Reston, Va.An imaging technique combining ultrasound and specially modified contrast agents may allow researchers to noninvasively detect cancer and show its progression, according to research published in the March issue of The Journal of Nuclear Medicine (JNM). The technique enables researchers to visualize tumor activity at the molecular level.
"We hope this technique might be helpful for the early detection of disease," said Juergen K. Willmann, M.D., lead author of the study and assistant professor of radiology at Stanford University School of Medicine. "It may help save lives by finding cancersuch as breast, ovarian or pancreatic cancerin the very early stages, when it is still curable."
In the study, researchers intravenously injected microbubblesgas-filled spheres small enough to travel through vesselsinto mice with cancers. The microbubbles, which were paired with a new peptide (a molecule that consists of a chain of amino acids), were designed to travel through the vascular system and attach to integrina well-characterized molecular marker that acts as a "red flag" for tumor vessel growth, or angiogenesis. Tumor vessel growth occurs when active tumor cells create certain pathways to provide the tumor with a sufficient supply of oxygen, nutrients and other factors needed for growth.
Once the gas-filled microbubbles seek out the cancers and attach to their vessel walls, they send out strong signals that are picked up by standard clinical ultrasound scanners. The imaging signals produced by the microbubbles are reflected back to the ultrasound transducer and illuminate the areas that outline the tumor, thus providing researchers with a sonogram of tumor vessel growth on a molecular level.
"Ultrasound holds great promise for the application of molecular imaging because it is widely available, relatively inexpensive and safe. There is no exposure to radiation and repetitive imaging is not a concern," said D
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Society of Nuclear Medicine