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Breast biopsy

Core Biopsy vs FNAC — for a Breast Lump

If you have been referred for a biopsy of a breast lump, your doctor will almost certainly recommend a core biopsy rather than FNAC. Only core biopsy produces a tissue sample that can be tested for the markers needed to guide treatment if cancer is found.

Medically reviewed by Dr. C. Raghavendra Reddy, Medical Oncologist, MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Last reviewed September 2026

  • Core biopsy is now the standard — Most breast lump assessments in India now use core biopsy as the first tissue test, not FNAC.
  • FNAC cannot give receptor results — Fine needle aspiration draws out cells but cannot preserve enough tissue to test for ER, PR or HER2.
  • The procedure takes about 20 minutes — Local anaesthetic is used throughout; most people describe it as pressure, not pain.
  • Most lumps are benign — A biopsy is the only way to be certain, but the large majority of breast lumps investigated are not cancer.
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Core biopsy is now the standard first test for a breast lump in most situations. Unlike FNAC, it removes a small cylinder of tissue that can be tested for oestrogen receptor, progesterone receptor and HER2 markers — information your team needs to plan treatment if cancer is found. FNAC is occasionally still used but cannot provide these results.

What happens during a core biopsy?

  1. Local anaesthetic

    You lie on an examination couch and the skin over the lump is cleaned. A small injection of local anaesthetic is given. You will feel a brief sting; the area becomes numb within a minute or two.

  2. Ultrasound guidance

    The radiologist uses an ultrasound probe to locate the lump and guide the needle to the right spot. This is what makes the test precise and avoids surrounding tissue.

  3. The sample

    A spring-loaded needle passes through the skin and removes a thin cylinder of tissue — roughly the width of a pencil lead. You may hear a click. Most people feel pressure but not pain.

  4. Repeat passes

    Two to four samples are usually taken to ensure there is enough tissue for all laboratory tests, including receptor testing.

  5. Dressing and discharge

    A small dressing is applied and you go home the same day. The whole procedure usually takes about twenty minutes.

What do I need to do before and after my biopsy?

  • Tell your team about any blood-thinning medicines, including aspirin, before your appointment.
  • You can eat and drink normally on the day — no fasting is needed for most core biopsies.
  • Wear a comfortable, supportive bra; it helps reduce bruising afterwards.
  • Expect mild bruising and tenderness at the site for a few days. This is normal.
  • Avoid heavy lifting or strenuous exercise for 24 to 48 hours.
  • Keep the dressing dry for the first 24 hours.
  • Call your team if you notice increasing pain, redness or any discharge from the site.

What do these terms mean?

FNAC
Fine needle aspiration cytology. A thin needle draws out individual cells from the lump. It can show whether cells look abnormal but cannot preserve the tissue structure needed for receptor testing.
Core biopsy
A wider needle removes a small cylinder of tissue. Preserving the tissue architecture is what makes ER, PR and HER2 testing possible.
ER and PR
Oestrogen receptor and progesterone receptor. Positive results mean the cancer is driven by hormones and hormone-blocking treatment is likely to be part of the plan.
HER2
A protein that some breast cancers produce in large amounts. Your HER2 status determines whether certain targeted therapies apply to you.
Receptor status
The combined ER, PR and HER2 result. It is one of the most important pieces of information for deciding what breast cancer treatment to use.

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Why do most doctors now recommend core biopsy over FNAC?

Core biopsy replaced FNAC because FNAC cannot produce the tissue needed for ER, PR and HER2 testing — the three markers that now determine how breast cancer is treated.

FNAC uses a thin needle to draw out individual cells. Those cells can show whether something looks abnormal, but loose cells cannot be tested for hormone receptors or HER2 status.

This is why FNAC for breast lumps has largely been replaced over the past decade. It is not that the technique is poor; it is that the questions being asked of a biopsy have changed, and core biopsy answers them.

How long do results take, and what happens next?

Core biopsy tissue is sent to a pathology laboratory and a basic result — whether the tissue is benign, premalignant or malignant — usually comes back within a few days.

If cancer is found, receptor testing adds a few more days. Your oncologist will not plan treatment until those results are available, because the receptor status directly changes what is recommended.

Most breast lumps turn out to be benign. A benign result from a core biopsy is based on tissue examination — it is definitive, not a clinical impression.

Did you know?

Fibroadenoma — a smooth, firm, non-cancerous lump — is the most common finding in breast biopsies among women under forty in India.

A core biopsy result of fibroadenoma is definitive and does not require further surgery.

Source: ICMR Consensus Document on Management of Breast Diseases

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Common questions

Frequently asked questions

Is a core biopsy painful?

Most people describe it as pressure rather than pain. Local anaesthetic is given before the needle is inserted, and the numbing effect is reliable. You may feel a brief sting from the anaesthetic injection and a click when each sample is taken, but sharp pain during the procedure is uncommon. Mild tenderness and bruising at the site for a few days afterwards is normal and expected.

My doctor suggested FNAC — should I ask for a core biopsy instead?

It is reasonable to ask why FNAC is being recommended and whether core biopsy is more appropriate for your situation. In most cases today, core biopsy is preferred because it gives a more complete result. There are some situations — a lump that is clearly a fluid-filled cyst, for example — where aspiration may still be appropriate. Your doctor is the right person to explain the reasoning for your specific case.

What does it mean if the biopsy result is inconclusive?

An inconclusive result usually means the sample was too small or the tissue retrieved was not representative of the lump. It does not mean you have cancer. It means the test needs to be repeated, usually with imaging guidance, to get a usable result. Ask your team what the next step is and how soon it can be arranged.

Will a core biopsy leave a scar?

The needle entry heals with a very small mark that is usually not visible after a few weeks. Cosmetic outcomes vary between individuals. A biopsy needle removes only a tiny cylinder of tissue and does not change the shape of the breast. If cosmetic outcomes concern you, raise this with your treating team before the procedure.

Can I ask for my biopsy results in writing?

Yes. You are entitled to your pathology report, which will state whether the tissue is benign, premalignant or malignant and will include receptor results if those tests were run. Ask your treating team for a copy. Having the written report is useful if you seek a second opinion or are referred to another centre.

What is the difference between a core biopsy and a surgical biopsy?

A core biopsy is done through the skin with a needle, takes about twenty minutes, and does not require general anaesthesia. A surgical biopsy removes a larger piece of tissue through a skin incision and requires an operating theatre. Core biopsy is the standard first step; surgical biopsy is considered only if core biopsy results remain inconclusive after repeat attempts.

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