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Updated: May 7, 2026
A Practical Guide for the Production and PET/CT Imaging of 68Ga-DOTATATE for Neuroendocrine Tumors in Daily Clinical Practice
Published on: April 17, 2019
Neuroendocrine tumor recurrence: diagnosis with 68Ga-DOTATATE PET/CT
Alexander R Haug1, Ramona Cindea-Drimus, Christoph J Auernhammer
1From the Department of Nuclear Medicine (A.R.H., R.C., B.W., C.U., P.B., M.H.), Interdisciplinary Center of Neuroendocrine Tumors of the Gastro-Entero-Pancreatic System (A.R.H., C.J.A., C.S., P.B.), Department of Internal Medicine 2 (C.J.A., C.S.), Medizinische Klinik und Poliklinik 4 (M.R., F.B.), and Institute of Clinical Radiology (G.P.S.), Klinikum Grosshadern, Ludwig-Maximilians-University of Munich, Marchioninistrasse 15, Munich 81377, Germany; and Department of Nuclear Medicine, Medical University of Vienna, Vienna, Austria (M.H.).
Gallium 68-DOTATATE PET/CT accurately detects recurrent neuroendocrine tumors (NETs). Clinical information is crucial for interpreting results, as blinded reviews reduced diagnostic sensitivity for NET recurrence.
Area of Science:
- Nuclear Medicine
- Oncology
- Radiology
Background:
- Neuroendocrine tumors (NETs) require sensitive follow-up after curative resection.
- Recurrent NETs can be challenging to detect using conventional methods.
- (68)Ga-DOTATATE positron emission tomography (PET)/computed tomography (CT) is a molecular imaging technique.
Purpose of the Study:
- To evaluate the diagnostic performance of (68)Ga-DOTATATE PET/CT for detecting recurrent NETs.
- To assess the sensitivity, specificity, and accuracy of (68)Ga-DOTATATE PET/CT in identifying NET recurrence.
- To determine the impact of clinical information on the interpretation of (68)Ga-DOTATATE PET/CT scans.
Main Methods:
- Retrospective analysis of 63 patients who underwent (68)Ga-DOTATATE PET/CT after primary NET resection.
- Scans were interpreted by two readers with and without blinding to clinical data.
- Diagnostic performance metrics including sensitivity, specificity, PPV, and NPV were calculated.
- Final diagnosis was confirmed by histopathology or clinical follow-up.
Main Results:
- (68)Ga-DOTATATE PET/CT demonstrated 90% sensitivity and 82% specificity in detecting NET recurrence.
- Overall accuracy was 86%, with a positive predictive value (PPV) of 81% and a negative predictive value (NPV) of 90%.
- For gastroenteropancreatic NETs, sensitivity was 94% and specificity was 89%.
- Blinded review by readers decreased sensitivity to 79% and 76% but maintained high specificity (85%-94%).
Conclusions:
- (68)Ga-DOTATATE PET/CT is an accurate imaging modality for detecting recurrent NETs.
- The significant decrease in sensitivity during blinded review highlights the importance of integrating clinical information for accurate NET recurrence diagnosis.
- Further validation is needed to establish (68)Ga-DOTATATE PET/CT in routine follow-up protocols for NET patients.
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