PACIFIC SUNSET APRIL 2015 I came across a new blood test showing promise in detecting 50 different cancers.

called Galleri 

https://www.galleri.com/multi-cancer-early-detection

It's made by a private company in California (Grail).

https://www.nature.com/articles/s41416-021-01498-4

For the Galleri test: I feel like this is complicated. On one end, things are moving towards stool-based DNA testing with colon cancer, for example. However, those tests are based on a different technology. I am uncertain about the idea that a single test can detect 50 distinct cancers. I honestly believe that for it to be implemented on a larger scale, some publications should be present in American Family Physician, JAMA, or something like The New England Journal of Medicine, for example. Another concern with this type of test's use before being validated is that patients may feel a false sense of security following a negative test result. And that a negative test result may prevent the patient from undergoing recommended cancer screening.