In 1908, Ellerman and Bang discovered a virus that caused leukemia in chickens. Peyton Rous
it was then, in 1911 from a muscle tumor with the high filter fineness 120 nanometers an extract filtered, with whom he was able to cause cancer. He suspected a virus in this extract. 1966 Rous was awarded for the discovery of the Rous sarcoma virus (RSV), the Nobel Prize.
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