Molecular Imaging of HER2-Expressing Malignant Tumors in Breast Cancer Patients Using Synthetic 111In- or 68Ga-Labeled Affibody Molecules

Journal of Nuclear Medicine

Christiane Schuchardt¹  Anders Wennborg¹  Vladimir Tolmachev¹  Richard P. Baum¹  Anna Orlova¹  Dirk Müller¹  Joachim Feldwisch¹  Vikas Prasad¹ 

关键词: diagnostic imaging;    breast cancer;    PET/CT;    ¹¹¹In;    ⁶⁸Ga;   

DOI  :  10.2967/jnumed.109.073239

学科分类：医学（综合）

来源: Society of Nuclear Medicine

【 摘 要 】

The clinical utility of a human epidermal growth factor receptor 2 (HER2)–targeting Affibody molecule for detection and characterization of HER2-positive lesions was investigated in patients with recurrent metastatic breast cancer. Methods: Three patients received 111In- or 68Ga-labeled DOTA0-ZHER2:342-pep2 (ABY-002). γ-Camera, SPECT, or PET/CT images were compared with earlier 18F-FDG PET/CT results. Results: Administration of radiolabeled ABY-002 was well tolerated. Blood kinetics of radiolabeled ABY-002 showed a first half-life of 4–14 min, second half-life of 1–4 h, and third half-life of 12–18 h. Radiolabeled ABY-002 detected 9 of 11 18F-FDG–positive metastases as early as 2–3 h after injection. Conclusion: Molecular imaging using 111In- or 68Ga-labeled ABY-002 has the potential to localize metastatic lesions in vivo, adds qualitative information not available today by conventional imaging techniques, and may allow the HER2 status to be determined for metastases not amenable to biopsy. To our knowledge, this is the first report on clinical imaging data obtained with a non–immunoglobulin-based scaffold protein.

【 授权许可】

Unknown