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Figure 2: ROC curve analyses of miRNA-221 (a), miRNA-222 (b), miRNA-146b (c), miRNA-181 (d), miRNA-21 (e), and the 5-miRNA set (f) in the discrimination of patients with PTC from patients with BTN. The AUCs for miRNA-221, miRNA-222, miRNA-146b, miRNA-181, miRNA-21, and the 5-miRNA set were 0.872, 0.868, 0.952, 0.837, 0.877, and 0.937, respectively.