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. 2024 Jun;84(3):812-821.
doi: 10.1007/s12020-024-03688-5. Epub 2024 Jan 24.

Prognostic role and characteristics of the indeterminate response in differentiated thyroid cancer: a systematic review

P Bellini  1 , F Dondi  2 , E Gatta  3 , V Zilioli  4 , D Albano  2 , C Cappelli  3 , F Bertagna  2
Affiliations

Prognostic role and characteristics of the indeterminate response in differentiated thyroid cancer: a systematic review

P Bellini et al. Endocrine. 2024 Jun.

Abstract

Purpose: The management of differentiated thyroid cancer (DTC) is actually based on a dynamic risk stratification based on classes of response to the therapy. Indeterminate response (IR) includes a heterogeneous group of patients with different characteristics, particularly different Tg and AbTg levels and/or imaging findings. The aim of systematic review (SR) is to evaluate the prognosis, diagnostic findings and other characteristics of patients in the IR class.

Methods: A wide literature search in the Scopus, PubMed/MEDLINE and Web of Science databases was performed to find published articles on patients with DTC and IR after treatment. The quality assessment of studies was carried out using QUADAS-2 evaluation.

Results: Eight articles were included in the systematic review. Six studies evaluated the prognosis and the prognostic factor in patients with IR, one study evaluated the role of 2-[18F]FDG PET-CT in the management of patients with IR and biochemical incomplete response and one study the risk factors for IR.

Conclusion: Patients with DTC and IR to therapy have a probability of disease relapse < 15%. Tg value could be a predictor of disease progression. The role of 2-[18F]FDG PET-CT needs to be further investigated.

Keywords: Indeterminate response; Systematic review; Thyroid cancer.

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