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Impact of Minimal Extra-Thyroid Extension in Differentiated Thyroid Cancer: Systematic Review and Meta-analysis

Talia Diker-Cohen1,2,3, Dania Hirsch1,3, Ilan Shimon1,3

  • 1Institute of Endocrinology, Diabetes and Metabolism, Rabin Medical Center, Petah-Tikva, Israel.

The Journal of Clinical Endocrinology and Metabolism
|March 6, 2018
PubMed
Abstract

Insights

Minimal extra-thyroid extension (mETE) in differentiated thyroid cancer (DTC) increases recurrence risk, though the absolute increase is small. This finding suggests mETE may not significantly alter tumor staging or impact disease-related mortality in DTC patients.

Area of Science:

  • Endocrinology
  • Oncology
  • Surgical Pathology

Background:

  • Differentiated thyroid cancer (DTC) staging traditionally considers minimal extra-thyroid extension (mETE) an intermediate risk factor.
  • Controversy exists regarding the clinical significance of mETE, with some studies questioning its impact on patient outcomes.

Purpose of the Study:

  • To evaluate the prognostic significance of mETE in differentiated thyroid cancer.
  • To determine the effect of mETE on recurrence risk and disease-related mortality in DTC patients.

Main Methods:

  • A meta-analysis was conducted on 13 retrospective studies comprising 23,816 DTC patients.
  • Comparative analysis focused on recurrence risk and mortality between patients with and without mETE, with a median follow-up of 86 months.

Main Results:

  • mETE was associated with an increased risk of recurrence in both N0 (OR 1.73) and N1/N0 disease (OR 1.82) cohorts.
  • The absolute risk of recurrence increased from 2.2% to 3.5% in N0 disease and from 6.2% to 7% in N1/N0 disease.
  • Minimal ETE did not significantly impact disease-related mortality (OR 0.5) and showed non-significant impact in micro-papillary carcinoma.

Conclusions:

  • Minimal extra-thyroid extension (mETE) is linked to a higher recurrence risk in differentiated thyroid cancer (DTC).
  • Despite the increased risk, the absolute increase is modest, and mETE does not appear to affect disease-related mortality.
  • The findings suggest that mETE may not warrant a change in tumor staging for DTC.

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