FIGHTING CANCER: TALKING WITH YOUR DOCTOR ABOUT CANCER
Monday, May 23rd, 2011
Tuesday, July 26th, 2011
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Monday, May 23rd, 2011
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Thursday, January 20th, 2011
THE IDENTIFIABLE CAUSES OF CANCER: RADIATIONThe question the reader will ask at this point is ‘Given all this epidemiological study, do we know the causes of cancer?’ Broadly the answer is ‘yes’ in many circumstances and for many cancers, and the opportunities for prevention that this understanding generates are there to be taken. We do not always know how the factors that have been identified by the epidemiological studies discussed in this chapter link up to what is being learned in the laboratories of the molecular biologists. This connection is being made rapidly and will be increasingly clear by the end of the century. Epidemiology has been very successful in discovering or confirming which features of our lives in the Western world can be now identified as causes of cancer. The effects of radiation as a cause of cancer are probably as well understood as anything else, except perhaps those of smoking. Survivors of the atomic bombs and people given low doses of radiation for medical treatments decades ago ail have a higher chance of getting certain cancers, particularly leukaemias. Ordinary diagnostic X-rays now deliver only tiny amounts of radiation and appear not to have any adverse effect in adults but it is wise to keep them to the minimum necessary. Uranium miners seem to get more lung cancer than would be expected and there is Currently much research, which is not yet conclusive, into a connection between cancer and the indoor levels of some radioactive gases (such as radon) rising from rocks. One of the difficulties in dealing with radiation as a cause of cancer is uncertainty about the relationship between the dose of radiation received and the level of increased cancer risk. Under some circumstances, very low doses may be associated with subtle effects on cancer risk.Protection against radiation is well established in the workplace but more research work is needed on the effects of low levels of radiation. The protection of society as a whole against the possible hazards of radiation obviously raises complex economic, political and social issues.*32\194\4*
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