Race, Ethnicity and Breast Cancer Risk

Rates of breast cancer in the U.S. vary by race and ethnicity.

Non-Hispanic white women and non-Hispanic Black women have the highest incidence of breast cancer (rate of new breast cancer cases) overall [324]. Hispanic women have the lowest incidence (see Figure 2.3 below) [324].

Figure 2.3

Source: 2017-2021 SEER data, 2024 [324]

Learn about differences in breast cancer rates in the U.S. and around the world.

Lifetime risk of breast cancer by race and ethnicity

The lifetime risk of breast cancer for women in the U.S. is about 13% [643]. However, this risk varies by race and ethnic group.

Race and ethnicity	Lifetime risk of breast cancer
Non-Hispanic White	14%
Non-Hispanic Asian and Pacific Islander	12%
Non-Hispanic Black	12%
Hispanic	11%
Non-Hispanic American Indian and Alaska Native	10%
Source: SEER data, 2024 [644]

 

Why are there differences in breast cancer rates?

One reason behind differences in breast cancer rates may be that the prevalence of some risk factors for breast cancer vary by race and ethnic group [13]. This means some risk factors are more common in women of some racial and ethnic groups than in other women.

Known risk factors that vary by race and ethnicity include [326-335]:

• Age at first menstrual period
• Age at menopause
• Age at first childbirth
• Body weight
• Breastfeeding
• Number of childbirths
• Menopausal hormone therapy (postmenopausal hormone use, hormone replacement therapy (HRT))

For example, studies show white women are more likely than women of some other ethnicities (including Black and Hispanic women) to have children at a later age, to have fewer children and to use menopausal hormone therapy [13,328-329,333-335]. These factors are linked to an increased risk of breast cancer [13].

Learn more about rates of breast cancer by race and ethnicity.

Learn about race, ethnicity and breast cancer screening.

Black women

Overall, non-Hispanic Black women have lower rates of breast cancer than non-Hispanic white women [324].

The reasons behind these differences are under study. They may include some risk factors that are more common in women of some racial and ethnic groups than in other women as well as differences in tumor biology [326-335].

Age at diagnosis

Non-Hispanic Black women tend to be diagnosed with breast cancer at a younger age than non-Hispanic white women [7].

From 2017 to 2021, the median age at diagnosis for non-Hispanic Black women was 61, compared to 65 for non-Hispanic white women [7].

The median is the middle value of a group of numbers, so about half of non-Hispanic Black women were diagnosed before age 61 and about half were diagnosed after age 61. Among non-Hispanic white women, about half were diagnosed before age 65 and about half were diagnosed after age 65.

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Learn more about breast cancer in Black women.

Triple negative breast cancer (TNBC)

Incidence rates (new cases per year) of triple negative breast cancer (TNBC) differ by race and ethnicity.

TNBC is:

• Estrogen receptor-negative (ER-negative)  
• Progesterone receptor-negative (PR-negative)  
• HER2-negative  

TNBC is more common among Black and African American women than among women of other ethnicities [332,338-341]. TNBC may also be more common among Hispanic women compared to white and non-Hispanic white women [342-344].

TNBC is often aggressive. Early TNBC is more likely than estrogen receptor-positive breast cancers to recur, at least within the first 5 years after diagnosis [341,345].

After about 5 years, the risk of TNBC recurrence is low [341,345].

Possible reasons for differences in rates of TNBC

Although the reasons for racial and ethnic differences in rates of TNBC aren’t clear, some factors may play a role [346].

Compared to white and non-Hispanic white women, studies show Black and African American women tend to [123-124,329,346-348]:

• Have lower rates of breastfeeding
• Carry excess weight in the abdomen area

Each of these factors is linked to a small increased risk of TNBC [123-124,329,346-348].

Women with certain reproductive and lifestyle factors may have a lower risk of estrogen receptor-positive breast cancers, but not a lower risk of estrogen receptor-negative breast cancers, including TNBC [75-76,80-81,123,329,335,343,349].

Black and African American women may be more likely than white women to have risk factors linked more to a lower risk of estrogen receptor-positive cancers than to a lower risk of TNBC [75-76,80-81,123,329,335,343,349].

For example, non-Hispanic Black, African American, Hispanic and Latina women are more likely than white women to [123,329,335,343,347-349]:

• Have more children
• Be a younger age at first childbirth
• Be overweight or obese before menopause

Although these factors are linked to a lower risk of breast cancer, this lower risk may be limited to estrogen receptor-positive breast cancers [75-76,80-81,123,329,335,343,349].

There’s even some evidence these factors may be linked to an increased risk of TNBC [75-76,80-81,123,329,347].

These topics are under study.

Learn more about rates of breast cancer by race and ethnicity.

Learn more about the molecular subtypes of breast cancer.

Updated 09/23/24