One year after diagnosis, survival for women with early-stage breast cancer was close to 100% in all six countries.

BBC: A mammography of a woman's breast

To take one of many examples, a group of researchers at the American Cancer Society looked at 533, 715 women with breast cancer, and asked: When those women were first diagnosed with breast cancer, were they diagnosed with early-stage or late-stage disease?

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In Denmark, only 30% of women with breast cancer were diagnosed at an early stage, compared with 42-45% elsewhere.

BBC: A mammography of a woman's breast