99mTc-DARPinG3 SPECT/CT for Non-invasive HER2-AX in Breast Cancer With Metastatic Lymph Nodes Before Targeted Therapy

Completed

• Conditions: Breast Cancer Female

• Registration Number: NCT05695859
• Lead Sponsor: Tomsk National Research Medical Center of the Russian Academy of Sciences

Brief Summary

An open-label, single center study with 99mTc-DARPinG3 SPECT/CT and biopsies of primary tumour and metastatic lymph nodes in breast cancer patients, where the primary endpoint of the study is to find out the correlation between the HER2 expression measured by 99mTc-DARPinG3 SPECT/CT and standard histopathology from relevant tumor and lymph node biopsies.

Detailed Description

Overall goal of the project: To determine HER2 expression level in primary breast cancer and axillary lymph node metastases before chemo/targeted therapy.

Study Timeline

• Study Start: 2022-12-20
• Study First Submitted: 2023-01-13
• Study First Submitted QC: 2023-01-13
• Study First Posted: 2023-01-25
• Primary Completion: 2023-12-01
• Study Completion: 2023-12-01
• Status Verified: 2024-02
• Last Update Submitted: 2024-02-29
• Last Update Posted: 2024-03-01

Recruitment & Eligibility

• Status: COMPLETED
• Sex: Female
• Target Recruitment: 24

Inclusion Criteria

• Subject is > 18 years of age
• Diagnosis of primary breast cancer with lymph node metastases
• Availability of results from HER2 status previously determined on material from the primary tumor and metastatic LN, either a. HER2-positive, defined as a DAKO HercepTest™ score of 3+ or FISH positive or b. HER2-negative, defined as a DAKO HercepTest™ score of 0 or 1+; or else if 2+ then FISH negative
• Hematological, liver and renal function test results within the following limits: White blood cell count: > 2.0 x 109/L; Hemoglobin: > 80 g/L; Platelets: > 50.0 x 109/L; ALT, ALP, AST: =< 5.0 times Upper Limit of Normal; Bilirubin =< 2.0 times Upper Limit of Normal; Serum creatinine: Within Normal Limits.
• A negative pregnancy test for all patients of childbearing potential. Sexually active women of childbearing potential participating in the study must use a medically acceptable form of contraception for at least 30 days after study termination
• Subject is capable to undergo the diagnostic investigations to be performed in the study
• Informed consent

Exclusion Criteria

• Any system therapy (chemo-/targeted therapy)
• Second, non-breast malignancy
• Active current autoimmune disease or history of autoimmune disease
• Active infection or history of severe infection within the previous 3 months (if clinically relevant at screening) 4. Known HIV positive or chronically active hepatitis B or C
• Administration of other investigational medicinal product within 30 days of screening
• Ongoing toxicity > grade 2 from previous standard or investigational therapies, according to US National Cancer Institute's

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
SPECT/CT-based 99mTc-DARPinG3 uptake value in metastatic lymph nodes	4 hours	SPECT/CT-based 99mTc-DARPinG3 uptake value in metastatic lymph nodes (counts)/SUV of 99mTc-DARPinG3 focal uptake coinciding with tumor lesions is assessed using SPECT/CT at 4 hours after injection and measured in counts and SUV
Tumor-to-background ratio (SPECT)	4 hours	The SPECT-based tumor-to-background ratio will be calculated as follows: the value of 99mTc-DARPinG3 uptake coinciding with tumor lesions (counts/SUV) will be divided by the value of 99mTc-DARPinG3 uptake coinciding with the regions without pathological findings (counts/SUV)
SPECT/CT-based 99mTc-DARPinG3 uptake in tumor lesions	4 hours	SPECT/CT-based 99mTc-DARPinG3 uptake value in tumor lesions (counts)/SUV of 99mTc-DARPinG3 focal uptake coinciding with tumor lesions is assessed using SPECT/CT at 4 hours after injection and measured in counts and SUV
LN-to-background LN ratio (SPECT)	4 hours	The SPECT-based LN-to-background LN ratio will be calculated as follows: the value of 99mTc-DARPinG3 uptake coinciding with LN lesions (counts/SUV) will be divided by the value of 99mTc-DARPinG3 uptake coinciding with the regions without pathological findings (counts/SUV)

Secondary Outcome Measures

Name	Time	Method
Morphological and immunohistochemical verification of 99mTc-DARPinG3 accumulation	4 hours	Comparison of the 99mTc-DARPinG3 accumulation in the primary tumor and metastatic lymph nodes with the results of morphological and immunohistochemical studies

Trial Locations

Locations (1)

Russia Tomsk NRMC; 🇷🇺 Tomsk, Russian Federation