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68Ga-DOTATOC PET/CT in Patients with Iodine- and 18F-FDG-Negative Differentiated Thyroid Carcinoma and Elevated Serum Thyroglobulin. | LitMetric

AI Article Synopsis

Article Abstract

Unlabelled: This study evaluated the impact of Ga-DOTATOC PET/CT in detecting recurrence or metastases in differentiated thyroid carcinoma (DTC) patients with elevated serum thyroglobulin and both negative radioiodine imaging and negative F-FDG PET/CT.

Methods: Ga-DOTATOC PET/CT (CT without contrast, low-dose) was performed on average 6 wk after negative F-FDG PET/CT (CT contrast-enhanced, full-dose) in 15 consecutive radioiodine-negative DTC patients with elevated and rising thyroglobulin. Visual assessment of Ga-DOTATOC PET/CT images used a 4-point scale for classification of lesions (0, no pathologic findings; 1, benign; 2, equivocal; 3, malignant). PET findings were correlated with the histologic subtype of tumor, levels of serum thyroglobulin, and morphologic findings on full-dose CT and neck ultrasound. Histology or clinical and imaging follow-up served as a reference standard. Analysis was performed on a patient and lesion basis.

Results: Ga-DOTATOC PET/CT was true-positive in 5 patients (10 tumor lesions) and was false-positive in 1 patient. The rate of positive Ga-DOTATOC PET/CT was significantly higher in poorly differentiated/oxyphilic carcinomas (4/4 patients) than in papillary (1/5) or follicular (0/6) tumors. Thyroglobulin levels tended to be higher in patients with tumor localization on Ga-DOTATOC PET/CT, but differences were not significant. In 2 of 5 patients with true-positive findings on Ga-DOTATOC PET/CT, CT alone but not ultrasound identified 2 of 10 tumor lesions, but in both patients Ga-DOTATOC-PET/CT revealed further tumor lesions not detected on CT alone.

Conclusion: Ga-DOTATOC PET/CT should be considered in the case of negative F-FDG PET/CT in radioiodine-negative DTC patients with elevated and rising thyroglobulin. Imaging with Ga-DOTATOC appears promising especially in poorly differentiated and oxyphilic subtypes of DTC.

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http://dx.doi.org/10.2967/jnumed.115.171942DOI Listing

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