Breast Cancer Rates Soar Among Asian American Women

A new study led by researchers at the University of California, San Francisco (UCSF), has revealed a disturbing surge in invasive breast cancer among Asian American women over the past two decades. The alarming trend has left scientists scratching their heads, as they struggle to identify the underlying causes.

The study, published in JAMA Network Open, analyzed data from approximately 150,000 invasive breast cancer cases diagnosed between 2000 and 2022. The data came from the National Cancer Institute’s Surveillance, Epidemiology, and End Results (SEER) Program. The researchers found that breast cancer rates have climbed across nearly every Asian American ethnic group at a pace that exceeds increases seen in any other U.S. ethnic group.

The trend is particularly concerning among women under 50 and those diagnosed with advanced disease or certain aggressive forms of breast cancer. In fact, the study found that breast cancer incidence among Asian American women under 50 had become comparable to the rate among white women of the same age group by 2022.

Triple-Negative Breast Cancer: A Growing Concern

One particularly alarming finding involved triple-negative breast cancer, which is considered the most aggressive subtype. Among Chinese American women, cases of triple-negative breast cancer increased by more than 6% each year between 2017 and 2022. This trend is a major cause for concern, as triple-negative breast cancer is often more challenging to treat and has a poorer prognosis.

Researchers say that greater use of breast cancer screening probably does not explain the trend. Screening tends to identify more cancers at earlier stages, yet the fastest increases occurred among cancers that had already spread. This suggests that other factors, such as changes in reproductive patterns, diet, and lifestyle, may be contributing to the trend.

The study’s lead author, Scarlett Lin Gomez, PhD, a professor of epidemiology and biostatistics at UCSF, emphasized the importance of understanding the underlying causes of the trend.