Recent studies show breast cancer is the most common cancer in women under 50, fueling longstanding concerns about a possible link between devices like cellphones and cancer.

Early-onset breast cancer is on the rise in younger women in the U.S., according to two new peer-reviewed studies, leading some experts to wonder if cellphone use could be at least partially to blame.

The authors of an Aug. 16 study in JAMA Network Open looked at the health data from 2010 to 2019 of more than half a million people in the U.S. under 50 who reported having some kind of early-onset cancer.

They concluded breast cancer in 2019 had the highest incidence rate, with 12,649 new cases reported that year.