Study of Factors Associated With Significant MYoCArdian Uptake on 68Ga-DOTATOC PET Scans for Oncology

Oncologic Disorders

Chemotherapy-related cardiovascular morbidity and mortality in cancer patients is a public health concern. Although several imaging techniques exist to prevent and monitor chemo-induced cardiotoxic effects, the lack of recommendation and consensus is a barrier to reducing cardiac adverse events in this population. PET/CT with Gallium-68 somatostatin analogues (68Ga-DOTATOC, 68Ga-DOTATATE...) is now part of the reference imaging of neuroendocrine tumors (pulmonary, gastrointestinal, pancreatic, pheochromocytoma / paraganglioma, medullary thyroid cancer...), allowing to evaluate their extension and to follow up. Their treatment, including a large arsenal of chemotherapy (etoposide, capecitabine, cisplatin, etc.), may cause cardiotoxicity, which is difficult to assess.

Chemotherapy-related cardiovascular morbidity and mortality in cancer patients is a public health concern. Although several imaging techniques exist to prevent and monitor chemo-induced cardiotoxic effects, the lack of recommendation and consensus is a barrier to reducing cardiac adverse events in this population. PET/CT with Gallium-68-labeled somatostatin analogues (68Ga-DOTATOC, 68Ga-DOTATATE...) is now part of the reference imaging of neuroendocrine tumors (pulmonary, gastrointestinal, pancreatic, pheochromocytoma/paraganglioma, medullary thyroid cancer...), allowing to evaluate their extension and to perform follow-up . Their treatment, including a large arsenal of chemotherapy (etoposide, capecitabine, cisplatin, etc.), may cause cardiotoxicity, which is difficult to assess. However, significant cardiac area uptake has been found on some 68Ga-DOTATOC PET/CT scans in oncology. This uptake could be related either to the patient's cardiac history (inflammatory atheromatous valvular and/or coronary lesions), some studies having shown the association between the uptake of a somatostatin analogue and the presence of calcified plaques, or to a possible chemo-induced cardiotoxicity which, to our knowledge, no study has investigated. Thus, the identification of 68Ga-DOTATOC binding patterns in the cardiac area in relation to chemo-induced cardiotoxicity would have the advantage of avoiding the multiplication of examinations in the initial and follow-up work-up, thus allowing the combined evaluation of the disease and the cardiac adverse effects induced by its treatments, and thus a better control of the cardio-induced morbidity and mortality of patients with a neuroendocrine tumor. The hypothesis of this study is that 68Ga-DOTATOC PET/CT scans with oncological indications sometimes show significant uptake in the cardiac area, which could be related to inflammatory atheromatous coronary/valvular lesions, or to a recent history of potentially cardiotoxic oncological treatments (or to diffuse somatic inflammation?)

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