A study found that prenatal cell-free DNA tests detected cancer in 48% of expecting mothers with abnormal results, including colon, breast, lung, kidney, lymph gland, bile duct, and pancreatic cancers. Whole-body MRI scans were most effective at detecting cancers, followed by cell-free DNA tests, while standard diagnostic techniques were least useful. Researchers suggest additional testing for women with abnormal prenatal test results due to a 48% risk of cancer.