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Radionuclide imaging of HER2/neu expression in metastatic axillary lymph nodes in breast cancer patients: comparing the efficacy of [99mTc]Tc-ADAPT6 and [99mTc]Tc-(HE)3-G3

https://doi.org/10.20538/1682-0363-2025-1-14-21

Abstract

Aim. To conduct a direct comparative analysis of single-photon emission computed tomography (SPECT-CT) with [99mTc]Tc-ADAPT6 and [99mTc]Tc-(HE)3-G3 in patients with HER2-positive breast cancer (BC) with axillary lymph node metastases.
Materials and methods. The analysis included 8 patients with HER2-positive BC with axillary lymph node metastases before the systemic treatment. All patients were injected with [99mTc]Tc-ADAPT6 (500 µg) and [99mTc] Tc-(HE)3-G3 (3,000 µg) with an interval of 3–4 days. The SPECT-CT scans of the chest and upper abdomen were performed after 2 hours for [99mTc]Tc-ADAPT6 and after 4 hours for [99mTc]Tc-(HE)3-G3. The accumulation of radiopharmaceuticals was assessed by measuring the maximum standardized uptake values (SUVmax) in metastatic axillary lymph nodes, projections of the contralateral axillary lymph nodes, liver, latissimus dorsi muscle, and spleen. Additionally, mALN-to-background and mALN-to-reference organs ratios were calculated for each patient.
Results. Comparison of the mALN-to-background ratio revealed the advantage of [99mTc]Tc-ADAPT6 (38.93 (16.56–56.02)) over [99mTc]Tc-(HE)3-G3 (19.39 (8.43–34.52)), p = 0.0391. The comparative analysis of the accumulation of the studied radiopharmaceuticals in the reference organs demonstrated higher SUVmax for [99mTc] Tc-(HE)3 -G3 in the liver and spleen (4.44 (2.85–9.08) and 2.47 (1.28–4.41), respectively) than for [99mTc]Tc-ADAPT6 (2.98 (1.96–3.65) and 0.43 (0.14–0.62), respectively), p = 0.01 and p = 0.04. Comparison of the SUVmax ratios in mALN and reference organs showed higher values of mALN / spleen for [99mTc]Tc-ADAPT6 (5.93 (1.04–11.85)) compared to [99mTc]Tc-(HE)3-G3 (1.83 (0.46–4.54)), p = 0.02. Conclusion. According to the results of the performed analysis, the diagnostic advantage of [99mTc]Tc-ADEPT6 for the detection of) HER2/neu expression in metastatic lymph nodes in breast cancer patients was revealed.

About the Authors

О. D. Bragina
Cancer Research Institute, Tomsk National Research Medical Center (Russian Academy of Sciences); National Research Tomsk Polytechnic University (NR TPU)
Russian Federation

5, Kooperativny Str., Tomsk, 634009;
30, Lenina Av., Tomsk, 634050


Competing Interests:

The authors declare the absence of obvious or potential conflict of interest related to the publication of this article.



L. А. Tashireva
Cancer Research Institute, Tomsk National Research Medical Center (Russian Academy of Sciences)
Russian Federation

5, Kooperativny Str., Tomsk, 634009


Competing Interests:

The authors declare the absence of obvious or potential conflict of interest related to the publication of this article.



Е. Yu. Garbukov
Cancer Research Institute, Tomsk National Research Medical Center (Russian Academy of Sciences)
Russian Federation

5, Kooperativny Str., Tomsk, 634009


Competing Interests:

The authors declare the absence of obvious or potential conflict of interest related to the publication of this article.



М. А. Vostrikova
Cancer Research Institute, Tomsk National Research Medical Center (Russian Academy of Sciences)
Russian Federation

5, Kooperativny Str., Tomsk, 634009


Competing Interests:

The authors declare the absence of obvious or potential conflict of interest related to the publication of this article.



А. А. Romanova
Cancer Research Institute, Tomsk National Research Medical Center (Russian Academy of Sciences)
Russian Federation

5, Kooperativny Str., Tomsk, 634009


Competing Interests:

The authors declare the absence of obvious or potential conflict of interest related to the publication of this article.



S. М. Deyev
National Research Tomsk Polytechnic University (NR TPU); Shemyakin – Ovchinnikov Institute of Bioorganic Chemistry of the Russian Academy of Sciences; National Research Center «Kurchatov Institute»
Russian Federation

30, Lenina Av., Tomsk, 634050;
16/10, Miklukho – Maklaya Str., Moscow, 117997;
1, Akademika Kurchatova Str., Moscow, 123098


Competing Interests:

The authors declare the absence of obvious or potential conflict of interest related to the publication of this article.



М. Е. Borodina
P. Hertsen Moscow Oncology Research Institute
Russian Federation

3, 2nd Botkinsky Proyezd Str., Moscow, 125284


Competing Interests:

The authors declare the absence of obvious or potential conflict of interest related to the publication of this article.



V. I. Chernov
Cancer Research Institute, Tomsk National Research Medical Center (Russian Academy of Sciences); National Research Tomsk Polytechnic University (NR TPU); National Research Center «Kurchatov Institute»
Russian Federation

5, Kooperativny Str., Tomsk, 634009;
30, Lenina Av., Tomsk, 634050;
1, Akademika Kurchatova Str., Moscow, 123098


Competing Interests:

The authors declare the absence of obvious or potential conflict of interest related to the publication of this article.



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Review

For citations:


Bragina О.D., Tashireva L.А., Garbukov Е.Yu., Vostrikova М.А., Romanova А.А., Deyev S.М., Borodina М.Е., Chernov V.I. Radionuclide imaging of HER2/neu expression in metastatic axillary lymph nodes in breast cancer patients: comparing the efficacy of [99mTc]Tc-ADAPT6 and [99mTc]Tc-(HE)3-G3. Bulletin of Siberian Medicine. 2025;24(1):14-21. https://doi.org/10.20538/1682-0363-2025-1-14-21

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ISSN 1682-0363 (Print)
ISSN 1819-3684 (Online)