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Understanding your pathology report

Can IHC Be Done on — an Old Biopsy Block?

Yes, in most cases. If your original biopsy block has been kept at the hospital where the procedure was done, the laboratory can usually cut new slides from it and run IHC tests without putting you through another biopsy. The key question is whether the block can be located and whether enough tissue remains.

Medically reviewed by Dr. Muralidhar Muddusetty, Surgical Oncologist, MBBS (AIIMS) · MS Surgery (AIIMS) · DNB Surg Onc · MRCS (Edinburgh) · Last reviewed September 2026

  • Usually no repeat biopsy needed — The original archived block can be sent to a laboratory for IHC retesting in most cases.
  • Wax preservation lasts for years — Standard FFPE preservation keeps tissue viable for retesting long after the original procedure.
  • The hospital holds the block — Contact the pathology department where the biopsy was done — that is usually where the block is stored.
  • Some degradation is possible — Very old or poorly stored samples may give unclear results, which the pathologist will flag in the report.
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In most cases, yes. If your original biopsy block has been stored at the hospital where the procedure was done, the tissue can usually be retested for IHC markers without a repeat biopsy. How well the sample holds up depends on storage quality and how many years have passed.

Why can old biopsy tissue still be used for IHC?

Biopsy tissue is preserved using a wax-based process called formalin fixation and paraffin embedding, or FFPE. This keeps the tissue structure stable for many years — often decades — after the original procedure.

IHC applies antibodies to thin slices cut from that preserved block. As long as the block exists and has sufficient tissue, the laboratory can produce new slides for new markers without repeating the biopsy.

Cancer care sometimes requires markers that were not tested at diagnosis — because a new treatment option has emerged, or because your team is reassessing the original results with a current question in mind.

Terms you may see on your pathology paperwork

Paraffin block (also: wax block, tissue block)
The original biopsy tissue embedded in wax. This is what the laboratory cuts new slides from when retesting is needed.
FFPE
Formalin-fixed paraffin-embedded. The standard preservation method used for almost all biopsy tissue. FFPE blocks remain suitable for retesting for many years when stored correctly.
Archival tissue
Tissue from a previous biopsy or surgery held in the pathology department's storage. This is the starting point for any retest request.
Fresh cuts / cut sections
New thin slices taken from the archived block each time a retest is ordered. The block itself is not used up; only a small amount of tissue is removed each time.
Block retrieval
The formal process of locating your original block and releasing it to another laboratory for testing. Usually initiated by your oncologist with a written request.

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Retesting an archived block vs. a repeat biopsy

Retesting the archived blockRepeat biopsy
Procedure for youNone — the block already existsNew tissue sampling procedure
RiskNo added risk to youSmall procedural risk depending on the site
Time to resultDays to a week once the block is locatedLonger — procedure, then processing, then testing
When it may not workBlock unavailable, degraded, or tissue too smallTumour site is not safely accessible
Who decidesOncologist and pathologist togetherYour oncologist

Did you know?

Almost all biopsy tissue processed since the 1960s uses FFPE preservation — a method designed specifically for long-term archiving.

The College of American Pathologists recognises archival FFPE tissue as a valid source for IHC marker testing, including on blocks that are many years old.

Source: College of American Pathologists: Principles of Analytic Validation of Immunohistochemical Assays

Questions about getting your block retested

How do I find out where my block is?

Contact the pathology department of the hospital where the biopsy or surgery was done. Give them your name, the date of the procedure, and the pathology report number from your original report. If that hospital is different from where you are now being treated, your current oncologist's team can usually send the retrieval request on your behalf.

Will my block be returned after testing?

Most laboratories return the block after testing, but policies vary. Some keep the block and return only the new slides. Ask specifically when you make the retrieval request — particularly if the remaining tissue is limited and may be needed again later.

What if the report says 'inadequate sample'?

This means the tissue was too small, degraded, or did not stain clearly enough to give a reliable result. It is a technical finding about the sample, not a finding about your cancer. Your oncologist will discuss whether a repeat biopsy is needed and whether the marker result would change your treatment plan.

How long do hospitals in India keep biopsy blocks?

Most pathology departments keep surgical specimens and biopsy blocks for many years after the original procedure. Retention periods vary between institutions. If your block is from a procedure done more than a decade ago, contact the pathology department directly to confirm it is still held — some older blocks are archived off-site.

Can the block be sent to another city for retesting?

Yes. Blocks and slides are routinely transported between laboratories and reference centres. Your oncologist or the requesting laboratory arranges the logistics. You do not need to carry it yourself, but confirm the expected timeline so you are not waiting without a clear date.

Does the age of the block affect which markers can be tested?

It can. Some antibodies used in IHC work reliably on older FFPE tissue; others are more sensitive to degradation over time. A skilled pathologist will choose the best retrieval technique for the age of the block and will flag in the report if any marker could not be reliably assessed. Ask your pathologist if the result is being used to guide a treatment decision.

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Common questions

Frequently asked questions

Can any laboratory retest my block, or does it need to go to a specialist?

Most pathology laboratories that perform diagnostic IHC can work with archival FFPE blocks. For complex or less common markers, your oncologist may request testing at a reference laboratory with validated protocols for that specific marker. Your team will advise where the block needs to be sent based on what is being tested.

My biopsy was done at a government hospital. Can I still retrieve the block?

Yes. Government hospital pathology departments hold blocks on the same archival basis as private institutions. Submit a written request through your oncologist, including the original pathology report number and the procedure date. The process may take longer than at a private centre — factor this into your treatment timeline.

Why is my oncologist asking for new IHC testing if it was already done at diagnosis?

Several reasons are possible. A treatment option may have become available that requires a marker not tested before. The disease may have changed after treatment, and an updated marker profile is needed to guide the next step. Or your team may be reassessing the original findings. Retesting is not a sign the original testing was wrong — it means your team is being thorough.

What should I take with me when I go to request my block?

Bring your original pathology report, discharge summaries from the procedure, your identification, and a referral letter from your oncologist stating why the block is needed and where it should be sent. The pathology report number and procedure date are the most useful details for the search — without them, locating the block can take much longer.

Can IHC be done on an old sample if the cancer has come back?

Possibly, and your oncologist will weigh two things: whether the archived block has enough remaining tissue, and whether a result from the original tumour reflects the current disease. Tumour biology can change between a first diagnosis and a recurrence, so your team may decide a fresh biopsy gives more useful information than retesting the original block.

What does 'insufficient tissue for IHC' mean on my report?

It means the block did not contain enough viable cells, or the preserved tissue did not stain clearly enough, to give a reliable result for that marker. This is a technical finding about the sample — not a finding about your cancer. Your oncologist will decide whether the marker matters enough to warrant a new biopsy for a fresh sample.

Full index

Browse all 701 biopsy topics

Every page in this section, grouped by the part of the journey it belongs to. Pick a group to see what is in it.

What Is a Biopsy?

What Is a Biopsy? Everything You Need to Know →

Types of Biopsy Compared

Which Biopsy Will You Have? Techniques Compared →

Preparing for a Biopsy

What to Expect on the Day of Your Biopsy →

Recovery and Aftercare

After a Biopsy: Recovery, Aftercare and Warning Signs →

Biopsy by Body Part

Biopsy by Body Part: What to Expect at Each Site →

Understanding Your Report

How to Read a Biopsy Report: Terms Explained →

IHC and Molecular Markers

IHC and Molecular Markers on a Biopsy: What They Mean →

Grading and Scoring Systems

Cytology & Prostate Scoring Systems Explained →

How Accurate Is a Biopsy?

How Accurate Is a Biopsy? Errors and Second Opinions →

If Your Result Is Benign

Your Biopsy Is Benign: What It Means and What Comes Next →

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