Scientists have found evidence that the reduced effectiveness of breast screening in women in their 40s is mainly due to their tumours being harder to detect, rather than because they grow faster.Previous research has suggested that breast screening is less effective in women in their 40s than in older women.Two reasons have been identified for this - firstly, that younger women tend to have denser breast tissue which makes it harder to detect tumours on a mammogram; and secondly, because younger women's tumours tend to grow more quickly.
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