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early x-ray screening for cancer ineffective.
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X-ray not good for lung cancer screening Thu Oct 27, 2011
An
advanced lung tumor detected by chest X-ray. Routine chest X-rays
has not been a successful screening test for early diagnosis of
lung cancer in smokers and former smokers which may lead to lower
death rates.
A study of more than 150,000 older US American people aged 55 to
74 showed that the death rate of those who undertook four annual
screening chest X-rays were almost equal with those who didn't
have those routine exams.
The new large research funded by the National Cancer Institute
supported the results of previous smaller studies suggesting that
X-ray is not a suitable screening test for lung cancer.
During the 13 years follow up, there were 1,696 lung
cancers detected in the intervention group and 1,620 lung cancers
in the usual care group," according to the report published
in the Journal of the American Medical Association (JAMA).
However, 1,213 lung cancer deaths were observed in the
intervention group versus 1,230 in the usual care group.
Lung cancer which is more common in older adults is the deadliest
type of cancer for both men and women. Each year, more people die
of lung cancer than of breast, colon, and prostate cancers
combined. Cigarette smoking is the leading cause of lung cancer
while second hand smokers and none smokers are also at risk.
Chest X-ray screening for lung cancer was common decades ago
while still some physicians continue to recommend it for smokers
and former smokers but, the new study backed by the US government
has showed the practice to be useless.
There really was no benefit of the screening, said
study co-author Dr. Christine Berg. We detected some of the
cancers a little earlier than we would have, but not early enough
or in large enough numbers to really have an impact on lung
cancer mortality.
CT scans, which provide much more detailed images than X-rays has
showed to be more successful in early detection of lung cancer
and preventing deaths among current or former heavy smokers.
However, none of the major medical group has recommend the more
expensive technique as a routine lung cancer screening test and
are studying to suggest new guidelines to replace regular chest X-rays.
"Lung cancer screening with low-dose helical CT is the
only technology that has ever been shown to lower lung cancer
mortality, Berg said.
But the downsides of CT scans are that they're more expensive,
and they have many more false positives because they're much
sensitive, she added.
SJM/JRwww.pressTV.com