In my travels I came across this... GASTROClear for HC Professionals - Gastroclear

It is a blood test for gastric cancer. My mom passed of that and generally it is excessively difficult to find until you are end stage. There usually aren't symptoms until that time. This test is new so it might not be available here yet, but, in Asia (which has more gastric cancer than the west) the tests sold out. It is considered pretty accurate. It found 60% of early gastric cancers. Think how many people that could save.