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Intraoperative Margin Assessment in Head and Neck Cancer: A Case of Misuse and Abuse?

  • Proceeding of the North American Society of Head and Neck Pathology Companion Meeting, March 1, 2020, Los Angeles, California
  • Published:
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Abstract

Surgical removal with negative margins is the preferred management of oral squamous cell carcinomas. This review summarizes statements by professional organizations and data supporting the specimen-driven approach to margin assessment. Practical aspects of the intraoperative margin assessment, as guided by gross examination, are presented. The most cost- and time-efficient method of intraoperative margin assessment depends on desired margin clearance and likelihood of other adverse histologic factors, such as extranodal extension, perineural invasion, which are likelier in advanced carcinomas. Intraoperative surgeon-pathologist communication can be improved by reporting to surgical team gross distances to all or selected closest margins, before choosing margins for microscopic frozen examination. Case specific mitigation strategies to minimize the negative impact of tumor-bed driven margin assessment or of suboptimal margin revision are proposed. Based on size, shape, histology, size of carcinoma at the margin, and orientation of the additional tissue, margin revision may be judged as adequate (conversion of a positive margin into a negative one), inadequate (positive margin remains positive), or indeterminate. The significance of anatomic subsite based labeling, radial margin sampling from the main resection specimen, and the relationship between the distance to closest margin and local control are highlighted. The modern definition of safe margin would account for other parameters, such as perineural invasion. An updated approach to resolution of frozen versus permanent sampling issues is outlined. Future studies are needed to design and validate risk models that would help to determine for individual patient what represents a safe margin and how to judge the quality of margin revision.

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source paper illustrates curves for local recurrence, too. Model-derived estimated probability of 3-year locoregional recurrence-free survival is plotted against the distance to closest margin and perineural invasion status. The presented curve functions like a nomogram. For instance, a patient with a closest margin of about 1 mm and positive for perineural invasion would have an estimated probability of 3-year locoregional recurrence free survival of about 0.7 (probability of recurrence at 30%). Arrows illustrate how referencing for individual patients can be done. A black vertical arrow is drawn from the point corresponding to the distance to closest margin on axis “x” until the line crosses the orange Kaplan–Meier curve (with PNI). From this point on Kaplan–Meier curve, horizontal black arrow towards the “y” axis will point out the estimated probability of 3-year locoregional recurrence free survival

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Correspondence to Simion I. Chiosea.

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Kubik, M.W., Sridharan, S., Varvares, M.A. et al. Intraoperative Margin Assessment in Head and Neck Cancer: A Case of Misuse and Abuse?. Head and Neck Pathol 14, 291–302 (2020). https://doi.org/10.1007/s12105-019-01121-2

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  • DOI: https://doi.org/10.1007/s12105-019-01121-2

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