Reading Your Histopathology Report

'Tumour Type' and 'Subtype' — Explained

Your biopsy report is written in medical language intended for another doctor. These two words — type and subtype — carry more weight than they may seem. The subtype, in particular, can determine your treatment more than the organ where the cancer was found.

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

Not the same thing — Type names the cell family. Subtype is more specific, and it is often the subtype that guides treatment decisions.
Subtype can override site — For some cancers, which subtype you have matters more than the organ where the tumour began.
Determined from your tissue — The pathologist establishes type and subtype by examining your biopsy sample — sometimes with extra staining or molecular tests.
Ask for both in writing — If you cannot see a subtype on your report, ask whether one has been determined or whether further testing is still under way.

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Your histopathology report names a tumour type — the cell family the cancer comes from — and often a subtype within that family. The subtype can matter more than the organ of origin when your oncologist selects treatment. Ask your doctor to explain both entries in your own report.

What is the difference between tumour type and subtype?

	Tumour Type	Subtype
What it names	The broad cell family the cancer comes from	A more specific category within that family
Example	Carcinoma	Adenocarcinoma or squamous cell carcinoma
How it is found	Microscope examination of biopsy tissue	Microscopy plus extra staining or molecular tests
Why it matters	Confirms the cancer's broad origin	Often determines which drugs are likely to work
Can it override the organ?	No — it reflects the organ's own cell type	Yes — subtype can be more decisive than site for treatment

What do you do when you see these words in your report?

Write down the exact type and subtype as printed in the report.
Ask your oncologist what the subtype means for your treatment plan.
Ask whether additional tests are still needed to confirm or refine the subtype.
Do not compare your subtype directly to another person's — the same term can behave differently in different people.
Bring the full written report to every appointment, not just a summary.

Does the subtype change which treatment you will receive?

In many cancers, yes. The subtype tells your oncologist which cell characteristics are present, and different subtypes respond to different treatments.

Two people with cancer in the same organ can receive entirely different treatments if their subtypes differ. This is why the subtype is one of the first things your oncologist confirms before finalising a plan.

If your subtype result depends on additional molecular testing, your full treatment plan may not be ready until those results arrive. Asking when they are expected is a reasonable question at your next appointment.

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What do the common type and subtype terms actually mean?

Carcinoma: Cancer arising from epithelial cells — the cells that line organs and glands. The most common broad type for solid tumours.
Adenocarcinoma: A carcinoma subtype arising from gland-forming cells. Common in the lung, colon, breast, stomach, and prostate.
Squamous cell carcinoma: A carcinoma subtype arising from flat, scale-like cells. Common in the head and neck, lung, oesophagus, and cervix.
Sarcoma: Cancer arising from connective tissues such as bone, muscle, fat, or blood vessels. Treated differently from carcinomas.
Lymphoma: Cancer arising from lymphocytes (immune cells). Divided into many subtypes — including Hodgkin and non-Hodgkin — each with distinct treatment approaches.
Well-differentiated / Poorly differentiated: Describes how much the cancer cells still resemble normal cells. Poorly differentiated cells have changed more and tend to grow faster.

Did you know?

For certain cancers — including lung adenocarcinoma and some breast cancers — treatment guidelines from NCCN and ESMO now assign therapy primarily by molecular subtype, not by the organ where the tumour began.

Two people diagnosed with cancer in the same organ may receive entirely different treatments if their subtypes differ.

Source: NCCN Clinical Practice Guidelines in Oncology; ESMO Clinical Practice Guidelines

Questions families ask most about type and subtype

The report names a type but no subtype — is something missing?

Not necessarily. For some cancers, the broad type alone is enough to guide the first steps of treatment, and subtyping is done separately or only when required. For others, the subtype requires molecular testing that takes additional time beyond standard microscopy. Ask your oncologist whether a subtype is being determined, what is being tested, and when the result is expected. A clear timeline is a reasonable thing to ask for.

Can the subtype change after treatment starts?

The subtype recorded at diagnosis does not change — it describes the tumour as it was at the time of your biopsy. What can change is how the cancer behaves if it recurs or spreads. A new biopsy may be taken at that point because the returning tumour can sometimes show different characteristics from the original. Your oncologist will tell you if a new biopsy is needed at any stage of your care.

My report says 'poorly differentiated' — what does that mean for me?

'Poorly differentiated' means the cancer cells look very different from the normal cells they came from. It describes how much the cells have changed, not the diagnosis on its own. Your oncologist uses it alongside subtype, stage, and other results to plan treatment. It does not mean, by itself, that the cancer cannot be treated. Your oncologist is the right person to explain what it means in your specific situation.

We found the same subtype in two family members — does that mean it is genetic?

A shared subtype does not automatically mean a genetic cause. Many subtypes are common enough that two cases in a family can be coincidence, and some occur more frequently in certain populations without involving an inherited gene variant. A hereditary link is established through genetic testing, not through comparing diagnoses. If your oncologist suspects an inherited pattern based on the family history as a whole, they will refer you for genetic counselling. Do not draw conclusions from the subtype alone.

The terms on my report look different from what I read online — why?

Classification systems are updated regularly, and different bodies — WHO, NCCN, ESMO — use terminology that can vary slightly between editions or regions. Your Indian report is valid; it may reflect a different edition of the classification or a slightly different wording for the same concept. If you are uncertain whether your report uses current terminology, ask your pathologist or oncologist rather than relying on an online comparison.

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Common questions

Frequently asked questions

What does 'tumour type' mean in a biopsy report?

Tumour type names the cell family the cancer comes from — not the organ, but the kind of cell that became cancerous. The most common is carcinoma, which means cancer of epithelial cells. Your oncologist uses the type to understand the cancer's origin and narrow down which treatments apply. It is established from the microscope examination of your biopsy tissue and is usually among the first entries on the pathology report.

What is a subtype, and why does my report include it?

A subtype is a more specific classification within the broad tumour type. Where the type tells you the cell family, the subtype tells you which branch of that family and how it behaves. For many cancers, the subtype is the detail that determines treatment — it can matter more than the organ where the tumour began. Subtypes are identified through additional staining of the biopsy tissue or through molecular testing.

Does the subtype affect which treatment I will receive?

In many cancers, yes. Different subtypes respond differently to chemotherapy, targeted therapy, immunotherapy, and hormone treatments. Your oncologist uses the subtype alongside your stage and other results to decide the most appropriate approach. If your subtype result depends on further testing, your full plan may not be finalised until it arrives — which is why asking when that result is expected is a worthwhile question at your next appointment.

My report says 'adenocarcinoma' — is that a type or a subtype?

Adenocarcinoma is a subtype. The broader type is carcinoma — cancer of epithelial cells. Adenocarcinoma specifies that the cancer arises from gland-forming cells within that family. It is one of the most common subtypes and appears in the lung, colon, breast, stomach, and other organs. Knowing it is adenocarcinoma rather than carcinoma alone helps your oncologist choose the appropriate treatment and decide whether further molecular testing is needed.

Can the subtype on my report be wrong? Should I get a second opinion?

Pathology interpretation can occasionally differ between specialists, particularly for rare subtypes or borderline cases. If your oncologist has any uncertainty, they will ask for a review. You are entitled to request a second pathology opinion at any point, and seeking a second opinion on your overall treatment plan is also reasonable for any cancer diagnosis. If you do, take the original biopsy slides and the full written report — not a summary — to the second specialist.

What if the words on my report are too medical to understand?

Most reports are written in terminology intended for another doctor, and you are not expected to interpret them on your own. Ask your oncologist to walk you through the key entries — type, subtype, grade, and margins are the most important. You can also ask for a plain-language summary in writing. If you need time to understand what you have been told, that is a normal response, and asking the same question more than once is part of your care, not an imposition.

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