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Breast cancer
is responsible for 30% of all new cancer cases in women. Over the
last several decades the size of tumors detected has decreased
dramatically. In addition, it has been reported that the 5-year survival
rate for breast cancer when found and treated early is approximately 93%
(Landis). This has led to better screening techniques and guidelines for
earlier detection with mammography and clinical breast examination
(CBE).
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The effectiveness of
mammography and CBE in detecting early breast cancer has been studied
extensively. Since the 1960s several case-control and cohort studies, as
well as nine major randomized controlled trials of breast cancer
screening, have been conducted. This unparalleled accomplishment in cancer
prevention research has included up to 500,000 women. These trials provide
scientific evidence that supports breast cancer screening with mammography
alone or with CBE for women aged 50 years or older. Although there are no
randomized trials of the effectiveness of CBE alone compared with no
intervention, there is clear evidence from multiple controlled trials that
the combination of mammography with CBE significantly reduces in breast
cancer mortality. Therefore, it is crucial that physicians be well trained
to perform CBE as an integral component of breast cancer
detection. |
