Tumor marker expectations with fourth infusion of Herceptin and Perjeta

Can't help you, I'm afraid. When I got diagnosed with extensive mets in the spine in April last year, my tumour marker level was 12. I probably had those mets for some time but it was only when I started to get into considerable pain that more tests were done to find the cause. Up until then, the oncologist relied on blood tests only for my six month visits to determine how I was going and my tumour markers were always low. Even this time after radiation, chemo and three weekly Herceptin/Perjeta, they've gone from 12 to 11. Go figure!