Kaplan–Meier survival curves generated using quartile H-scores as cutoff values for stroma, tumor, and stroma + tumor showed a trend between higher H-score and improved prognosis ( Figure S1C–H ).
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Contrasting Roles of Programmed Death-Ligand 1 Expression in Tumor and Stroma in Prognosis of Esophageal Squamous Cell Carcinoma.
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