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Baseline PD-L1 expression and correlation to single-agent pembrolizumab response. (A-C) PD-1 pathway correlates baseline PD-L1/PAX-5 staining by immunohistochemistry (A), PD-L1 H score distribution across a cohort of 29 patients (B), and association between PET responses to single-agent pembrolizumab and PD-L1 H score in baseline biopsy specimens (C).
