Bust the myths about breast acupuncture and understand its true accuracy

When recommended by a doctor, many women immediately have various fears and doubts. How accurate is it? Will it lead to the spread of cancer cells? These concerns can cause patients to hesitate and even delay the perfect timing of diagnosis. In fact, breast aspiration biopsy is a mature diagnostic technique in modern medicine, according to statistics from the Hong Kong Hospital Authority, more than 15,000 women undergo this test every year, and about 85% of cases end with benign results. The accuracy of this test can reach 90-97% under ideal conditions, which is much higher than the initial screening of traditional breast ultrasound or mammography. However, there are still many misconceptions among the public about this technology, which requires detailed explanation and guidance from medical professionals. In this article, we will analyze in detail the real-world accuracy of breast acupuncture from a medical perspective, debunking common myths and helping women face this potentially life-saving test with a more scientific attitude.

When is breast aspiration necessary?

This is not a routine screening, but a diagnostic tool that is only needed if certain abnormal signs are found. The most common signs include a noticeable breast lump, especially a hard texture, unclear boundaries, and touching a lump that does not move. According to the Hong Kong Breast Cancer Foundation's 2022 clinical guidelines, breast needle tissue examination is highly recommended in the following three situations:

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• A lump was found in the breast: Needle harvesting should be performed as long as the mass found on self-examination or imaging meets the evaluation criteria of "BI-RADS level 4 or higher" (approximately 2-95% of the possibility of malignancy). It is important to note that not all lumps require needle extraction, and lumps less than 1 cm with apparently benign ultrasound features may only require regular follow-up.
• Nipple discharge: A spontaneous outflow of blood or clear fluid, especially from one nipple, may be a sign of intraductal papillomas or cancer. At this time, it is necessary to cooperate with the duct scope for positioning and needle removal, and the accuracy can reach more than 85%.
• Breast pain or other abnormalities: If it is accompanied by warning signs such as skin depressions, inverted nipples, breast deformity, swollen lymph nodes in the armpits, acupuncture should be considered even if the obvious lump is not palpable. According to a study by Queen Mary Hospital in Hong Kong, about 12% of patients with early-stage breast cancer showed only local structural distortion, and the diagnosis required stereotactic needle extraction.

Especially in modern times, three main techniques have been developed: fine needle aspiration (FNA), core needle aspiration (CNB), and vacuum-assisted sectioning (VAB). Among them, vacuum-assisted biopsy has become the preferred method in public hospitals in Hong Kong due to its ability to collect more tissue and its highest diagnostic accuracy for microcalcifications and atypical hyperplasia.

How accurate is a breast needle?

The accuracy of breast acupuncture is influenced by multiple factors, and diagnostic performance can vary significantly depending on the technique. According to a comparative study published by the Faculty of Medicine of the Chinese University of Hong Kong in 2023, the exact data for the three main needle extraction methods are as follows:

The main factors affecting accuracy include operator experience (23% higher accuracy for more than 50 cases per year), image guidance equipment (ultrasound and stereotactic), lesion location (accuracy is reduced by approximately 8% in deep lesions), and pathologist interpretive ability. According to the Hong Kong Breast Cancer Database, in medical centers equipped with advanced ultrasound and experienced radiologists, the overall accuracy of breast needle biopsy can reach 96.2%, which is not much different from the 99% accuracy of open surgical biopsy.

In particular, it should be noted that there are two levels of so-called "accuracy": sensitivity (the ability to correctly detect cancer cells) and specificity (the ability to correctly exclude non-cancer cells). The sensitivity of vacuum-assisted aspiration is slightly reduced to 98% for invasive breast cancer and 91% for carcinoma in situ, which explains why repeated sampling or additional surgical biopsies are required.產前身體檢查

Myths are often solved

Myth 1: Do needles spread cancer cells?

This is the most widely circulated myth that has no scientific basis at all. According to a large international study, there is no difference in 5-year survival between patients who underwent needle sampling and those who underwent direct surgery. The incidence of needle grafting (cancer cells spreading along the needle's path) is only about 0.007%, and most of these cells are removed by subsequent treatment. According to statistics from Hong Kong's top 10 hospitals, out of more than 80,000 needle extraction cases in the past decade, only 3 cases were suspected of needle channel metastasis, with an incidence rate of less than 4 per 100,000 people. The latest needle extraction technology adopts the "coaxial method", which first places a protective cannula and then takes multiple samples to completely isolate the needle path from the tumor, further reducing the risk.

Myth 2: Should the results of needle extraction be 100% accurate?

While the results of breast aspiration are highly beneficial, there are still limitations. Approximately 3-5% of cases may be "false negative" (actually cancer, but the test shows benignity) mainly due to bias in the sampling location (especially if the calcification points are unevenly distributed), inexperienced pathologists, or tumor features that make it difficult to identify cells (e.g., lobular carcinoma in situ). Therefore, a negative result should be compared with imaging tests, and if there is a high clinical suspicion of malignancy, further examination should be performed, even if the needle extraction result is benign. The Hong Kong Hospital Authority recommends that all patients with negative needle extraction but with BI-RADS grade 4 or higher imaging tests should be re-examined within 6 months.

Myth 3: Is needle removal painful and unbearable?

Most patients describe the needle extraction process as similar to a slight tingling sensation caused by blood or dental anesthesia. Due to the routine use of local anesthesia (lidocaine) in modern medicine, more than 90% of patients report a pain level of less than 3 out of 10. According to a questionnaire survey conducted by the Prince of Wales Hospital in Hong Kong, only 7% of patients think that pain is more pronounced, and most of these patients are particularly sensitive to pain or have deep lesions. Mild bruising (about 30% of cases) or swelling (about 15%) may appear after the examination, but it usually goes away on its own within 3-7 days. Technically, the thin 16G needle can reduce pain by 35% compared to the 14G needle, and the vacuum-assisted needle extraction surgery time is slightly longer, but the actual discomfort is lower due to continuous sampling and reduced repeated punctures.

How to interpret a needle pull report?

When receiving reports on breast acupuncture results, it is important to understand its grading system. The internationally recognized Bethesda system is divided into five main categories:

• B1: Normal tissue- Only adipose or fibrous tissue was obtained, no lesion cells were seen. It is necessary to check whether the sampling position is correct.
• B2: Benign lesions- Benign changes such as fibroadenomas and cysts are seen, with about 80% of cases being of this type. Regular follow-up is recommended.
• B3: Atypical Overformation- Cellular abnormalities are found, but they do not meet the criteria for cancer, and about 20-40% of subsequent surgeries are found to be latent. Surgical resection is required for confirmation.
• B4: Suspected malignancy- Cancer is suspected but poorly founded, accounting for about 85% of cases that are ultimately diagnosed. Surgical biopsy is required.
• B5: Diagnosed with malignancy- To definitively detect cancer cells, it is necessary to further differentiate between carcinoma in situ (B5a) and invasive carcinoma (B5b).

According to data from the Department of Pathology, Hong Kong Baptist Hospital, approximately 15% of B3 cases and nearly 100% of B4/B5 cases require surgical intervention. Of particular note are two B3 lesions, "atypical ductal hyperplasia" (ADH) and "lobular carcinoma in situ" (LCIS), which are not invasive cancers but are high-risk indicators of future cancer development and are usually recommended for extensive resection and annual MRI monitoring.

What should I do if the results of needle extraction do not match clinical judgment?

If the results of needle extraction do not coincide with imaging symptoms or clinical palpation, further confirmation will be required with a probability of 5-8%. The Hong Kong Breast Cancer Diagnosis and Treatment Guidelines clearly list three situations in which a second opinion should be sought.

1. Needle extraction results are benign, but images are highly questionable (BI-RADS grade 4C or 5)
2. The pathology report is B3 (atypical hyperplasia), but the lesion is >2 cm
3. Clinically, there is a noticeable lump on the palate, but only a small amount of tissue is extracted from the needle

The second opinion should include a reinterpretation of the biopsy by another senior pathologist (a free re-reading service provided by the Hong Kong Hospital Authority) and consideration of other diagnostic methods.

• Surgical biopsy: gold standard, almost 100% accurate, but invasive and scarring
• Contrast-enhanced breast MRI: Sensitivity up to 95% for multicentric lesions and high-density mammary glands, specificity about 70%
• Molecular Imaging: For example, PEM (positron emission wrist mammography) can detect metabolic activity and is therefore very valuable for preoperative evaluation.

It is worth noting that Pamela Yudo Nethersole Hospital in Hong Kong's Eastern District introduced "liquid biopsy" technology in 2022, which uses blood sampling to detect circulating tumor DNA and provide auxiliary judgments with up to 99% specificity for undiagnosed cases.

Look at breast acupuncture reasonably and actively cooperate with the doctor in the diagnosis

As a central tool in breast cancer diagnosis, breast needle biopsy is valuable in obtaining histological evidence with minimal trauma. Hong Kong medical data fully proves that this test is very accurate and safe under the operation of a professional medical team. The patient should understand that the result of needle removal is not a final verdict, but an important part of the diagnostic process - a negative result is confirmed by imaging follow-up, and a positive result should further differentiate the type and stage of cancer. Choosing an experienced medical institution (the annual number of cases of a "breast health center" certified by the Hong Kong Ministry of Health requires more than 200 cases), fully communicating your concerns to the doctor before surgery, and providing correct post-operative care (applying ice within 24 hours and avoiding strenuous exercise) can improve the examination experience and diagnostic effect. The most important thing is to maintain a positive attitude and cooperate with the diagnostic process to detect problems early and get the best treatment results.

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