Navigation Links
Mayo Clinic-led researchers confirm gene variants associated with the most common adult leukemia
Date:4/20/2009

DENVER - A national team of researchers led by Mayo Clinic has found that patients with chronic lymphocytic leukemia (CLL) are more likely to have similar DNA changes or variants in up to six genes, compared to people who do not have the cancer.

The findings, being presented at the annual meeting of the American Association for Cancer Research, are an independent validation of an earlier European study that found a link to seven different gene variants. Six were replicated in the Mayo Clinic study.

Together, the two studies demonstrate a genetic basis for the development of CLL, the most common adult leukemia in the United States, says the study's lead investigator, statistical geneticist Susan Slager, Ph.D., an associate professor of biostatistics at Mayo Clinic.

"In our study of American patients, we replicated six out of seven gene associations that were linked to this white blood cell cancer in Europeans, and in my field this level of replication is not common," Dr. Slager says. "This is a very exciting finding, and our job now is to investigate these genes to understand how they biologically affect the development of the cancer."

"These findings could potentially lead to new treatments or even prevention of CLL, but we have a lot more work to do before we can reach that ultimate goal."

Dr. Slager estimates the risk of developing the cancer doubles if a person has any of these gene variants, but overall, that absolute risk is still very small. Four out of every 100,000 people develop CLL, so having the variant genes could increase risk to eight out of every 100,000 people, she says.

Although CLL can be generally controlled, it is considered an incurable cancer, she says. Researchers from across the country collaborated with Dr. Slager and her team to collect genetic information on 399 CLL patients and 632 participants who did not have the cancer. Within the group of CLL patients, 99 were from high-risk CLL families - defined as two or more relatives diagnosed with CLL.

Using blood samples, investigators performed a genome-wide association study. They combined patients into one group and controls into another and then compared the two groups, looking for differences in genetic variants across the chromosomes. The first analysis of this data focused on the seven single nucleotide polymorphisms (SNPs) that European researchers had found. An SNP is a variation that occurs within a single nucleotide - the structural units of DNA - within a gene, and in most studies like this, the genes in which SNP changes occur are largely known. Analyses of the other genetic variants are under way.

They found that for six of the seven variants examined, CLL patients tended to have the variant more often than patients without the disease. Dr. Slager says these variants are associated with risk of developing the disease, not with prognosis - the outcome of a patient once disease has developed. "We do know that some patients have lost regions of certain genes due to the cancer and this is associated with a poorer outcome. However, we are looking for changes in the genome that potentially determine who will get the disease in the first place," she says.

"Our general theory is that these changes, which a person inherits, combined with environmental risk factors, can predispose a person to developing CLL," she says. "The more you understand about these gene variants and how they affect risk, it becomes possible to think about ways to treat or even prevent CLL."

The researchers have identified some candidate genes that correspond to the identified SNPs, while other SNPs seem to be located near genes or in regions with no genes, i.e., what scientists call gene deserts.


'/>"/>

Contact: Karl Oestreich
newsbureau@mayo.edu
507-284-5005
Mayo Clinic
Source:Eurekalert

Related medicine news :

1. Stanford researchers find culprit in aging muscles that heal poorly
2. UCLA researchers identify markers that may predict diabetes in still-healthy people
3. Mayo Clinic researchers discover new diagnostic test for detecting infection in prosthetic joints
4. Bipolar disorder relapses halved by Melbourne researchers
5. Cell that triggers symptoms in allergy attacks can also limit damage, Stanford researchers find
6. High and mighty: first common height gene identified by researchers behind obesity gene finding
7. Researchers estimate about 9 percent of US children age 8 to 15 meet criteria for having ADHD
8. Majority of 2.4 Million U.S. Children With ADHD Not Diagnosed or Consistently Treated, According to New Gold Standard Study by Cincinnati Childrens Researchers
9. Researchers develop long-lasting growth hormone
10. Jefferson immunology researchers halt lethal rabies infection in brain
11. Purdue researchers develop technology to detect cancer by scanning surface veins
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/10/2016)... ... ... 10 Best Water is excited to announce a new monthly ... topped the list as a result of their commitment to offering clients creative, customized, ... 5100, a top notch water company that specializes in providing the public with refreshing ...
(Date:2/10/2016)... ... February 10, 2016 , ... United Benefit Advisors (UBA), ... latest addition to its growing list of Partner Firms. S.S. Nesbitt is ... Orlando to Huntsville and in between. , Harnessing the experience and insights of ...
(Date:2/10/2016)... ... February 10, 2016 , ... ... change in their patients. Research shows that the Goal Attainment Scale (GAS) captures ... overcome this challenge and learn more about the Goal Attainment Scale, Education Resources ...
(Date:2/10/2016)... (PRWEB) , ... February 10, 2016 , ... ... revolutionary, biocompatible columns and accessories. These PEEK-lined stainless steel (PLS) columns combine the ... a solution that ensures the integrity of biological samples while operating at ultra-high ...
(Date:2/10/2016)... DC (PRWEB) , ... February 10, 2016 , ... Anxiety ... level since the start of Medicare Part D a decade ago, according to ... comments from older adults on how they are coping with rapidly rising costs. ...
Breaking Medicine News(10 mins):
(Date:2/10/2016)...  Visage Imaging Inc. ("Visage"), a wholly owned ... that the American College of Radiology (ACR) and ... Visage 7 Enterprise Imaging Platform as the new ... SIMulation (SIM). SIM is the assessment component of ... multi-faceted and fully-integrated online assessment, education and remediation ...
(Date:2/10/2016)... Mast Therapeutics, Inc. (NYSE MKT: ... sickle cell disease and heart failure, today announced the ... at a price to the public of $0.275 per ... Company,s common stock and one warrant to purchase one ... price of $0.42 per share. The warrants are exercisable ...
(Date:2/10/2016)... New York , February 10, 2016 ... Growth, Trends and Forecast 2015 - 2023 ", reveals that ... rather slow growth from 2015 to 2023 owing to patent ... a meager CAGR of 1.30% during the forecast period, the ... to US$38.9 bn in 2023. --> Antibacterial Drugs ...
Breaking Medicine Technology: