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The recent flood of criticisms of mammography is continuing unabated.
A recent report in the British Medical Journal has posed the question
"Is clinical breast examination an acceptable alternative to mammographic
screening?"
While the widespread use of mammography would lead
the average person to believe that this matter has already been settled,
the authors assert that this is simply not the case. In their review of
the issue, they note:
Breast cancer screening and mammography have almost
become synonymous in the public perception, yet this should not necessarily
be the case. Ideally, a screening tool for breast cancer would reduce
mortality from breast cancer while having a low false alarm rate and
being relatively cheap.
Clinical breast examination is also relatively
simple and inexpensive, but its effectiveness in reducing mortality
from breast cancer has not been directly tested in a randomized trial.
Mammography is complex, expensive, and only partially effective.
We believe that there is sufficient
circumstantial evidence to suggest that clinical breast examination
is as effective as mammography in reducing
mortality from breast cancer and that the time has come to compare these
two screening methods directly in a randomized trial.
The authors conclude with the following summary
points:
- The goal of breast screening is to prevent
death and not simply to detect cancers by mammography
- Mammography does detect
some cancers "early," but many of these are not potentially
lethal and their detection causes needless anxiety
- Clinical breast examination is more likely
to detect cancers that are potentially lethal
- Results of a recent Canadian
study suggest that mammographic detection of cancers that are not palpable
does not affect mortality
- New British guidelines on informed consent
state that women should be informed of the drawbacks
of mammography as well as its potential benefits
In an emailed response to the article, Dr.
BC Boyd of the University of the West Indies, voices his hesitation
at promoting universal mammograms to his patients:
Medicine can sometimes be like women's (and men's) fashions
- certain features become "in vogue"! (Note the waning interest
now in the PSA). Mammography, I believe, is now in vogue My arguments
to my patients (and my colleagues) continue to be:
1) The uncertain value of mammography in reducing
the mortality from breast cancer
2) The extraordinary
discomfort involved in the procedure (some
would say unacceptable)
3) The psychological trauma which accompanies
the request for diagnostic biopsy and surgery (where the radiological
diagnosis is in doubt)
4) The continued anxiety
raised when a routine mammography reveals a "lesion" that
is diagnosed as non-malignant
5) The extensive costs required for the special
training of adequate numbers of radiologists in this field
6) The doubtful cost
effectiveness of this procedure where priorities in health care must
be taken into account -particularly in the presence of "structural
adjustments" demanded by the World Bank
British Medical Journal,
October 28, 2000; 321: 1071-1073
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