Hello and thank you for your post. 

Yes, this is usually seen as a positive sign that things are going in the right direction. The CEA is a protein that is classed as a tumour marker and can help indicate how a cancer is responding to treatment.

So if the level of CEA has reduced while someone is having chemotherapy it usually indicates that the treatment is working for now. The other way to see how a cancer is responding to treatment is to do a scan after they have had a few sessions of treatment. 

Please get back to us if you need any more information or support.  You may find it helpful to talk things through with one of the nurses on our helpline.  The number to call is Freephone 0808 800 4040 and the lines are open from 9am till 5pm Monday to Friday.

Take care,

Caroline