The new ATA Guidelines are a welcome ‘‘upgrading’’ of the initial work published in 2006, made necessary by the ever-changing evidence from new studies with compelling data and high quality methodology. The role of clinical research is to allow us to rationalize and refine our practices for the benefit of our patients: ‘‘Use of the best information, thus minimizing bias and opinion, is the key element that separates ethical medical practitioners from quacks and charlatans’’ (1). This was the role of the task force in reviewing this new information, evaluating its scientific quality and its clinical implications, and ‘‘digesting’’ it into clear, precise, state-ofthe-art guidelines. New evidence concerning the surgical management of thyroid carcinoma has allowed the task force to refine their recommendations in this latest version of the Guidelines. Concerning total thyroidectomy versus lobectomy, the new Guidelines have refined the indications with more precise wording, in part based on data from a recent study of more than 50,000 patients that showed significantly improved recurrence and survival rates after thyroidectomy as opposed to lobectomy for tumors larger than 1 cm (2). This new highquality evidence has changed Recommendation 26 from ‘‘for most patients with thyroid cancer’’ to ‘‘for patients with thyroid cancer larger than 1 cm, the initial procedure should be a near-total or total thyroidectomy.’’ This is clear and evidence based and closes the debate between total thyroidectomy and lobectomy for thyroid carcinoma. Another major modification in the new Guidelines concerns the central compartment (level VI) neck dissection for papillary thyroid carcinoma. The current guidelines are more explicit in the distinction between prophylactic neck dissection (for patients clinically and radiologically N0) and therapeutic neck dissection (for patients cN1) and their respective indications. Recommendation 27a and 28 together state that central and lateral neck dissection should be performed for patients with clinically involved central or lateral neck nodes. This clear recommendation is based on accumulated evidence that therapeutic neck dissection may improve loco-regional control, decrease the need for repeated treatment with radioiodine, and may improve survival. Prophylactic neck dissection poses a problem. The risk to benefit ratio is difficult to evaluate given current evidence and conflicting data. There is no level I evidence that prophylactic central compartment neck dissection improves loco-regional control or disease-specific survival (3). Prophylactic central compartment neck dissection was shown in one study to increase the proportion of disease-free patients as documented by unmeasurable thyroglobulin levels postoperatively (4), but other similar studies have failed to show this advantage. There seem to be, nonetheless, advantages to performing a prophylactic central compartment neck dissection, and the new Guidelines have included a lengthier discussion with more data concerning its risks and benefits. The new Guidelines clearly state that intraoperative inspection of the central compartment is not a sensitive procedure for detecting metastatic nodes, a notion that is not new (5) and that exists for other head and neck cancers as well, but that seems to not have had any practical consequences for a number of surgeons. The limits of ultrasound detection in the central compartment are also clearly stated and are related to the small size of metastatic nodes; the difficult access to the region due to its small size, adjacent bones, and trachea; and the operatordependent nature of ultrasound itself. Lymph node staging using sentinel node biopsy has not been validated for thyroid cancer. It is apparent that currently the best procedure for obtaining a precise nodal staging is prophylactic lymph node dissection. The advantage of precise staging for low-risk patients has been shown in a recent study of patients with tumors less than 2 cm: the decision for adjuvant treatment with radioiodine was modified by the presence or absence of lymph node metastases for 30% of the 82 patients with pT1 tumors (6). Prophylactic central neck dissection may reveal more aggressive tumors than suspected, upstaging some patients (about 15% of the T1 tumors in the above study) and providing evidence in favor of radioiodine therapy for these selected cases. On the other hand, radioiodine was avoided for another 15% of the cases in the above study, due to negative pathology on analysis of the central compartment neck dissection. Avoiding radioiodine in low-risk patients avoids excess risk such as alterations in salivary and gonadal function or radio-induced cancers. According to the new Guidelines, radioiodine may or may not be indicated for patients with T1 or T2 tumors (Table 5 and
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