Background: The 2015 American Thyroid Association (ATA) guidelines called for consideration of thyroid lobectomy (TL) as an acceptable surgical treatment for small and less aggressive papillary thyroid cancers (PTC) with no clinical evidence of metastasis or extrathyroidal extension. Optimal extent of surgery, however, remains controversial.
Methods: A systematic literature review was performed according to the Preferred Reporting Items for Systematic Reviews and Meta-analysis (PRISMA) guidelines. PUBMED, EMBASE, Scopus, and Cochrane Library databases were searched to identify studies comparing TL to total thyroidectomy (TT) for low-risk PTC. Studies were grouped according to the major outcomes in the literature: survival and the need for completion thyroidectomy (CT).
Results: Overall survival for low-risk PTC patients who underwent TL was comparable to TT. Locoregional recurrence (LRR) rate following TL was less than 6% and salvaged with CT. The proportion of patients meeting the 2015 ATA guidelines selection criteria for TL who subsequently would need CT varied by study but averaged 34%. After excluding microscopic extrathyroidal extension and positive resection margin as indications for CT to facilitate radioactive iodine ablation, the estimated rate across the included studies was 11%.
Conclusions: We performed a systematic review of outcomes following TL or CT for low-risk PTC according to 2015 ATA guidelines. Initial operative approach did not have a negative impact on overall survival. There is a paucity of high-quality data on this topic across the literature. Long-term follow-up studies on oncologic and patient-centered outcomes are essential.
Keywords: 2015 ATA guidelines; Extent of thyroidectomy; Long-term outcomes; Risk stratification; Thyroidectomy.
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