A blood test that detects tumor DNA circulating in the bloodstream may help select the most effective treatment options for cancer patients whose tumors have started to spread, according to one of the largest randomized controlled trials of its kind presented at the Congress of the European Society for Radiotherapy and Oncology (ESTRO 2026).

By Nancy Lapid May 27 (Reuters) - People who skip colorectal cancer screening because colonoscopy or stool testing seems too burdensome now have a blood test option from Guardant Health among recommendations by the American Cancer Society for detecting the disease,

The American Cancer Society is updating its guidelines to include a new screening for the most frequently diagnosed cancer. A blood test is now an option when getting checked