Ca 27-29 for early breast cancer

Hello everyone,

I am scared about my last Ca 27-29 resukts for early breast cancer, and would like to hear your experience with this marker.

This month, the result measured at Quest lab by my doctor was 51 U/ml (upper normal limit 38). The same day I also had it tested at Quest independently (as I thought my doctor didn’t order it) and the result was 40 U/ml, still a little high, but better (same day, different blood sample).

Last month it was 38. Before that, we used to measure the Ca 15-3, and while it had gone from 24 to 28 lately, it also went back to 25 last month. This month my doctor has not ordered the ca 15-3.

I am very scared. I was diagnosed a year ago with er+pr+Her2-, low oncotype (10), low Ki-67 (4%) multi focal breast cancer with biggest focus 8 mm, one involved lymph node. I am currently on Lupron, exemestane and Kisqali. Given the low oncotype I thought, if I had to have a recurrence along the way, it would be in many years. I can’t stop thinking that I have distant metastasis now, and it’s Saturday today, so there’s no one to talk to. Please share your experience, thank you very much