cjgaddy, I think your search here is quite conclusive, THANKS!
So this test can detect the following:
A) HAS CANCER (BINARY YES or NO, incl. pro-active use) B) STAGING C) CLASSIFYING THE TYPE OF CANCER ( D) ASSESSING CANCER PROGRESSION or REGRESSION E) ASSESSING THE EFFICACY OF CANCER THERAPY
That is IMPRESSIVE, that ranges from taking this test PROACTIVELY, over as part of a DIAGNOSTIC into MONITORING and FOLLOW-UP.
For most patients this is not just one single test. This is a series of pro-active tests and/or several tests when you would have contracted a cancer.