Hundreds of people received letters last month telling them they may have cancer, but they were mistaken. Grail, the maker of Galleri, a blood test designed to detect over 50 types of cancer, said in a statement that the erroneous letters were sent to around 400 people. San Diego-based Illumina owns Grail. MORE: https://www.cbs8.com/article/news/local/letter-incorrectly-tells-hundreds-of-patients-they-have-cancer/509-79c6beb8-e6ae-44e4-a2c8-da8ebb2da31e