IMMUNOHISTOCHEMISTRY, CYTOKERATIN (PANCYTOKERATIN)

The IHC – Cytokeratin (Pancytokeratin / PanCK) test is an immunohistochemistry-based diagnostic assay used to detect a broad range of cytokeratin proteins in tissue samples. Cytokeratins are structural proteins found in epithelial cells, which line the surfaces and cavities of organs throughout the body.

Pancytokeratin is one of the most commonly used markers in surgical pathology because it can identify epithelial-origin cells and tumors. The test helps pathologists determine whether a tumor is a carcinoma (epithelial cancer) or originates from another tissue type such as lymphoid, mesenchymal, or neural tissue.

Benefits of the Test

• Helps identify epithelial-origin tumors
• Assists in diagnosing carcinomas
• Supports differentiation of carcinomas from non-epithelial tumors
• Improves tumor classification accuracy
• Helps determine the origin of metastatic cancers

Why Doctors Recommend This Test

Doctors recommend the IHC Pancytokeratin test when evaluating tumors of unknown origin or suspected epithelial malignancies. It is commonly used in:

• Diagnosis of carcinomas
• Evaluation of metastatic tumors
• Identification of epithelial differentiation
• Tumor classification and staging
• Oncology biopsy interpretation

Pancytokeratin is frequently included in initial immunohistochemistry panels because it serves as a broad epithelial marker. It is often used alongside CK7, CK20, EMA, Vimentin, S100, and CD markers to accurately classify tumors.

Preparation Before Test

No special preparation is required for this test. Important considerations include:

• The test is performed on a biopsy or surgical tissue sample
• No fasting or medication restrictions are needed
• Clinical history and imaging findings may assist interpretation

Normal Reporting Time

The typical turnaround time is 3 to 5 working days, depending on specimen processing and laboratory workflow.

Who Should Take This Test

• Patients with suspected carcinoma
• Individuals with tumors of unknown origin
• Cases requiring differentiation between epithelial and non-epithelial tumors
• Patients undergoing cancer biopsy evaluation
• Oncology patients requiring immunohistochemistry profiling

The IHC Pancytokeratin test is an essential diagnostic tool in modern pathology. By identifying epithelial cell markers, it helps pathologists classify tumors accurately and supports appropriate treatment planning for cancer patients.

Clinical Significance

Pancytokeratin staining is widely used in the diagnosis and evaluation of:

• Carcinomas of various organs
• Metastatic epithelial cancers
• Lung cancer
• Breast cancer
• Gastrointestinal carcinomas
• Head and neck cancers
• Tumors with uncertain cellular origin

Because PanCK reacts with multiple cytokeratin proteins, it serves as a highly effective screening marker for epithelial differentiation.