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Kaplan–Meier estimates of relapse-free survival (RFS) (a) and overall survival (OS) (b) of the patients with tumors stratified by the infiltration of OX40+ lymphocytes in tumor stroma. Kaplan–Meier estimates of RFS (c) and OS (d) of the patients with tumors stratified by the expression of OX40+ lymphocytes in cancer nest. Vertical bars indicate the censored cases at the data cutoff point
