Sulaco,
Your statement is making the assumption that early detection of cancer via a positive test result like Bavi might help provide carries a parallel to a mammogram positive detection. I disagree.
More relevant is real family experience. My brother in law passed away due to progression of prostate cancer. A sad dynamic is the prostrate screening, PSA test had shown elevated levels, but the lab and clinic did not forward the results (clerical error sent results to file without a report being issued) to the attending doctor or my brother in law. A routine screening three years later showed positive PSA, follow up was expedient, but treatment was too late. Three years later, my sister is a widow, despite trial participation that was credited with prolonging life.
Early cancer detection matters- it can be a life and death difference. Detection of lumps via a mammogram (imaging detection) and positive labeling of the presence of cancer (biochemical marking) is an apples to oranges comparison.
Best wishes and IMO.
KT