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Kaplan–Meier estimates of the OS for patients with N1/N2 stage CRC after surgery according to (a) N, (b) NPLN, (c) LNR, (d) LODDS, and (e) ENE staging systems. CRC, colorectal cancer; NPLN, number of positive lymph nodes; LNR, lymph node ratio; LODDS, log odds of positive lymph nodes; ENE, extranodal extension.
