1. 68Ga-DOTATOC PET/CT to detect immune checkpoint inhibitor-related myocarditis.
- Author
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Boughdad, Sarah, Boughdad, Sarah, Latifyan, Sofiya, Fenwick, Craig, Bouchaab, Hasna, Suffiotti, Madeleine, Moslehi, Javid, Salem, Joe-Elie, Schaefer, Niklaus, Nicod-Lalonde, Marie, Costes, Julien, Perreau, Matthieu, Michielin, Olivier, Peters, Solange, Prior, John, Obeid, Michel, Boughdad, Sarah, Boughdad, Sarah, Latifyan, Sofiya, Fenwick, Craig, Bouchaab, Hasna, Suffiotti, Madeleine, Moslehi, Javid, Salem, Joe-Elie, Schaefer, Niklaus, Nicod-Lalonde, Marie, Costes, Julien, Perreau, Matthieu, Michielin, Olivier, Peters, Solange, Prior, John, and Obeid, Michel
- Abstract
BACKGROUND: Immune checkpoint inhibitor (ICI)-related myocarditis is a rare but potentially fatal adverse event that can occur following ICI exposure. Early diagnosis and treatment are key to improve patient outcomes. Somatostatin receptor-based positron emission tomography-CT (PET/CT) showed promising results for the assessment of myocardial inflammation, yet information regarding its value for the diagnosis of ICI-related myocarditis, especially at the early stage, is limited. Thus, we investigated the value of 68Ga-DOTA(0)-Phe(1)-Tyr(3)-octreotide (68Ga-DOTATOC) PET/CT for the early detection and diagnosis of ICI-related myocarditis. METHODS: Consecutive patients with clinically suspected ICI-related myocarditis from July 2018 to February 2021 were retrospectively evaluated in this single-center study. All patients underwent imaging for the detection of ICI-related myocarditis using either cardiac magnetic resonance (CMR) imaging or 68Ga-DOTATOC PET/CT. PET/CT images were acquired 90 min after the injection of 2 MBq/kg 68Ga-DOTATOC with pathological myocardial uptake in the left ventricle (LV) suggestive of myocarditis defined using a myocardium-to-background ratio of peak standard uptake value to mean intracavitary LV standard uptake (MBRpeak) value above 1.6. Patients had a full cardiological work-up including ECG, echocardiography, serum cardiac troponin I (cTnI), cardiac troponin T and creatine kinase (CK), CK-MB. Endomyocardial biopsy and inflammatory cytokine markers were also analyzed. The detection rate of ICI-related myocarditis using 68Ga-DOTATOC PET/CT and CMR was assessed. RESULTS: A total of 11 patients had clinically suspected ICI-related myocarditis; 9 underwent 68Ga -DOTATOC PET/CT. All nine (100%) patients with 68Ga-DOTATOC PET/CT presented with pathological myocardial uptake in the LV that was suggestive of myocarditis (MBRpeak of 3.2±0.8, range 2.2-4.4). Eight patients had CMR imaging and 3/8 (38%) patients had lesions evocative of myocarditis.
- Published
- 2021