I was told by my oncologist that tumour markers are not an accurate test for everyone. I have mine tested every few months and it usually shoots up when my present treatment is not working or when they have found new mets in the bones. I have been on IV Abraxane now since December and my markers where 109 and now they are 56 and my bone scans are stable. My oncologist is happy with that and she said they seem to be a good indication when there is a problem or not.,but she relies on the scans first .