Breast cancer is surging among Asian American women — and scientists don’t know why — SkimNews
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- UC San Francisco researchers, publishing in JAMA Network Open, found breast cancer incidence rose more than 3% annually in nearly every Asian American ethnic group from 2000 through 2022, with even steeper increases among Chinese and Vietnamese women.
- Triple-negative breast cancer — the most aggressive subtype — climbed more than 6% each year among Chinese American women between 2017 and 2022.
- By 2022, breast cancer rates among Asian American women under 50 had become comparable to those of non-Hispanic white women the same age, erasing a long-standing gap.
- Researchers analyzed roughly 150,000 invasive breast cancer cases from the NCI's SEER Program across nine AANHPI populations in 14 states, and found the fastest increases occurred among cancers already at advanced stages — a pattern that rules out screening uptake as the main driver.
- Native Hawaiian women already had among the highest breast cancer rates in the U.S., but their rates rose only about 1% per year — substantially less than the increases seen in Asian American groups.
- Senior author Scarlett Lin Gomez said the findings underscore why AANHPI populations must not be treated as a single group in research or care; two follow-up UCSF studies (CRANE and ASPIRE) are now underway to investigate unknown risk factors.
Why it matters: The historical gap in breast cancer incidence between Asian American and non-Hispanic white women under 50 has effectively closed by 2022, undermining long-standing clinical assumptions of lower AANHPI risk. The triple-negative surge of more than 6% annually in Chinese American women signals that unidentified risk factors are reshaping the disease's profile in these communities — making targeted research and screening recalibration urgent, not optional.
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