Fig. 2From: Clinical and prognosis value of the number of metastatic lymph nodes in patients with papillary thyroid carcinomaRFS according to the LN stage by Kaplan–Meier curves. a There was no significant difference in RFS between pN0 and pN1 (100.0% vs 99.4%, P = 0.05). b These showed poorer RFS in the pN1b than pN1a (97.7% vs 99.9%, P = 0.001);Back to article page