In the early 2000s, the journal of the Canadian Medical Association, which represents physicians in Canada, published the results of a study that came to the conclusion that regular breast self-exam (BSE) by women does not reduce the risk of dying of breast cancer.
This unleashed a storm of anger from breast cancer survivors and doctors alike. The American and Canadian Cancer Societies had been recommending monthly BSE for women since the early 1950s! Many breast cancer survivors had discovered their cancer themselves and gave vigilance with BSE as the reason that they were still alive. Nevertheless, the Canadian Cancer Society stopped recommending monthly breast self-examination.
The report that garnered so much attention had analyzed many studies related to BSE and death due to breast cancer – this is called a meta-analysis – and discovered that although BSE appears to be a simple and low-cost method of catching cancer early, it is not. It is difficult to learn to do well and to perform consistently. There was also some evidence that it caused more medical interventions when a non-malignant "lump" was discovered and investigated. It was reasoned that this would lead to an increased cost burden to the health care system and needless worry by women without a corresponding benefit in saved lives.
Given this controversy, what are the latest guidelines? The current consensus appears to be that while women should become familiar with their breasts, monitor their breasts regularly and look for signs of cancer, breast self-examinations are not generally recommended as more recent studies fail to show that they save women’s lives.
Mammograms are low-dose X-rays of the breast that are used to detect breast cancer. Mammograms are used for screening and diagnostic purposes. Screening mammograms look for breast cancer signs that may be developing, even if you are not experiencing symptoms. Diagnostic mammograms are used if you have a lump in your breast or other symptom that needs further investigation.
The controversy over mammograms is focused on whether regular screening mammograms should be recommended for women under the age of 50. For women over 50, there is general consensus in the medical community that regular screening mammograms after menopause find breast cancers at an early stage, when treatment is most likely to be successful. However, mammograms done in younger women can lead to overdiagnosis, where harmless forms of breast cancers are found and unnecessarily treated, as well as false positive tests.
So what's a girl to do?
In Canada, the consensus is that most women between 50 and 74 should have a mammogram every 2 to 3 years to screen for breast cancer, and that this practice saves lives.
Women at higher risk for breast cancer may consider starting earlier. It's best to talk to your doctor about when to start getting regular mammograms.
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