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Kaplan–Meier graphs depicting OS in months stratified by (A) EGFR expression, (B) PTGS2 expression and (C) combined EGFR and PTGS2 expression. (A, B) HRR compares patients with high and low expression. (C) HRR compares patients in whom both EGFR and PTGS2 were highly expressed with patients in whom neither or either EGFR or PTGS2 levels were elevated.
