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Noninvasive Follicular Thyroid Neoplasm with Papillary-Like Nuclear Features is Rare: A Population Based Study of Incidence

Abstract

The renaming of encapsulated follicular variant of papillary thyroid carcinoma (EFVPTC) to noninvasive follicular thyroid neoplasm with papillary-like nuclear features (NIFTP) was proposed by a group of experts in 2016 to prevent overtreatment of indolent, low-risk thyroid cancers. The aim of this study was to estimate the incidence and outcome for patients meeting the NIFTP criteria in a well-defined geographic region. Our cohort consisted of 134 patients with papillary thyroid carcinoma from the Region of Southern Denmark (RSD), 2007 to 2011. Patients were retrieved from the Danish Thyroid Cancer (DATHYRCA) Database. All potential NIFTP cases were reviewed by a thyroid pathologist. We identified no cases meeting all diagnostic criteria, but one probable NIFTP case from 2007 to 2011. The patient was treated according to the national guidelines and is alive and recurrence-free after 106 months of follow-up. Molecular testing showed KRAS mutation. In a population based set up the incidence rate of NIFTP is very low.

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Acknowledgements

We thank the Odense University Hospital, DAHANCA, Hans Skouby fond, and Kong Christian den Tiendes Fond.

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Correspondence to Rasmus H. Reinke.

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Reinke, R.H., Larsen, S.R., Mathiesen, J.S. et al. Noninvasive Follicular Thyroid Neoplasm with Papillary-Like Nuclear Features is Rare: A Population Based Study of Incidence. Head and Neck Pathol 14, 144–149 (2020). https://doi.org/10.1007/s12105-019-01032-2

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Keywords

  • NIFTP
  • Incidence
  • Thyroid
  • DATHYRCA
  • Follicular variant of papillary thyroid carcinoma