PD-L1 LDT on Dako Autostainer Link 48 (ASL48) using the concentrate 22C3 antibody. This protocol was developed in the laboratory of Dr. Paul Hofman and Dr Marius Ilie (Pasteur Hospital, Nice, France).For the purpose of protocol development 95% of clinical specimens consisted of surgical resection specimens and the remaining 5% were bronchial biopsies and ransbronchial mediastinal lymph node biopsies.