Pathology of Breast Cancer
The pathology report turns a tissue sample into information that guides surgery, medicines, and radiotherapy.
The key things to know
- Grade and stage describe different things.
- Margins and biomarkers can change treatment.
- The full report matters more than one isolated phrase.
Type and invasion
A pathologist examines cells and tissue under a microscope to determine whether cancer is present and whether it is in situ or invasive. The report may describe ductal, lobular, or a less common pattern. A core biopsy samples a small area; the final surgical report can add information about the full extent. An unexpected difference does not necessarily mean the first test was wrong.
Grade is not stage
Grade describes how abnormal cancer cells look and how actively they appear to grow. Stage describes the extent of disease and incorporates other features. A high-grade small tumour is not automatically an advanced-stage cancer. The report may also mention lymphovascular invasion, meaning cells were seen in small blood or lymph vessels; this finding is considered with other risk information.
Margins, nodes, and receptors
After surgery, margins describe whether cancer reaches the cut edge of removed tissue. Further surgery may be needed if margins are involved. Node reports indicate whether cancer was found and the size of deposits. ER, PR, and HER2 results help select systemic therapy. Some tests need a second laboratory method or specialist interpretation before a result is final.
Using your report
Request a copy and ask the team to explain the features that change treatment. A single phrase should not be read as a full prognosis. If treatment was given before surgery, the report also describes response and any residual disease. Specialist pathology review may be useful for unusual or uncertain findings. Keep biopsy and surgery reports together for future consultations.
Take these questions to your appointment
- Are my margins clear?
- What are my receptor results, and are any tests still pending?
Sources & review
This is original educational content based on the sources below, not reproduced textbook material. Website supervisor: Dr. Nizar Ismail. Individual medical review of this article is pending.
- NCI: How Is Breast Cancer Diagnosed? ↗
- NCI: Tests for Breast Cancer Biomarkers ↗
- NCI: Breast Cancer Stages ↗
This information cannot replace diagnosis or a personal treatment plan. Consult your care team about symptoms or decisions about your treatment.
