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Ning (no staining for p-ERK (score 0); weak p-ERK (score 1+), moderate p-ERK (score 2+), and strong p-ERK (score 3 +) staining) in Fig. 3. Staining intensities were grouped as dichotomous variables, defining scores 0? as low and 2? as high expression levels [25]. Evaluation of staining was carried out independently by two pathologists (MM and MA) blinded to patients' outcome and pathological stage

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