The strong opposition which existed a decade or two ago to the theory of a virus aetiology of cancer in man, although still existing in some quarters, is gradually disappearing. No one now speaks of a ‘milk factor’ with reference to the vivus causing mammary cancer in mice or the ‘agent’ with reference to the Rous sarcoma virus. It was the work carried out on these tumours which finally swept away all conceptions of ‘factors’ and ‘agents’.
KeywordsMammary Cancer Virus Aetiology Yellow Fever Virus Polyoma Virus Tobacco Necrosis Virus
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