EVALUATION OF THE HER2/NEU EXPRESSION IN THE TISSUE OF METASTATIC AXILLARY LYMPH NODES IN BREAST CANCER PATIENTS USING THE [99mTs]TC-(HE)3-G3

Abstract

Anatomical visualization and molecular typing of tumor tissue of regional metastatic lymph nodes (mALN) in patients with breast cancer, it is an important clinical problem in modern oncology. According to the results of previous studies, the [99mTc]Tc-(HE)3-G3 has proven itself as a promising diagnostic agent that allows differentiating the status of the HER2/neu receptor of a primary breast tumor (p0.05, Mann-Whitney test). In this regard, the purpose of this study is to explore the possibilities of using [99mTc]Tc-(HE)3-G3 to type the status of HER2/neu in patients with breast cancer. The study was conducted on clinical material including 20 patients with breast cancer (T2-4N1-3M0-1) before the systemic therapy (10 patients with overexpression of HER2/neu in metastases of axillary lymph nodes and 10 patients with negative) who underwent SPECT/CT scan 4 hours after injection of [99mTc]Tc-(HE)3-G3. Morphological and immunohistochemical studies of tumor tissue of metastatic axillary lymph nodes were performed in all patients with an assessment of HER2/neu status. Based on the results of our analysis, we found that the use of the mALN -to-contralateral and mALN-to-LDMratios 4 hours after injection of [99mTc]Tc-(HE)3-G3 should be considered for typing the status of HER2/neu in mALN in breast cancer patients (p0.05, Mann-Whitney test). At the same time, for the low/background parameter, the sensitivity and specificity indicators were 80% with a threshold value 12.25.