Featured Research

from universities, journals, and other organizations

Expression Patterns Of MicroRNAs Appear Altered In Colon Cancer, And Associated With Poor Outcomes

Date:
February 2, 2008
Source:
JAMA and Archives Journals
Summary:
Preliminary research has found an association between certain microRNA expression patterns and poor survival and treatment outcomes for colon cancer. Colon cancer is a major cause of cancer death worldwide. Colorectal cancer is the third most common and second leading cause of cancer death in the United States.

Preliminary research has found an association between certain microRNA expression patterns and poor survival and treatment outcomes for colon cancer.

Colon cancer is a major cause of cancer death worldwide. Colorectal cancer is the third most common and second leading cause of cancer death in the United States. "Even though 5-year mortality rates have modestly declined over the last 3 decades, there is still a need to identify new prognostic biomarkers and therapeutic targets for this disease," the authors write. They add that microRNAs have potential as diagnostic biomarkers and therapeutic targets in cancer.

MicroRNAs are 18 to 25 nucleotide, noncoding RNA (ribonucleic acid) molecules that have been found to regulate a variety of cellular processes and may also have a role in the development of cancer cells. The prognostic potential of microRNAs has been demonstrated for chronic lymphocytic leukemia, lung cancer and pancreatic cancer, according to background information in the article. No study has evaluated the association between microRNA expression patterns and colon cancer prognosis or therapeutic outcomes.

Aaron J. Schetter, Ph.D., M.P.H., and Curtis C. Harris, M.D., of the National Cancer Institute, National Institutes of Health, Bethesda, Md., and colleagues evaluated microRNA profiles of colon tumors and paired nontumorous tissue to study their potential role in tumor formation, diagnosis and therapeutic outcome in colon cancer. The study included 84 patients from Maryland; associations were validated in a second, independent group of 113 patients from Hong Kong.

Thirty-seven microRNAs were differentially expressed in tumor tissues by microRNA microarray analysis in the Maryland test cohort. Expression patterns of five tested microRNAs were validated in the Hong Kong cohort. "The discriminatory power of 5 microRNAs to differentiate between tumor and nontumorous tissue suggests that predictable and systematic changes of microRNA expression patterns may occur during tumorigenesis and may be representative of sporadic colon adenocarcinomas," the authors write.

"... we found systematic differences in microRNA expression patterns between colon tumors and paired nontumorous tissue. Tumors with high expression of miR-21 [a microRNA] was associated with poor survival outcome and poor response to adjuvant chemotherapy in 2 independent cohorts, independent of staging and other clinical covariates suggesting that miR-21 may be a useful diagnostic biomarker for colon adenocarcinomas and survival prognosis including response to therapy."

"Additional studies are required to demonstrate a causal link with miR-21 and the progression of colon cancer to determine the potential of miR-21 as either a biomarker or therapeutic target," the researchers write.

Journal reference: JAMA. 2008;299[4]:425-436.


Story Source:

The above story is based on materials provided by JAMA and Archives Journals. Note: Materials may be edited for content and length.


Cite This Page:

JAMA and Archives Journals. "Expression Patterns Of MicroRNAs Appear Altered In Colon Cancer, And Associated With Poor Outcomes." ScienceDaily. ScienceDaily, 2 February 2008. <www.sciencedaily.com/releases/2008/01/080129160742.htm>.
JAMA and Archives Journals. (2008, February 2). Expression Patterns Of MicroRNAs Appear Altered In Colon Cancer, And Associated With Poor Outcomes. ScienceDaily. Retrieved September 23, 2014 from www.sciencedaily.com/releases/2008/01/080129160742.htm
JAMA and Archives Journals. "Expression Patterns Of MicroRNAs Appear Altered In Colon Cancer, And Associated With Poor Outcomes." ScienceDaily. www.sciencedaily.com/releases/2008/01/080129160742.htm (accessed September 23, 2014).

Share This



More Health & Medicine News

Tuesday, September 23, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Liberia Pleads for Help to Fight Ebola

Liberia Pleads for Help to Fight Ebola

AP (Sep. 22, 2014) Liberia's finance minister is urging the international community to quickly follow through on pledges of cash to battle Ebola. Bodies are piling up in the capital Monrovia as the nation awaits more help. (Sept. 22) Video provided by AP
Powered by NewsLook.com
Ebola Doctor Says Border Controls Critical

Ebola Doctor Says Border Controls Critical

AP (Sep. 22, 2014) A Florida doctor who helped fight the expanding Ebola outbreak in West Africa says the disease can be stopped, but only if nations quickly step up their response and make border control a priority. (Sept. 22) Video provided by AP
Powered by NewsLook.com
Global Ebola Aid Increasing But Critics Say It's Late

Global Ebola Aid Increasing But Critics Say It's Late

Newsy (Sep. 21, 2014) More than 100 tons of medical supplies were sent to West Africa on Saturday, but aid workers say the global response is still sluggish. Video provided by Newsy
Powered by NewsLook.com
Sierra Leone in Lockdown to Control Ebola

Sierra Leone in Lockdown to Control Ebola

AP (Sep. 21, 2014) Sierra Leone residents remained in lockdown on Saturday as part of a massive effort to confine millions of people to their homes in a bid to stem the biggest Ebola outbreak in history. (Sept. 20) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Health & Medicine

Mind & Brain

Living & Well

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins