I'm posting this list of tumor markers from the gov't. website. For some reason it doesn't list the CA 27-29 which many of our oncologists have done so might need updating. I read, in a British newspaper, that some British doctors are having the CEA done but am not familiar with it.

Have any of you had the Estrogen Receptot Assay done which purportedly tests how well anti-estrogen therapy will work for estrogen positive breast cancer?
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Tumor Markers (excerpt)

CA 15-3 (Cancer Antigen 15-3)
Elevated in 76%
of metastatic breast cancers.

CA-125 (Cancer Antigen-125)
A tumor marker useful for monitoring for ovarian cancer by measuring an antigen to epithelial neoplasms circulating in blood serum. Normal range: 0 - 35 U/mL. Normal range may vary somewhat according to institutional experience. Levels above 35 suggest the presence of ovarian tumor.

CEA (Carcinoembryonic Antigen)
A blood test measuring the presence of an antigen in malignancies arising in entodermal (embryonic) or gastrointestinal tissue. Persistent elevated levels indicate residual or recurrent metastatic carcinoma. CEA assay is nonspecific for identifying a primary site, but it does indicate the presence of malignancy. Smokers may have an elevated CEA without malignant disease.

Estrogen Receptor Assay (ERA)
A laboratory test of breast cancer tissue to determine the responsiveness of the tumor to endocrine therapy or to removal of the ovaries.
https://training.seer.cancer.gov/diagnostic/markers.html