IHC Marker – TTF-1 Test: Booking, Price, and Results
About IHC Marker – TTF-1 Test: Booking, Price, and Results
| Field | Value |
|---|---|
| Also Known As | TTF-1 IHC, Thyroid Transcription Factor-1 Immunohistochemistry, NKX2-1 IHC Marker, TTF1 Test |
| Sample Type | Tissue biopsy (FFPE block — formalin-fixed, paraffin-embedded tissue) |
| Fasting Required | No. This test is performed on preserved tissue, not blood or urine |
| Report Time | 7 days |
| Recommended For | Men and women of any age when a lung or thyroid tumour is being investigated |
| Price | Starting at ₹1,920 |
What Is an IHC Marker – TTF-1 Test?
The IHC marker – TTF-1 test detects a protein called 'Thyroid Transcription Factor-1' in preserved tissue samples using a technique called 'immunohistochemistry' (IHC). TTF-1 is a DNA-binding protein normally present in thyroid follicular cells and certain lung cells. A pathologist orders this test when a tumour has been biopsied and its origin needs to be identified. The test is also referred to as 'TTF-1 IHC', 'NKX2-1 IHC marker', or 'Thyroid Transcription Factor-1 Immunohistochemistry'.
What Does an IHC Marker – TTF-1 Test Measure?
This test analyses tissue from a biopsy to determine whether the TTF-1 protein is present in the tumour cells. TTF-1 is normally found in specific cells of the lungs and thyroid gland, so its presence (or absence) in a tumour gives pathologists important clues about where that tumour originated. The result is reported as positive or negative based on microscopic examination of the tissue staining pattern.
| Parameter | What It Indicates |
|---|---|
| TTF-1 Expression (Positive) | Nuclear staining is present; suggests the tumour likely originated from the lung or thyroid |
| TTF-1 Expression (Negative) | No staining detected; suggests the tumour may have originated elsewhere in the body |
This is a qualitative test. Unlike routine blood tests, it does not produce numerical values. A trained pathologist evaluates the presence, intensity and extent of staining under a microscope.
Why Is an IHC Marker – TTF-1 Test Done?
A pathologist or oncologist may request the IHC marker – TTF-1 test procedure when a tissue biopsy reveals an abnormal growth and the origin of the tumour is not immediately clear.
Common Symptoms That May Require This Test
Several clinical findings and symptoms may lead a doctor to order an IHC marker – TTF-1 test:
- An unexplained lung mass or nodule seen on a CT scan or chest X-ray
- Persistent cough or difficulty breathing without a clear cause
- A nodule or lump found on the thyroid gland during examination
- Swollen lymph nodes requiring cancer typing
- Suspected spread of cancer (metastasis) from an unknown primary site
- Abnormal findings on a PET scan or MRI suggesting a tumour of uncertain origin
Conditions This Test Can Help Detect
This test supports the identification of several cancer types. The following conditions may be investigated using the TTF1 test:
- Primary lung adenocarcinoma (lung cancer arising within the lungs)
- Pulmonary small cell carcinoma
- Neuroendocrine tumours of the lung (hormone-producing tumours)
- Thyroid carcinomas, including follicular and medullary types
- Differentiation of primary lung cancer from cancers that have spread from the breast, colon, ovary or kidney to the lung
- Small cell lung carcinoma versus lymphoid infiltrates (collections of immune cells)
How to Prepare and What to Expect
As this test uses preserved tissue from a biopsy rather than a fresh blood or urine sample, preparation is different from routine lab tests. Here is what you need to know before submitting a sample for the IHC marker – TTF-1 test procedure.
Do You Need to Fast?
No fasting is required. This test analyses a tissue block, not blood or any body fluid affected by food intake. You may eat and drink normally on the day of sample submission.
Practical Tips Before Your Test
Being well prepared helps the laboratory process your sample without delays. Keep the following in mind:
- Bring a detailed clinical history, including your symptoms, previous test results and family history, as this is required for the test.
- Carry your doctor's referral letter, specifying the biopsy site and reason for the test.
- Submit any existing histopathology reports along with the tissue block or unstained slides.
- Include relevant imaging reports such as CT scans, MRIs, X-rays or PET scans if available.
- Continue your usual diet and medications unless your doctor has advised otherwise.
Step-by-Step Procedure
The IHC marker – TTF-1 test procedure involves several stages, from tissue collection to final reporting.
- A tissue sample is obtained through a biopsy — this may be a needle biopsy, a bronchoscopic biopsy or a sample collected during surgery, depending on the tumour's location. No additional sample collection is needed for the IHC test itself.
- The collected tissue is fixed in formalin and embedded in paraffin wax to preserve it, creating a stable tissue block.
- The laboratory cuts the block into very thin sections (approximately 4 micrometres thick) and places these on glass slides.
- The slides are treated with a specialised anti-TTF-1 antibody, which binds to the TTF-1 protein if it is present in the cells.
- A pathologist examines the slides under a microscope and looks for nuclear staining — cells showing staining in the nucleus are recorded as TTF-1 positive.
- The final report is prepared with the staining result, any relevant observations and the pathologist's interpretation.
Factors That Can Affect Accuracy
Certain factors may influence the reliability of the test result:
- Delays between tissue collection and formalin fixation can cause tissue deterioration, reducing the detection of TTF-1
- Overly prolonged exposure to formalin can cross-link proteins and interfere with marker detection
- Tissue sections that have been stored for extended periods may show reduced staining intensity
- Tumour heterogeneity (natural variation within the tumour) can affect how uniformly the marker is expressed
- The quality of the antibody clone used in the laboratory
Understanding Your IHC Marker – TTF-1 Test Results
Results from this test must be reviewed alongside other clinical information, including imaging findings, biopsy reports and your doctor's assessment. The table below provides a general guide to result interpretation.
| Result | What It May Suggest |
|---|---|
| Positive (staining present) | Tumour likely originates from the lung or thyroid; it is seen in lung adenocarcinoma, small cell carcinoma, neuroendocrine lung tumours and thyroid carcinomas |
| Negative (no staining) | Tumour may originate from another organ; around 20% of primary lung adenocarcinomas can also be TTF-1 negative |
Disclaimer: These ranges are general guidelines. Your doctor will interpret your results based on your age, health history and other factors. Always consult a qualified healthcare professional for personalised medical advice.
Results During Special Conditions
Some situations can make result interpretation more complex:
- Loss of TTF-1 expression in non-small cell lung carcinoma has been associated with more aggressive tumour behaviour, so a negative result in this context carries additional clinical significance.
- TTF-1 can be positive in neuroendocrine tumours arising outside the lung, so a positive result alone does not confirm a lung origin when such tumours are present.
- Rarely, gastric tumours may show TTF-1 positivity, which can be mistaken for spread from lung cancer. Results should always be interpreted alongside the full clinical picture.
How to Maintain Healthy Levels
The TTF-1 IHC test is a diagnostic marker used in cancer investigation, not a routine wellness test. General lifestyle choices do not directly influence TTF-1 expression. The following apply in this context:
- Avoid smoking, as it is a well-established risk factor for lung cancer.
- If a diagnosis is being investigated, continue following your doctor's guidance on follow-up tests and consultations.
- Share all reports, including previous biopsy results and imaging, with your treating specialist for the most accurate interpretation.
- Consult your oncologist or specialist for advice on next steps based on your results.
Lupin Diagnostics IHC Marker – TTF-1 Test Price
The IHC marker – TTF-1 test cost at Lupin Diagnostics starts at ₹1,920. This test requires a visit to a Lupin Diagnostics centre; home collection is not available for this test as it involves submission of a tissue block rather than a routine blood or urine sample.
| City | Approximate Price (₹) |
|---|---|
| BHOPAL | 1920 |
| CHENNAI | 1920 |
| HYDERABAD | 1920 |
| KOLKATA | 1920 |
| NAVI MUMBAI | 1920 |
| PUNE | 1920 |
Disclaimer: Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
IHC marker – TTF-1 test online booking at Lupin Diagnostics is straightforward.
- Select the test on the Lupin Diagnostics website.
- Choose your city and preferred centre location.
- Visit the centre at your scheduled time to submit your FFPE tissue block along with the required clinical history and documents.
- Receive your report via email or WhatsApp within the stipulated turnaround time.
Frequently Asked Questions
This test helps pathologists determine whether a tumour originated from the lung or thyroid gland. It is an important part of cancer diagnosis, particularly when a biopsy has revealed a tumour and its origin is unclear. Results are used alongside imaging and other laboratory findings.
The tissue sample is obtained through a biopsy, which may be a needle biopsy, a bronchoscopic biopsy or a sample removed during surgery. The IHC marker – TTF-1 test is then performed on that existing preserved tissue; no separate collection procedure is required specifically for the IHC analysis.
A positive result suggests the tumour likely originated from the lung or thyroid, but it does not confirm a diagnosis on its own. Pathologists and oncologists interpret TTF-1 results together with clinical findings, imaging reports and other tissue markers before reaching a conclusion.
Yes. Small cell lung carcinoma and certain neuroendocrine tumours may also express TTF-1. In rare cases, gastric tumours have shown TTF-1 positivity. For this reason, the TTF-1 test result is always interpreted in combination with other markers and the overall clinical picture.
Lupin Diagnostics delivers results within 7 days. The processing time is longer than routine blood tests because the tissue must be sectioned, stained and examined carefully by a trained pathologist.
A negative TTF-1 result does not rule out lung cancer. Approximately 20% of primary lung adenocarcinomas do not express TTF-1. In such cases, additional markers — such as Napsin A or specific cytokeratins — may be tested to support or refute the diagnosis.
No. This test requires a formalin-fixed, paraffin-embedded tissue block obtained through a clinical biopsy procedure. It cannot be collected at home and must be submitted at a Lupin Diagnostics centre along with the required clinical history documentation.
IHC Marker – TTF-1 Test: Booking, Price, and Results
