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Long-Term Outcomes of Lateral Neck Dissection in Patients with Recurrent or Persistent Well-Differentiated Thyroid
Steven B Chinn1,2, Mark E Zafereo1, Steven G Waguespack3
11 Department of Head and Neck Surgery, The University of Texas MD Anderson Cancer Center , Houston, Texas.
Background:
Well-differentiated thyroid carcinoma (WDTC) has a high predilection for regional metastatic spread. Rates for WDTC lateral neck recurrence are reported to be as high as 24% in patients after initial thyroidectomy, lateral neck surgery, and adjuvant radioactive (RAI) iodine treatment. The objective of the study was to evaluate the efficacy, safety, and long-term outcome of comprehensive lateral neck dissection (LND) of levels II-V for recurrent or persistent WDTC in a tertiary referral center.
Methods:
This study retrospectively analyzed the standardized approach of LND for recurrent WDTC in the lateral neck compartment. Survival was analyzed by Cox regression analysis.
Results:
Three hundred and seven patients underwent 429 LND for cytopathology-confirmed lateral neck recurrent WDTC at the University of Texas MD Anderson Cancer Center between 1994 and 2012. The vast majority (90%) of patients were originally treated elsewhere. Multilevel lateral neck dissection had been originally performed in 80% of patients, with 17% having undergone at least two previous operations. Two hundred and sixty-seven (87%) patients had previous RAI. The most common levels of recurrence were levels III and IV (33% and 33%, respectively). Postoperative complications were seen in 7% of patients. Median follow-up was 7.2 years. In-field lateral neck control was 96% at 10 years. Overall lateral neck regional control, overall survival (OS), and disease-specific survival (DSS) at 10 years was 88%, 78%, and 91%, respectively. When stratifying by age (<24 years, 24-50 years, and >50 years), OS and DSS was significantly better in patients <50 years (OS: p < 0.001; DSS: p < 0.001). However, there was worse overall lateral neck control in the younger group (<24 years; p = 0.04). Regional recurrence after salvage LND occurred within a median time interval of 20.0 months (2.9-121.3 months), of which 2% (8/429) developed in-field lateral neck recurrences. Of those with any lateral neck recurrence after salvage LND, 24/30 (80%) patients successfully underwent another LND, resulting in an ultimate 98% lateral neck regional control rate.
Conclusions:
Expert comprehensive LND of levels II-V is associated with few perioperative complications and results in very high in-field regional control rate and ultimate lateral neck control in recurrent/persistent WDTC.
