Abstract
The association between programmed death ligand 1 (PD-L1) expression and survival among melanoma patients treated with chemotherapy is unclear.1-5 We retrospectively characterized PD-L1 levels in patients with melanoma treated at Aarhus University Hospital in Denmark (2001-2012) using a prototype immunohistochemistry assay (QualTek Molecular Laboratories, Goleta, California, USA) and investigated the association between PD-L1 and overall survival (OS) in patients who received chemotherapy or immunotherapy (interleukin-2, interferon, ipilimumab). None of the patients received pembrolizumab or nivolumab.
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