Around 2.3 million women are diagnosed with breast cancer worldwide each year, making it the most common cancer in women globally. In the United States alone, an estimated 310,720 new cases of invasive breast cancer were expected in 2024, and that number is projected to rise to about 321,910 in 2026. Breast cancer accounts for roughly 15% of all new cancer diagnoses in the U.S.
Lifetime Risk and Global Differences
A woman’s chance of being diagnosed depends heavily on where she lives. In highly developed countries, 1 in 12 women will be diagnosed with breast cancer in their lifetime. In lower-income countries, that figure drops to 1 in 27, likely reflecting differences in screening access, reproductive patterns, and life expectancy rather than a true biological advantage. The mortality gap tells a grimmer story: in high-income countries, 1 in 71 women die of breast cancer, while in low-income countries the figure is 1 in 48. Fewer women in those regions get diagnosed, but a much larger share of those who do will die from the disease.
Diagnosis Rates Are Rising in Some Groups
Breast cancer is not becoming less common. Among women younger than 45, diagnoses increased an average of 0.7% per year between 2001 and 2022. That trend accelerated after 2012, with rates climbing 1.1% per year through 2022. Researchers are still working to understand why younger women are seeing this uptick, but changes in body weight, later age at first pregnancy, and shifts in reproductive patterns are all considered contributing factors.
The trend varies by race and ethnicity. Between 1999 and 2018, diagnosis rates among white women actually fell slightly, declining about 0.3% per year. Rates among Black women held essentially steady over the same period. Asian and Pacific Islander women saw the sharpest increase: rates were flat until about 2005, then rose 1.4% per year through 2018. Hispanic women followed a similar pattern, with rates dipping until 2004 and then climbing 0.4% annually after that.
In raw numbers, white women still have the highest incidence rate (about 187 per 100,000 in 2018), followed by Black women (174 per 100,000), Asian and Pacific Islander women (144 per 100,000), and Hispanic women (134 per 100,000). But these gaps are narrowing as rates in non-white groups trend upward.
What Stage Most Women Are Diagnosed At
The good news is that most breast cancers are caught before they spread. From 2018 to 2022, about two in three cases (66.5%) were diagnosed at a localized stage, meaning the cancer had not moved beyond the breast. Roughly one in four (25.2%) were found at a regional stage, where the cancer had reached nearby lymph nodes or tissue. Only 6% were diagnosed after the cancer had spread to distant parts of the body.
Early detection matters enormously for outcomes. Localized breast cancer has a far better prognosis than cancer found at later stages, which is the core argument behind routine mammography screening. That said, screening is not without trade-offs. A Yale study found that among women aged 70 to 74 who had regular mammograms, about 31% of the cancers found would likely never have caused symptoms or harm. That rate of overdiagnosis rose to 47% in women aged 75 to 84 and 54% in women 85 and older, meaning that for older women, screening sometimes detects cancers that would never have become a problem during their remaining lifetime.
Types of Breast Cancer Diagnosed
Not all breast cancers behave the same way, and the type matters for treatment and prognosis. The vast majority, about 70%, are hormone receptor-positive and HER2-negative. These cancers grow in response to estrogen or progesterone and tend to respond well to hormone-blocking therapies. About 9% are both hormone receptor-positive and HER2-positive, and roughly 4% are hormone receptor-negative but HER2-positive. Both of these groups can be treated with targeted therapies that block the HER2 protein.
The most challenging subtype is triple-negative breast cancer, which makes up about 11% of diagnoses. These cancers lack all three common receptors, leaving fewer targeted treatment options. Triple-negative breast cancer tends to grow faster and is more common in younger women and Black women.
Men Get Breast Cancer Too
About 1 out of every 100 breast cancers diagnosed in the United States occurs in a man. That translates to roughly 2,800 cases per year. Male breast cancer is rare enough that many men don’t realize they can develop it, which sometimes leads to later-stage diagnoses. The biology is similar to female breast cancer, and treatment follows many of the same approaches.