Abstract
IN a paper which appeared in the British Medical Journal of Jan. 28 last, I brought together a number of facts from which the deduction was made that a localised increase of the carbon dioxide tension in the tissues, due to a diminished blood supply, may be an important factor in the cancerous change of cells, and may even be the factor common to many known ‘causes’ of cancer. Exactly how an increase in carbon dioxide tension could alter the cells so that afterwards they continue to behave in an abnormal manner for a vast number of generations, was not suggested. Some recent observations made upon in vitro cultures of rat kidney under varying carbon dioxide tensions are suggestive in this connexion. Before dealing with these, and in view of the fact that both X-rays and radium cause cancer, I propose very briefly to refer to some of the effects of these radiations on living cells.
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