A study conducted by researchers at the University of California, Irvine, reveals that exposure to certain per- and polyfluoroalkyl substances (PFAS), often referred to as 'forever chemicals,' may increase the risk of acute lymphoblastic leukemia, the most common type of childhood cancer. The researchers analyzed dried blood samples from 125 children diagnosed with leukemia and 219 healthy children born in Los Angeles County between 2000 and 2015. They found that higher levels of PFOA and PFOS, two common PFAS chemicals, were linked to an increased risk of leukemia. The study builds on previous research that connected PFAS in drinking water with childhood cancers. While the findings do not establish a direct cause-and-effect relationship, they suggest that early exposure to these chemicals could contribute to cancer risk in children. The research indicates that PFAS contamination is widespread, and the study calls for further investigation into the health impacts of these chemicals and potential measures to reduce exposure. The study was supported by a grant from the National Institutes of Health and involved collaboration with several universities, including Yale and UC Berkeley.