Validation of the 8th edition AJCC ... - Journal of Cancer

NPI scores were calculated according to Rampault et al. (16): NPI = 0.2 x tumor size (cm) + lymph-node stage (1, 2 or 3) + histological grade (1, 2 or 3), where size is measured in centimeters; lymph node stage 1 is lymph node–negative, stage 2 is one to three positive lymph nodes, stage 3 is ≥ four positive lymph nodes… ................
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