A 17-year research has concluded that screening mammography — through which all girls in sure age teams are routinely screened for breast most cancers — doesn't cut back the incidence of superior tumors, however does enhance the prognosis of lesions that may by no means have led to well being issues.
In Denmark, screening was applied in numerous areas at completely different occasions, so researchers there have been in a position to evaluate teams of ladies who have been screened with those that weren't.
If screening have been efficient, a discount within the incidence of superior tumors can be anticipated — tumors can be caught and handled when small. As a substitute, the researchers discovered no distinction in incidence between screened and unscreened teams. However in screened teams, they discovered substantial overdiagnosis — that's, detection of tumors that may not develop into cancers needing therapy.
The research, in Annals of Inner Drugs, discovered that, relying on age and different components, between a fifth and a 3rd of tumors detected by screening have been overdiagnosed. The researchers concluded that screening doesn't stop superior cancers or decrease breast most cancers mortality.
"Some kinds of screening are a good suggestion — colorectal, for instance," mentioned the lead writer, Dr. Karsten Juhl Jorgensen, deputy director of the Nordic Cochrane Middle. "However breast most cancers has a biology that doesn't lend itself to screening. Wholesome girls get a breast most cancers prognosis, and this has severe psychological penalties and well-known bodily harms from pointless therapy. We're actually doing extra hurt than good."
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