Technique might speed development of relevant therapies.
Cellular therapeutics – using intact cells to treat and cure disease – is a hugely promising new approach in medicine, but it is hindered by the inability of doctors and scientists to effectively track the movements, destination and persistence of these cells in patients without resorting to invasive procedures, like tissue sampling.
In a paper published Sept. 17 in the online journal Magnetic Resonance in Medicine, researchers at the UC San Diego School of Medicine, University of Pittsburgh and elsewhere describe the first human tests of using a perfluorocarbon (PFC) tracer in combination with non-invasive magnetic resonance imaging (MRI) to track therapeutic immune cells injected into patients with colorectal cancer.
“Initially, we see this technique used for clinical trials that involve tests of new cell therapies,” said first author Eric T. Ahrens, Ph.D., professor in the Department of Radiology at UC San Diego. “Clinical development of cell therapies can be accelerated by providing feedback regarding cell motility, optimal delivery routes, individual therapeutic doses and engraftment success.”
Currently, there is no accepted way to image cells in the human body that covers a broad range of cell types and diseases. Earlier techniques have used metal ion-based vascular MRI contrast agents and radioisotopes. The former have proven difficult to differentiate in vivo; the latter raise concerns about radiation toxicity and do not provide the anatomical detail available with MRIs.
“This is the first human PFC cell tracking agent, which is a new way to do MRI cell tracking,” said Ahrens. “It’s the first example of a clinical MRI agent designed specifically for cell tracking.”