Similar to the ACS report, a recent study published in JAMA Network Open reported rising breast cancer incidence among US women aged 20-49 years of different races in different age groups over the past 2 decades.
The increased incidence of breast cancer in younger women “is an area of concern and an area where we really need to spend more effort trying to understand why,” said lead study author and breast surgeon Adetunji T. Toriola, MD, PhD, MPH, of Washington University in St Louis, Missouri.
Although reproductive and lifestyle factors, such as weight gain, diet, and physical activity, may contribute to the growing breast cancer incidence in younger women — and preliminary findings from Dr. Toriola’s own research suggest that reproductive factors may be a particularly strong driver — environmental factors, including exposure to forever chemicals, may also play a role.
Early-life factors, such as exposure to toxins, remain an underexplored area, Dr. Toriola noted, stressing the importance of teasing out the long-term effects of environmental exposures in puberty and during adolescence.
Overall, the trends observed both in this study and the ACS report highlight the need for enhanced prevention efforts that address racial disparities as well as the rising incidence in young women, said Dr. Toriola, also professor of surgery at the Washington University Institute of Public Health, St Louis.
For now, Dr. Toriola urges women to “engage with mammographic screening as soon as qualified” as per guidelines. Women at average risk should go for screening beginning at age 40, and those with a family history or other risk factors should talk to their physician about earlier screening, he said.
Ms. Giaquinto is employed by the ACS, which receives grants from private and corporate foundations, including foundations associated with companies in the health sector, for research outside of the submitted work. Dr. Toriola reported having no disclosures.
A version of this article first appeared on Medscape.com.