The Molecular Landscape of Noninvasive Follicular Thyroid Neoplasm With Papillary-like Nuclear Features (NIFTP): A Literature Review
The encapsulated and noninvasive follicular variant of papillary thyroid carcinoma has been recently reclassified as noninvasive follicular thyroid neoplasm with papillary-like nuclear features (NIFTP). These tumors demonstrate indolent behavior. This change in nomenclature will have
great clinical impact by avoiding overtreatment of patients with NIFTP lesions who in the past were diagnosed with thyroid carcinoma and typically received completion thyroidectomy followed by radioactive iodine ablation. The pathologic diagnosis of NIFTP requires surgical removal of the thyroid
lesion or the lobe harboring it, and thorough sampling of the complete interface between the tumor capsule and the thyroid parenchyma, to exclude foci of invasion. From a cytologic point of view, the unequivocal differential diagnosis between NIFTP and infiltrative follicular variant of papillary
thyroid carcinoma in fine-needle aspiration is close to impossible based on cellular and architectural features. Therefore, use of adjunct molecular testing on fine-needle aspiration specimens may be essential for the preoperative diagnosis of low-risk tumors such as NIFTP for appropriate
patient management. This review discusses and summarizes the existing known literature on molecular characteristics of NIFTP tumors, so far reported, including cases retrospectively classified or prospectively diagnosed as NIFTP. Brief reference is also made to new and promising approaches
applicable to the diagnosis of this tumor.
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Document Type: Research Article
Department of Surgical, Medical, Molecular Pathology and Critical Area, University of Pisa
Unit of Pathological Anatomy, 3rd Division, University Hospital of Pisa, Pisa, Italy
Department of Pathology, Queen Alexandra Hospital, University of Portsmouth, Portsmouth, UK
Department of Pathology and Laboratory Medicine, Hospital of the University of Pennsylvania, Perelman School of Medicine, Philadelphia, PA
September 1, 2017