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99mTc-Fanolesomab: affinity, pharmacokinetics and preliminary evaluation.

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The Quarterly Journal of Nuclear Medicine and Molecular Imaging : Official Publication of the Italian Association of Nuclear Medicine (AIMN) [And] the International Association of Radiopharmacology (IAR), [And] Section of the Society Of

|June 14, 2006

Summary

NeutroSpec, a technetium-99m labeled anti-CD15 monoclonal antibody, offers improved bacterial infection localization. It overcomes limitations of radiolabeled white blood cell imaging, providing a faster and more efficient diagnostic tool.

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Area of Science:

Nuclear Medicine
Immunology
Diagnostic Imaging

Background:

Accurate infection localization is crucial for effective diagnosis and treatment.
Traditional methods like radiolabeled leukocytes have drawbacks including cost and time-intensive procedures.
Development of novel imaging agents is essential to overcome existing diagnostic limitations.

Purpose of the Study:

To evaluate the efficacy of anti-CD15 monoclonal antibody (NeutroSpec) labeled with technetium-99m for localizing bacterial infections.
To compare NeutroSpec with existing radiolabeled agents, focusing on diagnostic accuracy and procedural advantages.
To assess the safety and specificity of NeutroSpec in clinical settings.

Main Methods:

Screening of ten monoclonal antibodies for high affinity to neutrophils.
Selection and labeling of anti-CD15 antibody (NeutroSpec) with technetium-99m.
Evaluation of NeutroSpec's binding affinity, specificity, and performance in diagnostic imaging studies.

Main Results:

Anti-CD15 antibody demonstrated high binding affinity (Kd=1.6x10(-11) M) to human neutrophils.
NeutroSpec labeling with (99m)Tc offers advantages over in vitro labeled white blood cells, including reduced procedure time.
The antibody showed high specificity for neutrophils with minimal expression on other blood cells, and a favorable safety profile in patients.

Conclusions:

NeutroSpec represents a significant advancement in nuclear imaging for infection localization.
Its high specificity, favorable safety profile, and simplified imaging protocol make it a valuable diagnostic tool.
NeutroSpec overcomes key limitations of previous radiopharmaceuticals, improving diagnostic efficiency and patient care.