Observational cohort study on safety and efficacy of robotic thyroidectomy with super-meticulous capsular dissection versus open surgery for thyroid cancer: Postoperative dynamic risk assessment of radioactive iodine therapy.

Objective: To assess the efficacy and safety of robotic thyroidectomy (RT) with super-meticulous capsular dissection (SMCD) versus open thyroidectomy (OT) we used a dynamic risk assessment system incorporating 131I-WBS along with radioactive iodine (RAI) efficacy evaluation.

Background: Currently, the therapeutic efficacy of robotic surgery remains controversial. The 131I whole-body scan (131I-WBS) dynamic risk assessment system can detect small residual thyroid tissues and lesions, which may be used as indicators for the surgical efficacy of RT or OT thyroidectomy in differentiated thyroid cancer (DTC).

Methods: This retrospective cohort study included 2,349 patients who underwent total thyroidectomy followed by RAI therapy in our department between August 2017 and June 2023. Propensity score matching was performed at a ratio of 1:3 based on surgical type and mean follow-up duration to minimize selection bias after excluding those lost to follow-up. The primary outcome was surgical completeness, assessed using a dynamic risk system incorporating 131I-WBS along with RAI efficacy evaluation.

Results: There was no significant difference in the number of metastatic lymph nodes removed between the two groups (P=0.45). The incidence rate of parathyroid gland transplantation was 395 (68.7%) in the OT group and 8 (3.8%) in the RT group (P<0.001). There were no differences in the thyroidectomy completeness based on the 3-hour iodine uptake rate and 99mTcO4- thyroid imaging between the two groups. The dynamic risk assessment with and without 131I-WBS showed significant differences (P<0.001). The postoperative and post-RAI dynamic risk scores, evaluated at the time of RAI and 6 months after RAI, did not differ significantly between the two groups (P>0.05). The rates of transient and permanent hypoparathyroidism were higher in the OT group than in the RT group (P<0.05). The local recurrence rates showed no significant difference between the groups.

Conclusions: This study demonstrates that RT with SMCD can achieve outcomes equivalent to those of traditional open surgery when integrating the 131I-WBS dynamic evaluation system and the therapeutic effects of RAI. Additionally, robot surgery demonstrated a notable advantage in protecting parathyroid function.