[Treatment strategy for T4N1 thyroid papillary carcinoma based upon our clinical experience]

We retrospectively evaluated clinical profiles and prognoses in 152 patients with thyroid papillary carcinoma treated at Fukui Medical University between 1986 and 2000. As standard treatment, 106 (70%) underwent hemithyroidectomy to preserve the normal thyroid lobe. Subtotal thyroidectomy or total thyroidectomy was conducted on 40 cases (23%). Regional lymphnodes were extirpated in 104 (68%) with pathological N0, and radical or conservative neck dissection for 46 cases (30%) with pathological N1. Overall survival for 10 years, estimated using the Kaplan-Meier method, was 100% in both stage I and II, and 95% in stage III. Of 152 thyroid papillary cases, 22 (14%) had tumor recurrence. Of 51 in stage III, 14 (27%) had tumor recurrence. The 14 recurrent in stage III showed local extrathyroidal invasion. Note that 5 of 10 (50%) T4N1 treated with hemithyroidectomy had tumor recurrence in the residual thyroid lobe. Of 11 T4N0 cases who underwent hemithyroidectomy, none had tumor recurrence in the residual thyroid lobe. Results suggest that patients with T4N1 should be treated by total thyroidectomy and neck dissection at initial treatment. Tumor size, cervical lymphnodal metastasis, and distant metastasis may be prognostic factors for thyroid papillary carcinoma.