131 I-GD2-ch14.18 Scintigraphy to Evaluate Option for Radioimmunotherapy in Patients with Advanced Tumors

The Journal of Nuclear Medicine

article

Ying Zhang¹  Juergen Kupferschlaeger¹  Peter Lang²  Gerald Reischl³  Rupert J. Handgretinger²  Christian la Fougère¹  Helmut Dittmann¹ 

[1] Department of Nuclear Medicine and Clinical Molecular Imaging, University Hospital Tuebingen;Clinic for Paediatric Hematology and Oncology, University Hospital Tuebingen;Department of Preclinical Imaging and Radiopharmacy, University Hospital Tuebingen;Cluster of Excellence iFIT ,(EXC 2180) “Image Guided and Functionally Instructed Tumor Therapies,” University of Tuebingen;German Cancer Consortium

关键词: 131I-GD2;    neuroblastoma;    dosimetry;    tumor dose;    radioimmunotherapy;   

DOI  :  10.2967/jnumed.120.261854

学科分类：医学（综合）

来源: Society of Nuclear Medicine

【 摘 要 】

The tumor-selective ganglioside antigene GD2 is frequently expressed on neuroblastomas and to a lesser extent on sarcomas and neuroendocrine tumors. The aim of our study was to evaluate the tumor targeting and biodistribution of 131I-labeled chimeric GD2-antibody clone 14/18 (131I-GD2-ch14.18) in patients with late-stage disease in order to identify eligibility for radioimmunotherapy. Methods: Twenty patients (neuroblastoma, n = 9; sarcoma, n = 9; pheochromocytoma, n = 1; and neuroendocrine tumor, n = 1) were involved in this study. A 21- to 131-MBq dose (1–2 MBq/kg) of 131I-GD2-ch14.18 (0.5–1.0 mg) was injected intravenously. Planar scintigraphy was performed within 1 h from injection (day 0) and on days 1, 2, 3, and 6 or 7 to analyze tumor uptake and tracer biodistribution. Serial blood samples were collected in 4 individuals. Absorbed dose to tumor lesions and organs was calculated using OLINDA software. Results: The tumor-targeting rate on a per-patient base was 65% (13/20), with 6 of 9 neuroblastomas showing uptake of 131I-GD2-ch14.18. Tumor lesions showed maximum uptake at 20–64 h after injection (effective half-life in tumors, 33–192 h). The tumor-absorbed dose varied between 0.52 and 30.2 mGy/MBq (median, 9.08 mGy/MBq; n = 13). Visual analysis showed prominent blood-pool activity up to day 2 or 3 after injection. No pronounced uptake was observed in the bone marrow compartment or in the kidneys. Bone marrow dose was calculated at 0.09–0.18 mGy/MBq (median, 0.12 mGy/MBq), whereas blood dose was 1.1–4.7 mGy/MBq. Two patients (1 neuroblastoma and 1 pheochromocytoma) with particularly high tumor uptake underwent radioimmunotherapy using 2.3 and 2.9 GBq of 131I-GD2-ch14.18, both achieving stable disease. Overall survival was 17 and 6 mo, respectively. Conclusion: 131I-GD2-ch14.18 is cleared slowly from blood, not resulting in good tumor-to-background contrast until 2 d after application. With acceptable red marrow and organ dose, radioimmunotherapy is an option for patients with high tumor uptake. However, because of the variable GD2 expression, the decision should depend on pretherapeutic dosimetry.

【 授权许可】

CC BY