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Related Experiment Videos

Imaging tumors in humans with Tc-99m-VIP.

M L Thakur1, C S Marcus, S Saeed

  • 1Thomas Jefferson University, 1020 Locust Street Philadelphia, PA 19107, USA. Mathew.Thakur@mail.tju.edu

Annals of the New York Academy of Sciences
|February 24, 2001
PubMed
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A novel Vasoactive Intestinal Peptide (VIP) analog, Tc-99m-TP 3654, effectively images cancers expressing VIP receptors. This non-toxic agent shows promise for improved cancer detection and diagnosis.

Area of Science:

  • Nuclear Medicine
  • Oncology
  • Radiopharmaceutical Chemistry

Background:

  • Vasoactive intestinal peptide (VIP) receptors are overexpressed in various human cancers.
  • Developing targeted radiotracers for VIP receptor-positive tumors is crucial for improved cancer imaging.

Purpose of the Study:

  • To evaluate the safety and efficacy of a novel Tc-99m-labeled VIP analog, TP 3654, for imaging cancers in humans.
  • To assess the biodistribution and diagnostic performance of Tc-99m-TP 3654 in patients with known or suspected malignancies.

Main Methods:

  • Modification of VIP at the C terminus to create TP 3654, a chelating moiety.
  • Radiolabeling of TP 3654 with Tc-99m and administration to normal volunteers and cancer patients.
  • Comparison of Tc-99m-TP 3654 imaging results with conventional imaging modalities (CT, MRI, Tc-99m-MIBI, mammography).

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Main Results:

  • Tc-99m-TP 3654 demonstrated favorable pharmacokinetics with primary renal excretion (67%) and some hepatobiliary clearance (20%).
  • The agent was well-tolerated, with no adverse reactions reported in any subjects.
  • Tc-99m-TP 3654 correctly identified known lesions and localized two malignancies not detected by Tc-99m-MIBI, including spindle cell sarcoma and ductal epithelial hyperplasia.

Conclusions:

  • Tc-99m-TP 3654 is a safe and effective radiotracer for imaging human cancers expressing VIP receptors.
  • This VIP analog offers a promising, non-toxic tool for cancer diagnosis, particularly for tumors with high VIP receptor expression.
  • The study highlights the potential of Tc-99m-TP 3654 in improving the detection and localization of specific cancer types.