A while back I wrote about Galleri, the holy grail of cancer screening tests, saying:
Cancer is usually treatable if caught early. The cancers that are the deadliest (such as pancreatic cancer) are lethal because they are difficult to catch early. Many deadly cancers have no symptoms until they’ve spread. About 90% of cancer deaths are due to metastatic cancer, that is cancer that has spread beyond the original location. In theory most cancer could be treatable if only it could be caught sooner, before it has a chance to spread.