https://www.mayoclinic.org/tests-procedures/breast-biopsy/about/pac-20384812

For pathologists, a high-quality pathological report depends on a high-quality biopsy tissue sample. The breast biopsy needle sampling technique is not only a technical method for obtaining tissue, but also a rigorous quality control system. Every step of this process directly affects the accuracy of the final diagnosis, and thus influences the fate of the patient.

I. The "Quality" of the Sample: Completeness is the Gold Standard for Diagnosis

The core goal of core needle biopsy is to obtain a complete and undamaged tissue strip. An ideal biopsy tissue should be cylindrical in shape, of sufficient length, and contain the complete tissue structure, such as normal breast lobules, ducts, and the lesion area. If the tissue is too fragmented, severely compressed, or merely a blood clot, it will be difficult for the pathologist to determine the arrangement of cells, the infiltration situation, and the relationship with the surrounding matrix. This may even lead to a false negative diagnosis. Therefore, the operating doctor needs to select a biopsy needle of the appropriate diameter and maintain stable negative pressure after firing, and gently remove the sample.

II. "Quantity" of the Sample: Meeting the Requirements of Multi-Faceted Analysis

Modern pathological diagnosis has gone beyond merely distinguishing between benign and malignant conditions. For breast cancer, we need to know its molecular classification (Luminal A/B, HER2 positive, triple-negative, etc.), proliferation index (Ki-67), and whether genetic testing is necessary. This means that the tissue obtained from a biopsy needle not only needs to be sufficient for routine HE staining, but also requires enough wax blocks for immunohistochemistry and fluorescence in situ hybridization. Therefore, clinical guidelines usually recommend obtaining at least 3-5 satisfactory tissue cores. For tumors with significant heterogeneity, even more sampling points may be required to ensure that the samples can represent the characteristics of the entire tumor.

III. The Perfect Loop of Imaging and Pathology: Confirming the Hit on the Target Point

This is the most crucial step in quality control. After the biopsy is completed, the operating doctor must immediately conduct an imaging examination on the extracted tissue strips. If it is a case of calcification, the tissue strips need to be placed on an X-ray plate for photography to confirm that they do indeed contain calcification points; if it is an ultrasound-visible mass, the tissue strips need to be placed in physiological saline and then examined using ultrasound to confirm that their echo characteristics are consistent with the lesion. Only samples that have been confirmed through imaging can be regarded as valid samples. This step can effectively prevent "missed diagnoses" caused by puncture deviations and is the last line of defense against missed diagnoses.

IV. Pre-Treatment of Specimens: The Art of Fixation and Transportation

Tissues removed from the body will undergo rapid autolysis, so timely and accurate fixation is of utmost importance. After the biopsy tissue is taken out, it should be immediately placed in an adequate amount of 10% neutral buffered formalin solution for fixation. The volume of the fixative should be more than 10 times that of the tissue to ensure thorough penetration. The fixation time usually requires 6 to 48 hours, and either too short or too long will affect the subsequent immunohistochemical results. In addition, the specimen bottle must clearly indicate the patient's name, case number, puncture site, and needle number, and be sent to the pathology department as soon as possible.

V. Feedback from Pathologists: Driving Continuous Improvement of Technologies

An excellent pathologist is not only a reader of slides but also a supervisor of clinical procedures. They will provide detailed descriptions of the quality of the samples (such as whether they are complete, whether there is compression, and whether there is calcification) in the report, and offer feedback on the clinical procedures. For instance, if they receive repeatedly broken samples, they will suggest changing to a larger-caliber biopsy needle or adjusting the puncture technique. This benign interactive cycle enables the overall quality of breast biopsy needle sampling to be continuously improved.

Summary

A precise biopsy needle is just the beginning. From obtaining complete tissue, ensuring sufficient quantity, confirming the target hit, to standardized fixation and transportation, as well as effective communication between pathology and clinical departments, every step is an indispensable part of a high-quality breast biopsy sampling procedure. It is this ultimate pursuit of quality that gives pathologic diagnosis its undeniable authority.