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Role of 68Ga-DOTATOC PET/CT in initial evaluation of patients with suspected bronchopulmonary carcinoid

  • Balasubramanian Venkitaraman
  • Sellam Karunanithi
  • Arvind Kumar
  • G. C. Khilnani
  • Rakesh Kumar
Original Article

Abstract

Purpose

The objective of this study was to evaluate the role of 68Ga-DOTATOC positron emission tomography (PET)/CT scan in patients with suspected pulmonary carcinoid tumour and to compare its results with 18F-fluorodeoxyglucose (FDG) PET/CT scan.

Methods

In this prospective study, 32 patients (age 34.22 ± 12.03 years; 53.1 % female) with clinical suspicion of bronchopulmonary carcinoid were evaluated with 68Ga-DOTATOC PET/CT and 18F-FDG PET/CT. The two imaging modalities were compared, considering the tissue diagnosis as the reference standard.

Results

Based on the reference standard 26 cases were carcinoid tumours [21 typical carcinoids (TC) and 5 atypical carcinoids (AC)] and 6 cases were non-carcinoid tumours. The sensitivity, specificity and accuracy of 68Ga-DOTATOC PET/CT in the diagnosis of pulmonary carcinoid tumour were 96.15, 100 and 96.87 % respectively, whereas those of 18F-FDG PET/CT were 78.26, 11.1 and 59.37 % respectively. The maximum standardised uptake value (SUVmax) of TC on 68Ga-DOTATOC PET/CT scan ranged from 3.58 to 55, while that of AC ranged from 1.1 to 32.5. 18F-FDG PET/CT was true-positive in all cases of AC and false-negative in eight cases of TC (sensitivity for TC 61.9 % and for AC 100 %).

Conclusion

68Ga-DOTATOC PET/CT is a useful imaging investigation for the evaluation of pulmonary carcinoids. 18F-FDG PET/CT scan suffers from low sensitivity and specificity in differentiating the pulmonary carcinoids from other tumours.

Keywords

Bronchopulmonary Carcinoid 68Ga-DOTATOC 18F-FDG 

Notes

Funding

No financial assistance/grant was received for this study.

Conflicts of interest

None.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Balasubramanian Venkitaraman
    • 1
  • Sellam Karunanithi
    • 2
  • Arvind Kumar
    • 1
  • G. C. Khilnani
    • 3
  • Rakesh Kumar
    • 2
  1. 1.Department of SurgeryAll India Institute of Medical SciencesNew DelhiIndia
  2. 2.Department of Nuclear MedicineAll India Institute of Medical SciencesNew DelhiIndia
  3. 3.Department of Pulmonary MedicineAll India Institute of Medical SciencesNew DelhiIndia

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