Analysis of Delayed Surgery and Clinical Outcomes in Intermediate- and High-risk Papillary Thyroid Cancer

The optimal timing to performing thyroid surgery following a diagnosis of papillary thyroid cancer (PTC) has yet to be fully defined.

We aimed to examine if a delayed surgery may worsen the clinical outcome of PTC patients with intermediate- to high-risk of recurrence.

All consecutive PTC patients with intermediate- to high-risk of recurrence who underwent total thyroidectomy and radioactive iodine (RAI) ablation at 3 tertiary hospitals in southwest China were retrospectively included. Excellent response at 1-year follow-up after initial therapy was defined as no clinical, imaging, or biochemical evidence of PTC. Association of the timing of surgery and excellent response rates.

The study included 871 patients. The median time interval between PTC diagnosis and surgery was 2 months (range, 1-87 months). Patients were divided according to the timing of surgery, < 6 months (group A, 624/871 [71.6%]), ≥ 6 to 11 months (group B, 123/871 [14.1%]), or ≥ 12 months (group C, 124/871 [14.2%]). One year after initial therapy, 64.7%, 71.5%, and 66.1% of patients in groups A, B, and C, respectively, achieved excellent response (P = 0.27). The lack of impact of surgery timing was observed across intermediate- to high-risk classifications and all T stage categories. These findings did not change when we separately analyzed the groups according to RAI dose (intermediate-dose group: ≤ 3.7 GBq [n = 654], and high-activity group: 5.5 GBq [n = 217]) further subdivided according to the timing of surgery.

Timing of surgery does not seem to affect short-term disease outcomes in intermediate- to high-risk PTC patients. Further research is necessary to assess the impact of delayed surgery on long-term prognosis.