
PDL-1 22C3 Dako







The PDL-1 22C3 Dako test is an advanced diagnostic test used to measure the expression of the PD-L1 protein on tumor cells. It helps determine whether a patient may respond well to immunotherapy drugs such as pembrolizumab (Keytruda).









Understanding PDL-1 22C3 Dako
Programmed Death-Ligand 1 (PD-L1) is a protein found on the surface of normal and cancer cells. It plays a key role in helping cancer cells evade the immune system by binding to the PD-1 receptor on immune cells and suppressing their attack.
The PDL-1 22C3 Dako test uses immunohistochemistry (IHC) to detect and measure PD-L1 expression in tumor tissue. The Dako 22C3 pharmDx assay is an FDA-approved companion diagnostic for selecting patients who are likely to benefit from pembrolizumab (Keytruda) and other PD-1/PD-L1 inhibitors.
By analyzing PD-L1 expression, doctors can predict how well a patient’s tumor may respond to immunotherapy. This information helps in personalizing cancer treatment plans and improving clinical outcomes.
Doctors usually recommend this test for patients diagnosed with cancers such as non-small cell lung cancer (NSCLC), melanoma, head and neck cancers, urothelial carcinoma, and gastric cancers.
For this test, it is important to submit the clinical history, histopathology report, previous test results, and a doctor’s prescription at the time of sample collection. The Tata 1mg consolidated Test Requisition Form (TRF) must also be duly filled and submitted.
Lab test results may vary across different laboratories. Abnormal test results require an expert interpretation. Therefore, never try to self-medicate at home based solely on these results, and always consult a doctor for a proper understanding of the test results.
Disclaimer: In no event shall the liability of TATA 1MG exceed the amount of the actual cost of test charges incurred by the customer as stated on the invoice issued by Tata 1mg.
What does PDL-1 22C3 Dako measure?
The PDL-1 22C3 Dako test measures the level of PD-L1 protein expression on tumor cells using IHC with the Dako 22C3 antibody clone. The results are reported as a Tumor Proportion Score (TPS), which represents the percentage of tumor cells showing PD-L1 staining. The score helps doctors understand whether a patient is likely to respond to immunotherapy medicines such as pembrolizumab (Keytruda) and plan the most suitable treatment approach.





FAQs related to PDL-1 22C3 Dako
- Torous VF, Rangachari D, Gallant BP, Shea M, Costa DB, VanderLaan PA. PD-L1 testing using the clone 22C3 pharmDx kit for selection of patients with non-small cell lung cancer to receive immune checkpoint inhibitor therapy: are cytology cell blocks a viable option? J Am Soc Cytopathol. 2018 May-Jun;7(3):133-141. [Accessed 06 Nov. 2025]. Available From:
- Surucu A, Hou T, Kuhar M, Durm G, Mesa H. Comparison of PD-L1 IHC 22C3 PharmDx Combined Positive Score (CPS) in Primary Versus Metastatic Nodal Squamous Cell Carcinomas of the Head and Neck: Is There a Significant Difference? Appl Immunohistochem Mol Morphol. 2023 Sep 1;31(8):550-554. [Accessed 06 Nov. 2025]. Available From:
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