Noninvasive follicular thyroid neoplasm with papillary-like nuclear features

Endocr Relat Cancer. 2016 Dec;23(12):893-897. doi: 10.1530/ERC-16-0379. Epub 2016 Sep 22.

Abstract

Recently, it was proposed that some papillary thyroid carcinomas (PTC) will no longer be termed 'cancer' and are christened as 'noninvasive follicular thyroid neoplasm with papillary-like nuclear features' (NIFTP). As this is a recent definition, little information is available about NIFTP. The objective of this study was to report the frequency, ultrasonographic appearance, cytology result and long-term evolution of cases of NIFTP seen at our institution. We excluded tumours ≤1 cm. The sample consisted of 129 patients. Sixty-four patients were submitted to total thyroidectomy and 65 to lobectomy. These patients with NIFTP did not receive radioiodine. NIFTP corresponded to 15% of cases diagnosed as PTC >1 cm. An ultrasonographic appearance considered to be of low suspicion for malignancy was common in NIFTP (32.5%), whereas a highly suspicious appearance was uncommon (5%). NIFTP frequently exhibited indeterminate cytology (62%), while malignant cytology was uncommon (4%). The patients were followed up for 12-146 months (median 72 months) after surgery. None of the patients developed structural disease during follow-up. Comparing the concentrations of thyroglobulin (Tg) and anti-Tg antibodies (TgAb) obtained 6-12 months after surgery and in the last assessment, none of the patients exhibited an increase in these markers.

Keywords: NIFTP; cytology; long-term; noninvasive encapsulated follicular variant; ultrasonography.

MeSH terms

  • Adenocarcinoma, Follicular / diagnosis
  • Adenocarcinoma, Follicular / pathology*
  • Adenocarcinoma, Follicular / surgery
  • Adolescent
  • Adult
  • Aged
  • Biopsy, Fine-Needle
  • Carcinoma, Papillary / diagnosis
  • Carcinoma, Papillary / pathology*
  • Carcinoma, Papillary / surgery
  • Disease Progression
  • Female
  • Follow-Up Studies
  • Humans
  • Male
  • Middle Aged
  • Neoplasms, Complex and Mixed / diagnosis
  • Neoplasms, Complex and Mixed / pathology*
  • Neoplasms, Complex and Mixed / surgery
  • Retrospective Studies
  • Thyroid Cancer, Papillary
  • Thyroid Neoplasms / diagnosis
  • Thyroid Neoplasms / pathology*
  • Thyroid Neoplasms / surgery
  • Thyroidectomy
  • Tumor Burden
  • Ultrasonography
  • Young Adult