A Guide To Breast Biopsy: How It Determines A Personalised Treatment

A biopsy is the crucial first step towards planning precision cancer medicine: a modern approach to cancer care that moves beyond ‘one treatment for everyone’ to a plan centred on an individual’s unique biology. 

No two breast cancers are the same. Two patients with tumours of identical size may have entirely different cancer subtypes, one driven by hormones, another by a specific protein, and a third carrying a hereditary genetic mutation. Hence, each demands a fundamentally different treatment strategy, making personalisation critical.

This article guides you through why a biopsy is essential, what to expect during the procedure, and how the results directly shape a treatment plan tailored to your unique biology.

The only way to know which subtype you have is to examine the tissue itself. A biopsy provides that tissue. From the tissue, your medical team can determine:

• Whether your cancer is fuelled by the hormones oestrogen or progesterone (ER/PR positive), which means hormone-blocking therapies like tamoxifen or aromatase inhibitors may be highly effective.
• Whether it overexpresses the HER2 protein, which opens the door to targeted therapies such as trastuzumab that specifically seek and attack HER2-positive cells, leaving healthy tissue largely unaffected.
• Whether it is triple-negative, meaning it lacks all three receptors and requires a different approach, often chemotherapy or newer immunotherapy options.
• Whether a hereditary mutation such as BRCA1 or BRCA2 is present, which can influence surgical decisions and flag risk for close family members.

If your biopsy confirms a malignant lump, this is where the results do far more than deliver a yes-or-no answer. As explored in our earlier article on benign and malignant lumps, a malignant tumour is not a single, uniform thing. Malignant cells vary in how they grow, how aggressively they behave, and, critically, what drives them. This is what precision care looks like in practice: your pathology report becomes the blueprint. Your oncologist reads it not just to confirm a diagnosis, but to understand the biological behaviour of your specific cancer and to select therapies proven to work against exactly that subtype.

A biopsy, then, is not merely a confirmation. It is the gateway to a treatment journey designed uniquely for you.

Why are Imaging tests alone not enough?

A mammogram or ultrasound is excellent at finding a suspicious area, but it can only show a shadow or outline. It cannot tell your doctor why cells are behaving differently, or what type of cells they are. Only a tissue sample examined under a microscope can answer that. A biopsy is the only way to get a definitive diagnosis and, more importantly, the molecular information your doctors need to plan the right treatment.

Understanding Invasiveness in Biopsies

Before examining the various types of biopsies, it is important to understand a term that doctors frequently use: invasive. Simply put, invasiveness refers to how much a medical procedure penetrates your body. You can think of it on a scale:

Non-invasive: These tests stay on the outside of your body. A mammogram or an ultrasound is non-invasive because nothing enters through the skin.

Minimally invasive: These tests use a very small entry point. A needle biopsy is minimally invasive because it only uses a tiny needle to take a sample. It leaves no scar and usually does not need stitches.

Invasive: This refers to surgery. It requires a larger incision so the doctor can remove a piece of tissue or a whole lump, and it requires more healing time.

The goal of modern medicine is to be as least invasive as possible. Doctors want to get the answers they need while causing the least amount of disruption to your body.

Types Of Breast Biopsy

There are two main types of breast biopsy: surgical and needle.

A surgical breast biopsy is performed by a surgeon in an operation theatre (OT). It involves making an incision (a small cut) in the skin to remove part or all of a lump. This approach is typically used only when needle biopsies cannot support decision-making or are not possible.

There are two types:

• Incisional biopsy removes only a portion of the lump or suspicious area for examination. This is used when the lump is too large to remove entirely or when the doctor needs a sample before deciding on further treatment.
• Excision biopsy (also called surgical excision biopsy) removes the entire lump along with a small margin of surrounding healthy tissue. It serves as both a diagnostic and potentially therapeutic procedure, meaning it may treat the condition while diagnosing it. This is often used for lumps that are small enough to remove completely, or when needle biopsies have not provided a conclusive result.

A needle biopsy is performed by a radiologist in an examination room or radiology suite. It involves inserting a needle through the skin to collect a tissue sample, without requiring an incision. This is the preferred first approach in most cases because it is quicker, less disruptive to the body, and allows the patient to go home the same day.

There are two main subtypes of needle biopsy:

• Fine Needle Aspiration Cytology (FNAC) uses a thin, hollow needle attached to a syringe to draw out fluid or loose cells. It is simple and quick, but it collects only individual cells rather than intact tissue, which limits the molecular information it can provide.
• Core needle biopsy uses a larger needle to remove a small, tube-shaped cylinder of tissue using either a spring-loaded device or a vacuum-assisted device. Because it preserves tissue structure, it gives the pathologist far more to work with and is the preferred method for comprehensive molecular and genomic testing.

The Gold Standard: Core Needle Biopsy

Although there are several types of biopsies, the core needle biopsy is the preferred choice for precision oncology. Unlike a Fine Needle Aspiration Cytology (FNAC), which only collects individual loose cells, a core biopsy removes a small cylinder of intact tissue. This tissue architecture is what makes the following tests possible:

• Receptor testing (ER/PR): Determines whether the cancer is driven by oestrogen or progesterone. This directly guides whether hormone therapy will work.
• HER2 (IHC/FISH) testing: Identifies overexpression of the HER2 protein, opening the door to targeted therapies like trastuzumab.
• Germline analysis: Checks for hereditary gene mutations (such as BRCA1/2) that may change your treatment plan and inform risk for family members.

Comparison of biopsy methods: 

Why The Type Of Biopsy Matters

Because every person’s body and every breast lump is different, doctors must choose the right tool for the job. Knowing the type of biopsy you are having is important for three reasons:

• The details of the sample: Some biopsies take only a few cells (fine-needle), while others take a small “core” of tissue. A core needle biopsy is very common because it preserves tissue structure, which helps the laboratory provide a much more accurate diagnosis.
• Finding the right target: Doctors use different approaches to locate the area to biopsy.
  * Ultrasound-guided biopsy is used if the doctor can feel the lump or see it clearly on an ultrasound.
  * Stereotactic (mammogram-guided) biopsy is used for tiny calcium spots that only show up on a mammogram.
  * MRI-guided biopsy is used if the area is only visible on an MRI scan.
• Recovery time: A minimally invasive needle biopsy allows you to go home immediately and return to work the next day. A surgical biopsy may require a longer rest period.

Liquid Biopsy: A New Frontier

While traditional tissue biopsies remain the gold standard for diagnosis and molecular profiling, a new technique called liquid biopsy is gaining prominence. . 

Liquid biopsy involves a simple blood draw to analyse fragments of tumour DNA (circulating tumour DNA or ctDNA), cancer cells, or other biomarkers (proteins such as CA 15-3 or CEA that are associated with breast cancer activity) released by the tumour into the bloodstream.

Why is liquid biopsy important?

• Minimally invasive: It only requires blood, reducing the need for repeated tissue sampling, especially in hard-to-reach tumours or when surgery is risky.
• Real-time monitoring: Liquid biopsies can track changes in tumour genetics over time, helping doctors detect treatment resistance or recurrence even before symptoms arise.
• Personalised therapy: By revealing new mutations as cancer evolves, liquid biopsy can guide adjustments to targeted therapies, making treatment more dynamic and precise.
• Broader accessibility: For patients unable to undergo a traditional biopsy due to medical reasons, liquid biopsy offers a safe alternative.

Liquid biopsy is not yet a replacement for tissue biopsy, as it may not detect all mutations and is still being validated for certain cancers. However, it is an exciting advancement that is already influencing cancer care protocols, including in leading Indian cancer centres.

What Actually Happens During A Biopsy?

A breast biopsy is typically an outpatient  (OP) procedure lasting 20 to 45 minutes, performed in a radiology suite or day-care hospital. Here is what you can expect, step by step:

• Numbing the area: The skin is cleaned, and a local anaesthetic is injected. You will feel a tiny prick, similar to a blood test, and the area becomes numb within a minute.
• Guided precision: Using live ultrasound or mammography, the doctor navigates the needle to the exact spot of concern. You will not need to stay perfectly still or hold your breath.
• Collecting the sample: You may feel a mild pressure or tugging, but no sharp pain. If a core needle biopsy is performed, you may hear a small clicking sound. This is completely normal.
• Placing a marker clip: A tiny metal clip, smaller than a grain of rice, is often left at the biopsy site. It is permanent and harmless, helping surgeons locate the exact spot if further treatment is needed.

Biopsy Aftercare 

Aftercare varies depending on the type of biopsy you had.

After a needle biopsy (FNAC or core needle):

You will go home the same day with a small bandage and an ice pack. Keep the biopsy site dry and clean for at least 24 hours to prevent infection, which is especially important in India’s warm and humid climate. Avoid heavy physical activity for the rest of the day. Most patients return to normal routine the following day. Results are typically available within 3 to 5 working days, as the laboratory must perform detailed molecular staining to provide your full biological profile.

After a surgical biopsy:

Surgical biopsy is performed under local or general anaesthesia and involves a small incision (a small cut), so recovery takes longer. You may have stitches that need to be kept dry and clean for several days. Some swelling, bruising, and tenderness around the site are normal and can last up to two weeks. Your doctor will advise you on wound care, when to bathe normally, and when to return for a follow-up. Heavy lifting and strenuous activity should be avoided for at least one to two weeks. Results from a surgical biopsy typically take 5 to 7 working days, as the larger tissue sample requires more extensive laboratory processing, including additional staining and molecular testing.

In both cases, contact your doctor promptly if you notice increasing pain, redness, swelling, or any discharge from the biopsy site, as these may be signs of infection.

Important Points For Patients

• A biopsy is not a cancer diagnosis: About 80% of breast biopsies are found to be benign (not cancer). It is simply a way to get a definitive answer.
• The procedure is quick: Most biopsies are done in less than an hour. You are awake, but the area is numbed with local anaesthesia so you do not feel pain.
• The marker clip: Doctors often leave a tiny, safe metal clip at the site. This marks the spot for future check-ups so doctors know exactly where the sample was taken.
• The wait: It usually takes 3 to 5 working days to get your results. It is normal to feel anxious during this time.
• Doctors always try to use the least invasive method first. By using a needle instead of surgery, they can get a highly accurate diagnosis with a faster recovery and less stress for you.

What Does A Pathologist Do With A Tissue Sample?

Once the biopsy is complete, the tissue sample leaves the procedure room and enters the laboratory, where a pathologist takes over. A pathologist is a specialist doctor who studies tissue, cells, and body fluids under a microscope to understand what is happening at a biological level. They do not treat patients directly, but their report is what every treatment decision is built on.

Here is what happens to your sample, step by step:

1. Receiving and labelling: The tissue arrives in a small container of preserving fluid called formalin. It is logged, labelled, and assigned a unique identification number to ensure no samples are ever mixed up.
2. Processing and embedding: The tissue is processed overnight to remove water and replace it with paraffin wax. This hardens the sample so it can be sliced into extremely thin sections, sometimes as thin as one hundredth of a human hair.
3. Staining: The thin slices are mounted on glass slides and stained with dyes. The most common stain, called H&E (haematoxylin and eosin), colours different parts of the cell in contrasting shades, making structures visible under the microscope. Without staining, tissue is essentially transparent.
4. Microscopic examination: The pathologist carefully studies the slides to assess the shape, size, and arrangement of cells. They are looking for signs of abnormal growth, irregular cell boundaries, and differences in how cells compare with nearby normal, healthy tissue.
5. Receptor and molecular testing: For breast tissue specifically, additional tests are run beyond the basic microscopy. These include immunohistochemistry (IHC), which uses antibodies to detect oestrogen receptor (ER), progesterone receptor (PR), and HER2 proteins on cancer cells. These results directly determine which treatments will work for your specific cancer.
6. Grading: The pathologist assigns a grade to the cancer based on how different the cells look from normal cells.
   Grade 1 cells look relatively normal and tend to grow slowly.
   Grade 3 cells look very abnormal and tend to be more aggressive.
   This grading helps your oncologist understand how urgent and intensive the treatment needs to be.
7. The final pathology report: Everything the pathologist finds is compiled into a detailed written report. This report lands on your oncologist’s desk and becomes the foundation of your entire treatment plan.

What Indian Guidelines Do The Doctors Follow? 

In India, doctors follow specific national guidelines and protocols to ensure evidence-based, standardised, and high-quality cancer care. Key sources include:

Indian Council of Medical Research (ICMR): Publishes comprehensive guidelines for cancer diagnosis, biopsy, and treatment. Their Consensus Document for Management of Breast Cancer is widely used in clinical practice.

National Cancer Grid (NCG): A network of leading cancer centres in India, the NCG develops and updates standardised guidelines for cancer care, including biopsy protocols, staging, and treatment pathways tailored to the Indian context.

National Medical Commission and State Medical Councils: Set ethical and clinical standards for registered practitioners.

Doctors may also refer to international guidelines such as NCCN, ESMO, or ASCO, adapting them to Indian patients and local resource availability. ICMR and NCG protocols detail when and how to perform biopsies, preferred techniques, tissue handling, and reporting standards. Adherence to these guidelines ensures patient safety, diagnostic accuracy, and optimal treatment planning.

FREQUENTLY ASKED QUESTIONS

Will the biopsy be painful? 

Most patients describe feeling pressure or mild tugging during the procedure, but not sharp pain. The local anaesthetic effectively numbs the area. Some soreness or bruising around the site may persist for a day or two afterwards. Pain killers like paracetamol are usually sufficient.

Can I eat and drink normally before my biopsy? 

Yes. Because a breast biopsy uses only local anaesthesia (not general anaesthesia), you can eat and drink normally beforehand. Your doctor will confirm this at your pre-procedure consultation.

How long will it take to get my results? 

Results typically take 5 to 7 working days. The laboratory performs multiple chemical staining processes on the tissue to produce your full molecular profile. This careful analysis takes time and should not be rushed.

Will I need someone to drive me home? 

Because only a local anaesthetic is used, most patients feel perfectly fine to travel home independently. However, it is always a good idea to take along a family member or friend for emotional support, especially if you are feeling anxious.

Is the metal marker clip safe? Will it set off airport security? 

The clip is made of surgical-grade, non-magnetic material and is completely harmless. It does not set off airport metal detectors, cannot be felt beneath the skin, and does not interfere with future MRI scans. It simply helps your surgeon find the exact location if follow-up treatment is needed.

What if I am on blood-thinning medication? 

Inform your doctor before the procedure if you take aspirin, warfarin, clopidogrel, or any other blood-thinning medication. Your medical team will advise whether to pause it temporarily and for how long. Do not stop any medication without their guidance.

Can a biopsy be performed during pregnancy? 

Yes, a breast biopsy can be performed safely during pregnancy. A new or suspicious breast lump discovered during pregnancy should never be ignored or deferred until after delivery, as early detection remains just as important. Core needle biopsy is the preferred method during pregnancy as it is minimally invasive and does not require general anaesthesia. Local anaesthesia, which numbs only the area being biopsied, is considered safe for both the mother and the baby.
Ultrasound guidance is typically used instead of mammography to avoid any radiation exposure to the foetus. If a surgical biopsy is absolutely necessary, it can be performed under careful anaesthetic management, with the timing planned in coordination with your obstetrician and surgical team. The key message is this: do not delay getting a lump checked because you are pregnant. Inform your doctor immediately, and let them guide you on the safest next step for you and your baby.

REFERENCES

Indian Council of Medical Research (ICMR). Consensus Document for Management of Breast Cancer (Updated 2023). Available at: https://main.icmr.nic.in

National Cancer Grid (NCG). NCG Guidelines for Breast Cancer (2024). Available at: https://tmc.gov.in/ncg

National Medical Commission (NMC). Professional Conduct, Etiquette and Ethics Regulations (2023).

NCCN: Guidelines for Breast Cancer Screening and Diagnosis.

American Cancer Society: Breast Biopsy, What to Expect.

Journal of Clinical Oncology: Safety and Efficacy of Percutaneous Breast Biopsy in Clinical Practice.

European Society for Medical Oncology (ESMO) Clinical Practice Guidelines.

All India Institute of Medical Sciences (AIIMS). Protocols and Guidance for Breast Cancer Management.

Tata Memorial Centre (TMC), Mumbai. Breast Cancer Guidelines and Patient Resources.

Indian Society of Medical and Paediatric Oncology (ISMPO) Recommendations.

Medical disclaimer: This article is for general educational purposes only and does not constitute medical advice. Guidelines vary by centre, patient profile, and resource availability. Always consult a qualified oncologist or breast cancer specialist for individual guidance.

Karkinos Healthcare

media@karkinos.in