May 9 (UPI) -- Blood tests could catch as many as half of cancers at an earlier, more treatable stage, a new study says. If conducted every year or every other year, the multi-cancer early detection blood test could help more people survive cancer, researchers reported Thursday in BMJ Open . "Both annual and biennial MCED screening intervals have the potential to avert deaths associated with late-stage cancers when used in addition to current guideline-based cancer screening," concluded a