An American study
has released information on the most common cause of cancer (Sydney Morning
Herald, January 3-4, 2015).
Researchers from
John Hopkins Kimmel Cancer Center in the School of Medicine looked into why some
people can smoke and drink excessively and remain cancer free while others with
healthier lifestyles received a cancer diagnosis. Was “just good genes” the
reason why some people remained cancer free?
Their study
revealed that “all cancers are causes by a combination of bad luck, the
environment, and hereditary.” The researchers created a model to help quantify
the impact of each of these factors on cancer development. The study involved
comparing stem cell divisions in 31 cancer types and determining which ones
were driven by the “bad luck” factor of random DNA mutations and which cell
divisions had a higher incidence due to a combination of factors.
The result was
that bad luck was responsible for 67% of adult cancer while the remaining cases
were due to environmental risk factors and inherited genes. Hence bad luck
plays a significant role in determining whether a person is diagnosed with
cancer during their lifetime, according to researchers.
Dr. Bert
Vogelstein of John Hopkins University said the findings should not be an excuse
to be complacent about cancer. “This study shows that you can add to your risk
of getting cancers by smoking or other poor lifestyle factors” so people should
still opt for a healthier lifestyle to reduce their risk.
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