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Hello, this is Dr K.. Answers are not medical advice and do not constitute a doctor/patient relationship. I look forward to helping you today.
No not necessarily It may be the tumorilytic effect of the chemo. That means it is killing the mets and releasing the cea into the bloodstream. There are quite a few articles on this online. Heres one of the easier ones to understand.
Is it your family member that has colon cancer?