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The thyroid risk score (TRS) for nodules with indeterminate cytology

Colombo, C.; Muzza, M.; Pogliaghi, G.; Palazzo, S.; Vannucchi, G.; Vicentini, L.; Persani, L.; Gazzano, G.; Fugazzola, L.

Endocrine-Related Cancer 28(4): 225-235

2021

ISSN/ISBN: 1479-6821
PMID: 33640868
Accession: 079116874

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Summary
Cytology is the gold standard method for the differential diagnosis of thyroid nodules, though 25-30% of them are classified as indeterminate. We aimed to set up a 'thyroid risk score' (TRS) to increase the diagnostic accuracy in these cases. We prospectively tested 135 indeterminate thyroid nodules. The pre-surgical TRS derived from the sum of the scores assigned at cytology, EU-TIRADS classification, nodule measurement, and molecular characterization, which was done by our PTC-MA assay, a customized array able to cost-effectively evaluate 24 different genetic alterations including point mutations and gene fusions. The risk of malignancy (ROM) increased paralleling the score: in the category >4 and ≤ 6 (low suspicion), >6 ≤ 8 (intermediate suspicion), and >8 (high suspicion); ROM was 10, 47 and 100%, respectively. ROC curves selected the score >6.5 as the best threshold to differentiate between malignant and benign nodules (P < 0.001). The TRS > 6.5 had a better performance than the single parameters evaluated separately, with an accuracy of 77 and 82% upon inclusion of noninvasive follicular thyroid neoplasm with papillary-like nuclear features among malignant or benign cases, respectively. In conclusion, for the first time, we generated a score combining a cost-effective molecular assay with already validated tools, harboring different specificities and sensitivities, for the differential diagnosis of indeterminate nodules. The combination of different parameters reduced the number of false negatives inherent to each classification system. The TRS > 6.5 was highly suggestive for malignancy and retained a high accuracy in the identification of patients to be submitted to surgery.

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