Clinical Practice Guidelines for Visualized Percutaneous Breast Tissue Clips: What the 2021 CSBrS Guidelines Mean for Breast Care
Breast cancer screening has become more widespread globally, and with it, an increasing number of nonpalpable breast lesions—abnormal spots that cannot be felt by hand—are being detected. For doctors, precisely locating these lesions during surgery or follow-up is critical to successful treatment. Enter breast tissue clips: tiny, imaging-visible markers that label suspicious areas in the breast or underarm (axillary) lymph nodes. To standardize how these clips are used safely and effectively, the Chinese Society of Breast Surgery (CSBrS) released a 2021 clinical practice guideline. Here’s a breakdown of what it covers—and why it matters.
What Are Breast Tissue Clips?
Breast tissue clips are small, biocompatible markers that show up clearly on ultrasound (US), mammogram (MMG), or MRI. They are placed under imaging guidance (usually ultrasound or X-ray) to mark the exact location of:
- A nonpalpable suspicious breast lesion (e.g., a small tumor or calcification found on a mammogram).
- A metastatic axillary lymph node (a lymph node under the arm where cancer has spread, confirmed by biopsy).
The goal? To help surgeons find and remove the right tissue during procedures like breast-conserving surgery (removing the tumor without the entire breast) or targeted axillary dissection (TAD)—a less invasive alternative to full lymph node removal.
Why Did the CSBrS Create These Guidelines?
Without clear rules, using breast tissue clips can be inconsistent. The CSBrS reviewed medical evidence using the GRADE system (a gold-standard tool for evaluating the strength of medical recommendations) and considered real-world accessibility in China to create guidelines that balance science and practicality. The panel included 78 experts—83% breast surgeons, plus oncologists, radiologists, pathologists, and epidemiologists—ensuring the guidelines reflect input from multiple specialties.
Key Recommendations: When to Use Breast Tissue Clips
The guidelines outline four main scenarios where clips are recommended for patients in China:
1. Non-Palpable Suspicious Breast Lesions
If a patient has a nonpalpable lesion that needs a surgical biopsy (e.g., a suspicious spot on a mammogram), clipping the area helps doctors locate it during the procedure. This avoids unnecessary tissue removal and improves follow-up.
2. Non-Palpable Breast Cancer for Breast-Conserving Surgery
Breast-conserving surgery requires removing the entire tumor with clear margins (no cancer left at the edge of the tissue). For nonpalpable cancers, clips boost the negative margin rate (the percentage of surgeries with clear margins) to 90% and reduce the need for repeat surgeries.
3. Breast Cancer Patients Undergoing Neoadjuvant Therapy
Neoadjuvant therapy (chemotherapy or targeted therapy before surgery) can shrink tumors—sometimes so much that the original site is hard to find. Clipping the tumor before therapy helps surgeons locate residual cancer during surgery. Studies show this lowers the 5-year local recurrence rate and improves surgical outcomes.
4. Metastatic Axillary Lymph Nodes Before Neoadjuvant Therapy
If a patient has pathologically confirmed metastatic axillary lymph nodes (pN1), clipping the node before neoadjuvant therapy enables targeted axillary dissection (TAD) later. TAD removes only the sentinel node (the first node cancer spreads to) and the clipped node—instead of all underarm nodes. Trials like ACOSOG Z1071, MARI, and ILINA confirm this is accurate (false negative rate: 2–7%) and cuts the risk of postoperative arm lymphedema (swelling) by reducing tissue damage.
How to Place Clips Safely and Effectively
The guidelines also address practical questions about using clips:
Imaging Guidance: Ultrasound Is Preferred
Ultrasound-guided clip placement is more accurate than X-ray (fewer misplaced clips) and is the CSBrS’s top choice. X-ray is an option if ultrasound isn’t feasible (e.g., the lesion is only visible on mammogram).
Number of Clips: One Per Lesion
The panel recommends one clip per primary breast lesion or metastatic lymph node. Using more clips doesn’t improve accuracy but increases cost—so one is enough.
Avoiding Clip Loss
Clips are tiny, so 5–20% of the time, they may move or get lost during surgery. To prevent this:
- Use guide wires or dyes (e.g., activated charcoal) to mark the clip’s location before surgery.
- If available, isotopic tracers (radioactive markers) are another effective option.
- After removing tissue, use intraoperative radiography (X-ray) to confirm the clip is present in the specimen.
Timing: Place Clips Before Neoadjuvant Therapy
For primary breast cancer or metastatic lymph nodes, clips should be placed before neoadjuvant therapy starts. Delaying placement until after 2 cycles of therapy may offer minor cost savings, but more research is needed. For lymph nodes, early clipping is critical—studies confirm it’s the only way to enable TAD later.
When NOT to Use Clips
The guidelines list clear contraindications for US or mammogram-guided clip placement:
- Severe systemic disease (e.g., heart failure) that makes the procedure unsafe.
- Psychiatric disorders or inability to cooperate.
- Bleeding or coagulation disorders (risk of hematoma).
- Active breast infection or a breast implant near the lesion (risk of complications).
Important Caveats
These guidelines are for breast disease specialists in China—they are not a substitute for personalized medical judgment. Every patient is unique, and doctors should adjust recommendations based on individual needs. The CSBrS also notes:
- The guidelines do not address patient or non-specialist use.
- They are not meant to resolve medical disputes or be used for insurance evaluations.
- The CSBrS reserves the right to update the guidelines as new evidence emerges.
For More Details
The full technical guidelines for clip placement are available in the CSBrS appendix: http://links.lww.com/CM9/A624.
Original Study Citation
Chen WZ, Jiang JX, Sun SS, Yu XY, Huang J, Chinese Society of Breast Surgery. Clinical Practice Guidelines for Visualized Percutaneous Breast Tissue Clips: Chinese Society of Breast Surgery (CSBrS) Practice Guideline 2021. Chinese Medical Journal 2021;134(15):1768–1770. doi: https://doi.org/10.1097/CM9.0000000000001585
These guidelines represent a step forward in standardizing breast care in China—offering clarity for doctors and better outcomes for patients. For anyone interested in breast cancer treatment, they highlight the power of small tools to make big differences in care.
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