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MicroRNAs May Predict Colon Cancer Prognosis
Date:1/29/2008

This genetic material shows early promise for diagnosing, treating tumors

TUESDAY, Jan. 29 (HealthDay News) -- Knowing whether or not a particular cancer will be aggressive allows doctors to more effectively treat their patients, and a newly found class of molecules called microRNAs may help doctors do just that.

Recent research has honed in on a particular microRNA, designated miR-21, that may predict outcomes in people with colon cancer. Tumor cells with high levels of miR-21 were associated with more than twice the risk of poor survival, according to a study in the Jan. 30 issue of the Journal of the American Medical Association.

"Progress is being made that is going to eventually lead to better diagnosis and predicting prognosis," said one of the study's authors, Dr. Curtis Harris, chief of the lab of human carcinogenesis at the U.S. National Cancer Institute in Bethesda, Md. "This is a new area of research that may develop exciting new therapies, but we're very early in the discovery phase. It's only been about five years since we've known about microRNA."

Colon cancer is the third most common type of cancer in the United States, and the second-leading cause of cancer death, according to background information in the study. Surgical removal of colon cancer is currently the only curative form of therapy, according to the study.

MicroRNA molecules are an attractive research target because they help control many cell functions -- from division to proliferation to apotosis (programmed cell death). They have also been implicated in the development of cancer. MicroRNA expression has been found to be altered in other malignancies, such as leukemia, lung cancer, and pancreatic cancer, the researchers said.

The researchers theorized that microRNA production was probably altered in colon cancer as well, and if they could isolate which microRNA was associated with poorer prognosis
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