IHC PDL1 (22C3) : PDL1 -DAKO

What this test checks

Measures the level of PDL1 protein in tumour tissue. PDL1 is a protein that some cancers use to hide from the immune system. High PDL1 levels predict whether immunotherapy drugs (checkpoint inhibitors) are likely to work.

Why do people get this test?

Immunotherapy has transformed cancer treatment, but it works best in tumours with high PDL1 expression. This test tells your oncologist whether immunotherapy is the right choice for your cancer.

When you should consider this test

• When planning treatment for lung cancer, bladder cancer, head and neck cancer, or other PDL1-relevant cancers
• Before starting immunotherapy (PD-1/PDL1 inhibitor) drugs
• When reassessing treatment options after initial therapy

How to prepare

No preparation needed — the test is performed on tumour tissue already collected during a biopsy or surgery.