Navigation Links
Stool DNA testing could play expanded role in colon cancer prevention
Date:5/4/2010

NEW ORLEANS -- Research teams led by Mayo Clinic have demonstrated for the first time that two types of colorectal pre-cancers can be detected through noninvasive stool DNA testing. The two studies being presented demonstrate that stool DNA testing may be useful for detection of premalignant dysplasia in patients with inflammatory bowel disease (IBD) and of an important type of colorectal pre-cancer called serrated polyps. The findings were presented at Digestive Disease Week 2010 (http://www.ddw.org/exhibitors), the annual meeting of the American Gastroenterological Association.

VIDEO ALERT: Additional audio and video resources, including excerpts from an interview with Dr. David Ahlquist describing the research, are available on the Mayo Clinic News Blog (http://newsblog.mayoclinic.org/?p=3208&preview=true ). These materials also are subject to embargo, but may be accessed in advance by journalists for incorporation into stories. The password for this post is Ahlquist4.

David Ahlquist, M.D. (http://www.mayoclinic.org/bio/10006044.html), a gastroenterologist with Mayo Clinic and the senior investigator, said that sensitive stool DNA test methods developed at Mayo Clinic can detect common forerunners of colorectal cancer. "Detection of precursor lesions during screening is essential if cancer prevention is the goal," Dr. Ahlquist says.

Compared to widely used fecal blood tests, stool DNA testing has higher detection rates for curable stage colorectal cancer and for common precancerous polyps (called adenomas).

Detection of Colorectal Precancerous Lesions in Inflammatory Bowel Disease (Embargoed until DDW presentation, May 3, 2010, 5:30 p.m. CT)

The first study, presented on May 3 at Digestive Disease Week, involves identifying both cancer and a precancerous lesion, called dysplasia, in people who suffer from IBD. In a blinded study with 10 cases and 10 controls done in conjunction with Mount Sinai Medical Center and the University of Chicago, researchers found that stool DNA testing was positive in nine out of 10 cases (five of five with cancer, and four of five with dysplasia).

"This study shows that cancer and pre-cancer in IBD can be detected noninvasively," says Dr. Ahlquist. "The 90 percent detection rate by stool DNA testing is remarkable. It's important for people with IBD because they are at much higher risk for colorectal cancer than the general population. Given the limitations of colonoscopies in detecting these lesions, stool DNA testing could play a complementary role to improve the effectiveness of cancer surveillance."

Detection of Serrated Colorectal Polyps (Embargoed until DDW presentation, May 4, 3 p.m. CT)

The second study, presented on May 4, involves detecting serrated colorectal polyps. Unlike common adenomas, which usually protrude from the colon lining and are easy to see, serrated polyps are typically flat and the same color as the colon lining. Dr. Ahlquist says serrated polyps have been ignored or excluded from most screening studies to date because it wasn't clear they were associated with cancer. "Now they are regarded as the forerunner in roughly 30 percent of colon cancers," says Dr. Ahlquist. "Most of these are located on the right side of the colon, where screening has had less impact historically."

For this study, researchers first took tissue and identified two genetic markers that were present in serrated polyps but not in normal colon. The team assayed the markers (mutant BRAF and methylated vimentin genes) in stool samples from 14 cases and 19 control patients who had undergone screening colonoscopies. In blinded fashion, they compared results to fecal blood tests on the same specimens.

"We observed a 71 percent detection rate with stool DNA testing," says Dr. Ahlquist. "This was significantly higher than the 7 percent rate with conventional fecal blood tests."

"Detection of these important types of precancer by stool DNA testing offers promise in our efforts to more effectively and affordably prevent colorectal cancer ," says Dr. Ahlquist. "However, findings from both pilot studies need to be corroborated in larger studies."


'/>"/>

Contact: Amy Tieder
newsbureau@mayo.edu
507-284-5005
Mayo Clinic
Source:Eurekalert

Related medicine news :

1. Edifecs Testifies Before NCVHS Standards Subcommittee Regarding HIPAA 5010 and ICD-10 Testing
2. Doctors and Scientists Create New Society to Promote Non-Animal Toxicology Testing Methods
3. The Institute of Women's Health of North America to Offer Free Chlamydia Testing at All Affiliated Campuses – Dr. Abdul Rao
4. AXIOM Systems, Inc. Announces General Release of HIPAA 5010 Testing Solutions
5. ANY LAB TEST NOW North Dallas Lowers Diabetes Testing to $89
6. Refinement of glaucoma testing, treatment expected from US, United Kingdom study
7. Midbrook Lab Testing Provides Results for Cleaning Process Develop and Verification
8. Statement from American Water Works Association on the Environmental Working Group's report on Tap Water Quality Testing and Violations
9. Reportlinker Adds Peptic Ulcer Testing - A World Market Intelligence Report
10. Targeted Testing Receives Favorable Reviews On PADDS, Begins Nationwide Research Study On The Target Tests of Executive Functioning-OV
11. IQS Testing Purchased by The Compliance Management Group
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:10/13/2017)... ... October 13, 2017 , ... PurhealthRX , a ... utilizing Purzorb™ technology. Applying the Purzorb™process to full spectrum CBD oil will revolutionize the ... a CBD form that can be easily incorporated into liquid products, while reducing costs ...
(Date:10/13/2017)... ... ... Lori R. Somekh, founder of the Law Office of Somekh & ... and special needs planning attorneys. “Membership in ElderCounsel helps our office remain up to ... with elder law attorneys nationwide,” said Somekh. , ElderCounsel was founded ...
(Date:10/13/2017)... ... 13, 2017 , ... Many families have long-term insurance that covers care for ... a waiver for care if the client has a cognitive impairment diagnosis. , ... care, is often waived, so the benefits from their insurance start immediately,” said Mechell ...
(Date:10/13/2017)... ... October 13, 2017 , ... Ellevate Network, the leading network for professional ... action towards gender equality at their inaugural Summit in New York City in June. ... a social audience of over 3 million. To watch the Mobilize Women video, ...
(Date:10/13/2017)... Texas (PRWEB) , ... October 13, 2017 , ... Yisrayl ... this week that explains one of the most popular and least understood books in ... like cryptic and puzzling descriptions that have baffled scholars for centuries. Many have tossed ...
Breaking Medicine News(10 mins):
(Date:10/2/2017)... Fla. , Oct. 2, 2017  AllianceRx Walgreens ... company formed by Walgreens and pharmacy benefit manager Prime ... its new brand, which included the unveiling of new ... , as well as at a few other ... the new brand to patients, some of whom will ...
(Date:9/28/2017)... , Sept. 28, 2017 Hill-Rom Holdings, Inc. ... earnings conference call and webcast on Friday, November 3, ... (EDT) and ending at approximately 8:30 a.m. (CDT) / ... the company,s 2017 financial performance and guidance for 2018, ... initiatives to enhance operational performance, and long-range financial outlook ...
(Date:9/27/2017)... Sept. 27, 2017  DarioHealth Corp. (NASDAQ: DRIO), a leading global digital ... its MyDario product is expected to appear on The Dr. Oz Show ... Oz Show airs in your area: http://www.doctoroz.com/page/where-watch-dr-oz-show ... The nine-time Emmy award-winning, The Dr. Oz Show kicked off ... The segment features ...
Breaking Medicine Technology: