Breast cancer is surging among Asian American women — and scientists don’t know why
Get the Health newsletter
Daily health & science — research, biotech, public health, the studies worth knowing. Free.
- UCSF-led study analyzed ~150,000 invasive breast cancer cases from 2000 through 2022 and found incidence rose more than 3% annually in nearly every Asian American ethnic group, exceeding increases in any other U.S. ethnic group
- Chinese American women saw triple-negative breast cancer—the most aggressive subtype—increase by more than 6% each year between 2017 and 2022
- Native Hawaiian women already had some of the highest breast cancer rates in the U.S., but their rates rose only about 1% per year, substantially less than other Asian American groups
- Researchers say greater screening use cannot explain the trend, as the fastest increases occurred in cancers that had already spread at diagnosis, not early-stage detections
- By 2022, breast cancer incidence among Asian American women under 50 had become comparable to white women of the same age, nearly closing a historical gap
- Senior author Scarlett Lin Gomez called the patterns "highly concerning from a disparities standpoint" and urged treating AANHPI communities as distinct populations rather than a single group
- Scientists have not yet identified the cause; changes in reproductive patterns, diet, and lifestyle may contribute but do not fully explain the surge, prompting two new UCSF studies (CRANE and ASPIRE) to search for answers
Why it matters: The study drew on SEER data covering ~150,000 cases across 14 states—home to roughly two-thirds of the U.S. AANHPI population—making the trend signal difficult to attribute to artifacts or small sample sizes. The >6% annual rise in triple-negative breast cancer among Chinese American women between 2017 and 2022 is the most clinically alarming finding, since this subtype has the fewest treatment options and worst prognosis. Researchers' explicit admission that the cause is unknown means targeted prevention strategies remain undefined for the affected communities.
Ask SkimNews
