title: Treatment monitoring with 18F-FDG PET in metastatic thymoma after 90Y-Dotatoc and selective internal radiation treatment (SIRT).
abstract: A 39 years old male patient with a history of an unresectable thymoma and synchronous liver metastases was referred tor our position. The patient had been originally treated with systemic chemotherapy followed by imatinib (Glivec) and sunitinib (Sutent). Since the therapeutic response was unsatisfactory, a gallium-68 ((68)Ga)-Dotatoc-positron emission tomography (PET) was performed and demonstrated an enhanced SSTR 2 expression in the primary tumor but not in the liver metastases. Three cycles of yttrium-90 ((90)Y)-Dotatoc were then administered. Outcome after treatment was monitored by (18)F-FDG-PET and CT and showed a response only of the primary tumor. Selective internal radiation treatment (SIRT) with (90)Y microspheres was then applied for the liver metastases. (18)F-FDG uptake showed that metabolism in the liver metastases decreased after SIRT. MRI of the liver demonstrated a decrease in vascularization and a modest decrease in tumor volume. Therefore, surgical resection of the primary thymoma was initiated.
authors: Clinical Cooperation Unit Nuclear Medicine, German Cancer Research Center, Heidelberg, Germany.
authors: Julie
authors: J
authors: Vasamiliette
authors: Peter
authors: P
authors: Hohenberger
authors: Stefan
authors: S
authors: Schoenberg
authors: Steffen
authors: S
authors: Diehl
authors: Dietmar J
authors: DJ
authors: Dinter
authors: Alexander
authors: A
authors: Marx
authors: Philipp
authors: P
authors: Stroebel
authors: Ludwig G
authors: LG
authors: Strauss
authors: Antonia
authors: A
authors: Dimitrakopoulou-Strauss
mesh_terms: D000328:Adult; D019788:Fluorodeoxyglucose F18; D006801:Humans; D008113:Liver Neoplasms / Q000000981:diagnostic imaging / Q000556:secondary* / Q000628:therapy*; D008297:Male; D049268:Positron-Emission Tomography / Q000379:methods*; D011379:Prognosis; D019275:Radiopharmaceuticals / Q000627:therapeutic use; D013945:Thymoma / Q000000981:diagnostic imaging / Q000556:secondary* / Q000628:therapy*; D013964:Thyroid Neoplasms / Q000000981:diagnostic imaging* / Q000628:therapy*; D016896:Treatment Outcome
chemical_list: D019275:Radiopharmaceuticals; D019788:Fluorodeoxyglucose F18