CONTEXT: Noninvasive follicular thyroid neoplasm with papillary-like nuclear features (NIFTP) was introduced as a new entity replacing the diagnosis of noninvasive encapsulated follicular variant of papillary thyroid carcinoma (PTC). Significant variability in the incidence of NIFTP diagnosed in different world regions has been reported. OBJECTIVE: To investigate the rate of adoption of NIFTP, change in practice patterns, and uniformity in applying diagnostic criteria among pathologists practicing in different regions. METHODS: Two surveys distributed to pathologists of the International Endocrine Pathology Discussion Group with multiple-choice questions on NIFTP adoption into pathology practice and whole slide images of 5 tumors to collect information on nuclear score and diagnosis. Forty-eight endocrine pathologists, including 24 from North America, 8 from Europe, and 16 from Asia/Oceania completed the first survey and 38 the second survey. RESULTS: A 94% adoption rate of NIFTP by the pathologists was found. Yet, the frequency of rendering NIFTP diagnosis was significantly higher in North America than in other regions (P = .009). While the highest concordance was found in diagnosing lesions with mildly or well-developed PTC-like nuclei, there was significant variability in nuclear scoring and diagnosing NIFTP for tumors with moderate nuclear changes (nuclear score 2) (case 2, P < .05). Pathologists practicing in North America and Europe showed a tendency for lower thresholds for PTC-like nuclei and NIFTP than those practicing in Asia/Oceania. CONCLUSION: Despite a high adoption rate of NIFTP across geographic regions, NIFTP is diagnosed more often by pathologists in North America. Significant differences remain in diagnosing intermediate PTC-like nuclei and respectively NIFTP, with more conservative nuclear scoring in Asia/Oceania, which may explain the geographic differences in NIFTP incidence.

• MeSH
• buněčné jádro patologie   MeSH
• folikulární adenokarcinom * patologie   epidemiologie   diagnóza   MeSH
• lékařská praxe - způsoby provádění statistika a číselné údaje   MeSH
• lidé MeSH
• nádory štítné žlázy * epidemiologie   patologie   diagnóza   MeSH
• papilární karcinom štítné žlázy epidemiologie   patologie   diagnóza   MeSH
• papilární karcinom patologie   epidemiologie   diagnóza   MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• Geografické názvy
• Asie MeSH
• Evropa MeSH
• Oceánie MeSH
• Severní Amerika MeSH

• Klíčová slova
• folikulární karcinom,
• MeSH
• anaplastický karcinom štítné žlázy diagnóza   patofyziologie   MeSH
• genetické testování MeSH
• kalcitonin analýza   MeSH
• lidé MeSH
• medulární karcinom diagnóza   krev   patofyziologie   MeSH
• nádory štítné žlázy * diagnóza   epidemiologie   klasifikace   patofyziologie   patologie   MeSH
• papilární karcinom štítné žlázy diagnóza   epidemiologie   patofyziologie   patologie   MeSH
• stupeň nádoru MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• přehledy MeSH