What can be learned from the biopsy results?
Once the biopsy is complete, a specially trained doctor called a pathologist examines the tissue or fluid samples under a microscope, looking for abnormal or cancerous cells. The pathology report, which can take one or two weeks to complete, is sent to the patient’s doctor. It indicates whether the suspicious area is cancerous and provides a full picture of your situation. For the patient, waiting for results can be a real challenge, but being able to make an informed decision regarding your treatment is well worth it. Your doctor will go over the report with you and, if necessary, discuss the treatment options.
If no cancer cells are found, the report will indicate that the cells in the lump are benign, meaning non-cancerous. However, some type of follow-up or treatment may still be needed, as recommended by the healthcare professional.
If cancer cells are found, the report will provide more information to help determine the next steps.
The report for a core-needle biopsy sample will include tumor type and the tumor’s growth rate or grade. If cancer is found, the pathologist will also perform lab tests to look at cells for estrogen or progesterone receptors.
In the case of a surgical biopsy, the results reveal data about the type, grade, and receptor status of the tumor, as well as the distance between the surrounding normal tissue and the excised tumor. The margin, as we mentioned earlier, shows whether the site is clear of cancer cells.
A positive margin means cancer cells are present at the margin of the tumor. In cases of positive margins, the cancer has spread beyond the immediate area.
A negative margin or clear margin indicates there are no tumor cells at the margin. That means the cancer is contained in the area nearest to the tumor.
A close margin means that the space between the cancerous tissue and surrounding normal tissue is less than about 3 millimeters (0.118 inch).
If you have a biopsy resulting in a cancer diagnosis, the pathology report will help you and your doctor talk about the next steps. You will likely be referred to a breast cancer specialist, and you may need more scans, lab tests, or surgery. Your medical team uses the pathology report and the results of the other tests to determine the stage of cancer and to design the best treatment plan for you.