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Disease‐specific survival curves in the groups with intra‐thyroid, lymph node metastasis, soft tissue invasion, or distant metastasis of PTC (P = 0.0005 between intra‐thyroid vs. lymph node metastasis; P = 0.0001 between intra‐thyroid vs. soft tissue invasion, and intra‐thyroid vs. distant metastasis; lymph node metastasis vs. distant metastasis; soft tissue invasion vs. distant metastasis; P = 0.6261 between lymph node metastasis vs. soft tissue invasion).
