Breast cancer is one of the most common cancers affecting women worldwide. You may see figures like “1 in 9” or “1 in 8”—these are lifetime risk estimates, meaning the chance of developing breast cancer at some point over an entire lifetime, not all at once or suddenly rising overnight.
The number can vary slightly by country and over time due to better screening, longer life expectancy, and improved detection—not necessarily because the disease is rapidly increasing in a shocking way.
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