PD-L1 expression in pleomorphic, spindle cell and giant cell carcinoma of the lung is related to TTF-1, p40 expression and might indicate a worse prognosis. by Violaine Yvorel, Arnaud Patoir, François Casteillo, Claire Tissot, Pierre Fournel, Marie-Laure Stachowicz, Georgia Karpathiou, Olivier Tiffet, Michel Péoc'h, Fabien Forest

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