Detection of HER2 expression using 99mTc-NM-02 nanobody in patients with breast cancer: a non-randomized, non-blinded clinical trial
Lingzhou Zhao, Yan Xing, Changcun Liu, Shaofei Ma, Wenhua Huang, Zhen Cheng, Jinhua Zhao
Abstract
Abstract Background 99m Tc radiolabeled nanobody NM-02 ( 99m Tc-NM-02) is a novel single photon emission computed tomography (SPECT) probe with a high affinity and specificity for human epidermal growth factor receptor 2 (HER2). In this study, a clinical imaging trial was conducted to investigate the relationship between 99m Tc-NM-02 uptake and HER2 expression in patients with breast cancer. Methods Thirty patients with pathologically confirmed breast cancer were recruited and imaged with both 99m Tc-NM-02 SPECT/computed tomography (CT) and 18 F-fluorodeoxyglucose ( 18 F-FDG) positron emission tomography (PET)/CT. According to the treatment conditions before recruitment, patients were divided into two groups, the newly diagnosed group ( n = 24) and the treated group ( n = 6). The maximal standard uptake value (SUV max ) of 18 F-FDG and SUV max and mean SUV (SUV mean ) of 99m Tc-NM-02 in the lesions were determined to analyze the relationship with HER2 expression. Results No meaningful relationship was observed between 18 F-FDG uptake and HER2 expression in 30 patients with breast cancer. 99m Tc-NM-02 uptake was positively correlated with HER2 expression in the newly diagnosed group, but no correlation was observed in the treated group. 99m Tc-NM-02 uptake in HER2-positive lesions was lower in those with effective HER2-targeted therapy compared with the newly diagnosed group. 99m Tc-NM-02 SPECT/CT detected brain and bone metastases of breast cancer with a different imaging pattern from 18 F-FDG PET/CT. 99m Tc-NM-02 showed no non-specific uptake in inflamed tissues and revealed intra- and intertumoral HER2 heterogeneity by SPECT/CT imaging in 9 of the 30 patients with breast cancer. Conclusions 99m Tc-NM-02 SPECT/CT has the potential for visualizing whole-body HER2 overexpression in untreated patients, making it a promising method for HER2 assessment in patients with breast cancer. Trial registration NCT04674722, Date of registration: December 19, 2020.