Oestrogen receptor immunohistochemistry explained

A pathologist uses a tissue sample, usually from a biopsy or surgery, and applies a laboratory stain that attaches to oestrogen receptors. The stained sample is examined under a microscope. The report may describe the result as positive, negative or low, and may include the proportion of stained cells and staining strength. These details help the cancer team judge whether endocrine treatment could be useful.

The test does not measure the amount of oestrogen in your blood, and it does not by itself describe the whole cancer. Doctors interpret it with the tumour type, grade, progesterone-receptor result, HER2 result, scans and your health. A result can occasionally need review if the sample is small, damaged or technically difficult to interpret.

Ask for a copy of the pathology report and ask the team to explain every term in it. Confirm which tissue was tested and whether another sample is needed. Discuss how the receptor result affects surgery, chemotherapy, radiotherapy or hormone therapy. If endocrine treatment is offered, ask about its purpose, expected side effects, interactions and follow-up. Keep the report with your medical records when seeking another opinion.

The test itself does not usually cause symptoms beyond those related to collecting the tissue. Contact the biopsy service for increasing redness, swelling, warmth, drainage, bleeding or fever at the sampling site. Seek urgent help for heavy bleeding, severe breathing difficulty, fainting or rapidly worsening illness after a procedure. For questions about a delayed or unclear report, contact the clinic rather than interpreting a single result alone.

What was the oestrogen-receptor result and how was it measured? Was the sample adequate? Do I need other receptor tests or a repeat review? How does this finding change my treatment choices? Who can explain the pathology report if I have further questions?