“The clinical study is the first to show the advantage of combined PET-CT imaging in evaluating radioimmunotherapy for patients with non-Hodgkin lymphoma”, says Gary Ulaner, M.D., Ph.D., radiology resident and nuclear medicine fellow at the Keck School of Medicine of University of Southern California (USC) and the principal investigator of the study.
Radioimmunotherapy is a type of radiation treatment that targets cancer cells through antibodies. PET is a type of nuclear medicine imaging that uses very small amounts of radioactive material to diagnose or treat disease and other abnormalities. “When PET and CT scans are combined they can produce a more complete image of the cancer metabolism”, he says.
Researchers from the USC Positron Emission Tomography Center evaluated five men and five women—ranging in age from 38 to 70 years—who underwent PET and CT imaging both several weeks before and several months after radioimmunotherapy for non-Hodgkin lymphoma. After evaluation of CT images alone, eight of ten patients were classified as responders to treatment, and two patients were classified as having a complete response to the treatment.
After reevaluating with the fused PET-CT scans, researchers found that two patients who had residual lesions had been misclassified. Both of the patients were free of evident disease, and remained healthy after 18 or more months of follow up.
“Using this relatively novel hybrid imaging means that some patients will only require a one-day treatment of radioimmunotherapy instead of several rounds of chemotherapy,” says Peter Conti, M.D, Ph.D., professor of radiology at the Keck School of Medicine. “We will have a more accurate image that will identify the patients who have a complete response to the treatment.”
MEDICA.de; Source: University of Southern California Health Sciences