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CASE REPORT
Year : 2021  |  Volume : 20  |  Issue : 3  |  Page : 316-318

Everolimus-induced somatostatin receptor overexpression in a rectal neuroendocrine tumor patient may promote somatostatin receptor-guided radionuclide therapy (peptide receptor radiotherapy) as an additional treatment option


Department of Nuclear Medicine, Jules Bordet Institute, Université Libre de Bruxelles, Brussels, Belgium

Correspondence Address:
Dr. Magdalena Mileva
Department of Nuclear Medicine, Jules Bordet Institute - Université Libre de Bruxelles, Rue Héger-Bordet 1, B-1000, Barussels
Belgium
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DOI: 10.4103/wjnm.WJNM_120_20

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We present a case of Grade II, well-differentiated rectal neuroendocrine tumor in a 39-year-old patient. Following different sequential treatment modalities, the disease progressed both on metabolic (18F-fluorodeoxyglucose positron emission tomography-computed tomography [18F-FDG PET/CT]) and somatostatin receptor (SSTR)-imaging (68Ga-DOTA-Tyr3-octreotate [68Ga-DOTATATE] PET/CT), and the patient received three cycles of peptide receptor radiotherapy (PRRT). Two years later, upon new progression due to the appearance of metabolically active, 68Ga-DOTATATE PET/CT-negative liver lesions, targeted treatment with everolimus was introduced. Further morphologic and metabolic progression occurred 4 months after everolimus initiation, however, this time liver lesions demonstrated increased SSTR-expression on68Ga-DOTATATE PET/CT. Thus, the patient became eligible for a second PRRT course.


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