Is it true that you can detect breast cancer at an early stage from a blood test?

In theory it sounds perfect, but in practice it's not quite there yet. There are studies on blood markers that help detect tumors, but they work best when the disease is already present rather than at very early stages - and the results often need confirmation by other methods like mammography or ultrasound. In regular clinics, these tests haven't become a screening tool yet because their reliability isn't sufficient for mass use without additional checks.

Yes, research in this direction is moving actively, but for now blood tests work more as a complement to mammography rather than a replacement. The problem is that at very early stages, when the tumor is still tiny, markers in the blood can still be within normal range or at the edge of the test's sensitivity threshold - that's why mammography remains the gold standard for screening.

These tests are already available at clinics, but doctors usually order them for people with elevated risk or when there are already some suspicious findings on imaging. It will be revolutionary when the accuracy of these tests reaches the level where we can catch cancer at the very earliest stages - it's a matter of time, but we're not there yet.