Breast cancer screening means one in three have unnecessary treatment?

According a piece in the Guardian's Health and Wellbeing section -  written in partnership with the British Medical Journal - one in three women diagnosed with breast cancer after a screening test will have slow-growing forms of cancer that could safely go untreated, according to new research. Although breast cancer screening saves lives, it also means that some women go through the worry and side effects of unnecessary treatment.

Abnormal, uncontrolled cell division resulting in a malignant tumour that may invade surrounding tissues or spread to distant parts of the body. Full medical glossary
A way to identify people who may have a certain condition, among a group of people who may or may not seem to Full medical glossary