Filiz Oezkan, MD, University Hospital Essen, Essen, Germany, discusses the challenges associated with testing for PD-L1 positivity in patients with non-small cell lung cancer (NSCLC), including whether the biopsy sample had been taken from the correct place, and what to do if the patient is PD-L1-negative. This interview took place at the IASLC 2022 World Conference on Lung Cancer congress in Vienna, Austria.

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