Dr. Dorothy Hayden, a pathologist with Roche Diagnostics, provides a brief overview of the Ventana PD-L1 (SP263) assay & staining in non-small cell lung carcinoma (NSCLC) specimens.  Please note that the fixation time has been updated since this video was produced.  Recommended fixation is 6-72 hours in 10% neutral buffered formalin (NBF).   This is part 1 of a 3 part series.