RNA Biomarker may help predict stomach cancer survival

By: Mohan Garikiparithi | Health News | Tuesday, September 08, 2015 - 12:21 PM

Stomach cancer The RNA Biomarker microRNA 506 (miR-506) takes the phrase, “Starve a fever” to a higher level and links starving to stomach cancer survival. Scientists at the Cancer Research Institute of Southern Medical University and the Cancer Biotherapy Center of Kunming Medical University propose to starve cancer cells to prevent the spread of cancer.

In a recent study, the scientists identified that stomach cancer survival is better in patients who have high levels of the RNA biomarker (miRNA-506). The biological marker helps cut off the blood supply to the cancer cells (effectively starving them) which in turn closes the avenues for the spread of the cancer to other parts of the body.

The details of the study can be seen in The American Journal of Pathology.

For the study, the researchers used data from 84 people who had undergone surgery for stomach cancer. The researchers subjected the gastric samples taken from these patients to genetic analysis called the polymerone chain reaction (PCR). The aim of the study was to detect the level of miRNA-506 in the stomach samples. Based on whether the levels were above or below the mean miRNA-506 level, the patients were put in either the low-miRNA-506 expression group, or the high-expression group.

The researchers noted that cumulative survival was approximately 30 percent in the low-miRNA-506 expression group, whereas in the high-expression group the cumulative survival was 80 percent.

The researchers also found that miRNA-506 suppresses tumor growth and blood vessel formation.

This finding led to the next part of the study: in-vitro research.

Researchers found that when the cells were grown in-vitro, the cell lines that had the highest invasive activity had the lowest miRNA-506 levels. And the cell lines that had the lowest invasive activity had the highest miRNA-506 levels. And yes, all stomach cancer cells had lower levels of miRNA-506 than normal stomach cells.

From these results it was obvious to the scientists that miRNA-506 acts as a suppressor of how cancer cells spread.

According to lead investigator Dr. Xin Song, as cancer is a complex disease, controlling its development and progression requires both system level approaches and integrative approaches. He adds that their findings indicate that miRNA-506 is necessary and sufficient for suppressing the development of new blood vessels in the cancerous tissue and increases stomach-cancer survival time.

The team acknowledges that additional research will be needed to study the clinical utility of miRNA-506 as a potential biological marker both for gastric cancer prognosis and as a target for potential treatment.

Stomach cancer is a primary cause of cancer-related deaths across the globe. In the U.S., gastric cancer most commonly affects older people – around 60 percent of those diagnosed each year are over 65 years of age. The overall 5-year relative survival rate of all people with stomach cancer in the U.S. is about 29 percent. But with this new study, researchers hope that number will soon increase.


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