PITTSBURGH, March 24 An experimental vaccine against an abnormal protein found in some tumors has the potential to delay the onset of inflammatory bowel disease (IBD) and in turn prevent progression to colon cancer, according to researchers at the University of Pittsburgh School of Medicine. Their findings are reported this week in Cancer Prevention Research, a journal of the American Association for Cancer Research.
People with chronic inflammatory disorders such as IBD are at greater risk for developing cancer at the inflamed site, said senior author Olivera Finn, Ph.D., professor and chair, Department of Immunology, Pitt School of Medicine. In other cases, genes that develop cancerous changes can trigger inflammation. The vaccine made by her team is directed against an abnormal variant of a self-made cell protein called MUC1, which is altered and produced in excess in both IBD and colon cancer.
"Our experiments indicate that boosting the immune response against this protein early in the disease can delay IBD development, control inflammation and thereby reduce the risk of future cancers," Dr. Finn said. "These findings suggest also that the early stages of chronic inflammation might be considered a premalignant condition."
The researchers tested transgenic mice that spontaneously develop IBD and then progress to colitis-associated colon cancer, producing the human version of MUC1 in both disease states. They found that animals that received the vaccine showed the first signs of IBD significantly later than those in two control groups that did not get the vaccine.
Microscopic evaluation of the colon tissue showed less inflammation in the vaccinated mice, and no indication of cancerous changes. Nearly half of the animals in each of the control groups had evidence of abnormal tissue, and two had colon cancer.
"The MUC1 vaccine seems to change the local environment from one that promotes cancer development t
|Contact: Anita Srikameswaran|
University of Pittsburgh Schools of the Health Sciences