While fewer and fewer women die from breast cancer, the decline is just as large in the age groups that do not go for breast cancer screening…
What does this mean?
According to the Danish-Norwegian discovery, the decline is due to better treatment and not screening for breast cancer.
Women followed for 23 years
Researchers followed all Norwegian women aged 30-89 and identified those who developed breast cancer in the period 1987-2010, before subsequently comparing the number of deaths before and after the screening programme was introduced.
As Associate Professor Henrik Støvring from Aarhus University, Denmark, notes, the result does not favour the breast cancer screening programme.
“The important result is that we do not find a beneficial effect of breast cancer screening any longer. The original randomised trials examining breast cancer screening were conducted way back in the 1980s, and they showed an effect, but the fact is that the better the treatment methods become, the less benefit screening has,” says Støvring.
The most important finding
This study shows that screening does not lead to women living longer overall – and this is the study’s most important finding.
“The women who are invited to screening live longer because all breast cancer patients live longer, and they do so because we now have better drugs and more effective chemotherapy, and because we have cancer care pathways, which means the healthcare system reacts faster than it did a decade ago. But it does not appear that fewer women die of breast cancer as a result of mammography screening,” says Støvring.
The problem of over-diagnosing
He also points out that it is not always beneficial for a woman to be diagnosed with a tiny cancerous growth of e.g. a millimetre in diameter at a mammography. Some of these small nodules are so slow-growing that the woman would have died a so-called natural death with undiagnosed cancer if she had not been screened.
“Now what happens is these women are instead given a diagnosis which isn’t going to make anyone happier. Such a breast cancer diagnosis both makes life more difficult and costs a lot of money, but does not ultimately make a difference. The problem is that we are not currently able to tell the difference between the small cancer tumours that will kill you and those that will not,” says Støvring.
Here he addresses the issue of overdiagnosis which is a growing problem in all Western countries where the approach to medicine and examinations is extensive and where national screening programmes are prevalent – a roblem that was discussed last week in Copenhagen, Denmark, where 450 researchers from thirty countries attended the Preventing Overdiagnosis 2018 conference.
Regular physical examinations may be better than mammography
Even though the research results challenge the current health policy in Denmark, Norway and the rest of the Western world, Henrik Støvring is not in the business of telling Danish politicians that they should stop the national screening programme here and now:
“It’s certainly not my task to decide how the research results should be used, but my suggestion would nonetheless be that we should get together and begin to investigate whether it would beneficial to do something other than screening and whether this could have a better effect. If a doctor could instead examine women’s breasts with his or her hands, what is known as palpation, at regular intervals, then we would avoid much of the overdiagnosis,” says Henrik Støvring.
Source: Aarhus University via www.sciencedaily.com
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