Barry Edwards, an associate professor of biochemistry in the School of Medicine, recently designed a very small antibody that seeks out EphA2, a protein frequently present in cancer tumors. After creating the antibody, he attached a radioactive marker that makes the molecule visible during a positron emission tomography (PET) scan.

Antibody “Flashlight” Lights Up Cancer Tumors

In experiments using mice, Edwards showed that this cancer detecting “flashlight” clearly illuminated tumors that produced EphA2. The results suggest that tagging the antibody could help doctors detect cancers that contain this protein and determine which patients might respond to therapies designed to target EphA2-positive tumor cells while leaving healthy tissue unharmed.

“By finding out which patients have high or low amounts of EphA2, we can determine who is most likely to benefit from a targeted cancer treatment,” Edwards, who also has an appointment in the College of Arts and Science, said. “There is no sense in giving a treatment that won’t work to a patient, so this new process we created saves time and money while advancing precision medicine.”

Faster and Less Invasive Than Traditional Methods

Doctors currently depend on biopsies and MRI scans to evaluate tumors in cancer patients. These methods can be invasive, require significant time, and often provide limited insight into the specific proteins found within cancer cells. Edwards, who uses advanced imaging technology at Mizzou’s Molecular Imaging and Theranostics Center for his research, hopes to advance this technique from preclinical studies to human clinical trials within the next seven years.

“This new targeted approach is noninvasive, and you can get results from the imaging in hours rather than days, which can be huge for patients traveling long distances to seek treatment,” Edwards said. “By making the process easier and faster for both patients and clinicians, we’re showing that precision medicine is a win-win.”

The study, titled “Preclinical evaluation of anti-EphA2 minibody-based immunoPET agent as a diagnostic tool for cancer,” was published in Molecular Imaging and Biology.