Breast cancer tumor markers up?

I am 3 years out from my Breast Cancer diagnosis. i received Chemo, radiation and double mastectomy. My tumor markers are climbing from 39 last Sept 09 to 45 in Mar 2010 and now at 55 in Sept 2010. I had a PET scan (my first) in Feb 2010 which was clean. What would cause a increase in my markers besides my cancer... show more I am 3 years out from my Breast Cancer diagnosis. i received Chemo, radiation and double mastectomy.
My tumor markers are climbing from 39 last Sept 09 to 45 in Mar 2010 and now at 55 in Sept 2010.
I had a PET scan (my first) in Feb 2010 which was clean. What would cause a increase in my markers besides my cancer returning?
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