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Medullary Thyroid Carcinoma (MTC) Treated With 177 Lu-DOTATATE PRRT A Report of Two Cases William Makis, MD, Karey McCann, BScN, and Alexander J.B. McEwan, MD Abstract: Two patients diagnosed with metastatic medullary thyroid carcinoma (MTC) were referred for peptide receptor radionuclide therapy (PRRT) with 177 Lu-[DOTA0,Tyr3]octreotate (DOTATATE). Each patient was treated with 4 doses of 177Lu-DOTATATE given 2 months apart. One patient achieved stable disease for 10 months then chose to pursue surgery, and the other achieved stable disease for 9 months on imaging; however, calcitonin continued to rise. The use of 177Lu-DOTATATE PRRT therapy in the management of MTC warrants further research. Key Words: PRRT, 177Lu-DOTATATE, lutetium, medullary thyroid carcinoma, MTC, calcitonin, CEA, neuroendocrine tumor, NET (Clin Nucl Med 2015;40: 408–412)

Received for publication April 1, 2014; revision accepted December 10, 2014. From the Department of Diagnostic Imaging, Cross Cancer Institute, Edmonton, AB, Canada. Conflicts of interest and sources of funding: none declared. Reprints: William Makis, MD, Department of Diagnostic Imaging, Cross Cancer Institute, 11560 University Ave NW, Edmonton, AB, T6G 1Z2, Canada. E-mail: [email protected]. Copyright © 2015 Wolters Kluwer Health, Inc. All rights reserved. ISSN: 0363-9762/15/4005–0408

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Clinical Nuclear Medicine • Volume 40, Number 5, May 2015 Copyright © 2015 Wolters Kluwer Health, Inc. All rights reserved.

Clinical Nuclear Medicine • Volume 40, Number 5, May 2015

MTC Treated With 177Lu-DOTATATE PRRT

FIGURE 1. A 75-year-old man, diagnosed with MTC on biopsy, had a total thyroidectomy with neck dissection, revealing a right-sided 2.8-cm tumor with 18/37 positive neck nodes levels 1–5 and 7. There was residual disease on 111In-octreotide scan and he was treated with 4 cycles of 177Lu-DOTATATE of 150 mCi each, given 2 months apart. A, Post-first 177Lu-DOTATATE treatment scan showed intensely avid right paratracheal nodes (up to 1.6 cm) and mildly avid left supraclavicular nodes (up to 1.0 cm). B, Post-fourth treatment scan showed stable disease. Calcitonin decreased from 11,565 ng/L before surgery to 2895 ng/L pre-first treatment and 2517 ng/L post-fourth treatment (normal

Medullary thyroid carcinoma (MTC) treated with 177Lu-DOTATATE PRRT: a report of two cases.

Two patients diagnosed with metastatic medullary thyroid carcinoma (MTC) were referred for peptide receptor radionuclide therapy (PRRT) with Lu-[DOTA,...
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