Navigation Links
New Genetic Clues to Breast Cancer?
Date:1/23/2012

By Kathleen Doheny
HealthDay Reporter

SUNDAY, Jan. 22 (HealthDay News) -- Researchers have identified three new genomic regions they believe are linked with breast cancer that may help explain why some women develop the disease.

All three newly identified areas "contain interesting genes that open up new avenues for biological and clinical research," said researcher Douglas Easton, a professor of genetic epidemiology at the University of Cambridge in England.

Breast cancer is the most common cancer among women, with about 1 million new cases annually worldwide and more than 400,000 deaths a year.

Scientists conducting genome-wide association studies -- research that looks at the association between genetic factors and disease to pinpoint possible causes -- had already identified 22 breast cancer susceptibility loci. Locus is the physical location of a gene or DNA sequence on a chromosome.

"The three [newly identified] loci take the number of common susceptibility loci from 22 to 25," said Easton.

However, the three new susceptibility loci might explain only about 0.7 percent of the familial risks of breast cancer, bringing the total contribution to about 9 percent, the researchers said.

Michael Melner, scientific program director for the American Cancer Society, said this current research adds some important new clues to existing evidence, but he agreed that the number of cases likely associated with these three variants is probably low.

"So the total impact in terms of patients would be fairly small," Melner said.

The study is published online Jan. 22 in Nature Genetics.

To find the new clues, Easton's team worked with genetic information on about 57,000 breast cancer patients and 58,000 healthy women obtained from two genome-wide association studies.

The investigators zeroed in on 72 different single nucleotide polymorphisms (SNPs). A SNP -- pronounced "snip" -- is a change in which a single base in the DNA differs from the usual base. The human genome has millions of SNPs, some linked with disease, while others are normal variations.

The researchers focused on three SNPs -- on chromosomes 12p11, 12q24 and 21q21.

Easton's team found that the variant on the 12p11 chromosome is linked with both estrogen receptor-positive breast cancer (which needs estrogen to grow) and estrogen receptor-negative breast cancer. The other two variants are only linked with ER-positive cancers, they said.

One of the newly identified variants is in an area with a gene that has a role in the development of mammary glands and bones. Easton said it was already known that mammary gland development in puberty is an important period in terms of determining later cancer risk. "But these are the first susceptibility genes to be shown to be involved in this process," he said.

One of the other SNPs is in an area that can affect estrogen receptor signaling, the researchers found.

Melner, noting some of the research is "fine tuning" of other work, said in his view the new understanding of the signaling pathways and their genetic links is the most important finding.

"When you delineate a pathway, you bring up new potential targets for therapy," he said. "The more targets you have, you open up the potential for having multiple drugs and attacking a cancer more easily, without it becoming more resistant."

Overall, Melner added, the results underscore the complexity of the different mechanisms involved in breast cancer development.

More information

For more about the genetics of breast cancer, visit the American Cancer Society.

SOURCES: Douglas Easton, Ph.D., professor, genetic epidemiology, University of Cambridge, England; Michael H. Melner, Ph.D., scientific program director, American Cancer Society; Jan. 22, 2012, Nature Genetics, online


'/>"/>
Copyright©2010 ScoutNews,LLC.
All rights reserved  

Related medicine news :

1. Certain genetic profiles associated with recurrence-free survival for non-small cell lung cancer
2. Obstructive Sleep Apnea in Kids May Have Genetic Cause
3. Epigenetic signals differ across alleles
4. Study reveals genetic link between mammographic density and breast cancer
5. Genetic Risk Score Doesnt Spot Heart Trouble in Women
6. Penn researchers find genetic link to leukemias with an unknown origin
7. Scientists Spot Genetic Fingerprints of Individual Cancers
8. Genetic health risks in children of assisted reproductive technology
9. Genetic Mutation Linked to Prostate Cancer in Blacks
10. Protecting the brain from of a deadly genetic disease
11. Protecting the brain from a deadly genetic disease
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
New Genetic Clues to Breast Cancer?
(Date:9/22/2017)... ... September 22, 2017 , ... Silicon Valley ... even on the go. Their electric toothbrushes aggressively attack oral bacteria by reducing ... sanitizing technology. Combining leading edge Enke technology with a premium timeless design, they ...
(Date:9/22/2017)... ... September 22, 2017 , ... “Letters From Home”: a moving ... lost, have value to God. “Letters From Home” is the creation of published author, ... the President’s Cabinet of Jerry Savelle Ministries International, who has traveled and ministered on ...
(Date:9/22/2017)... ... September 22, 2017 , ... ... and create life. Although frozen embryos have a slight statistical advantage for live ... freezing is a wonderful opportunity for women undergoing medical treatment or who are ...
(Date:9/21/2017)... ... 21, 2017 , ... With ProSlideshow Portrait from Pixel Film Studios creating a ... select from up to two layers of subject matter along with fully customizable backdrop ... Final Cut Pro X. , With ProSlideshow Portrait each user are given ...
(Date:9/21/2017)... ... 21, 2017 , ... Process Capability Indices for Medical Device ... ET, http://www.fdanews.com/processcapabilityindices      , Quality in device manufacturing is ... Quality System Regulation (§820.250), and Devicemakers find themselves staring at a warning letter. ...
Breaking Medicine News(10 mins):
(Date:9/9/2017)... ... ... – Monday, September 18 th .The Brain Tumor Foundation (BTF) begins ... the public.Where:  BTF,s Mobile MRI Unit – a ... Washington, D.C.What:BTF brings its nationwide initiative, the Road to Early Detection Sponsor-A-City ...
(Date:9/9/2017)... Lilly and Company (NYSE: LLY ) will ... an investigational, oral, first-in-class molecule for the acute treatment ... placebo in the Phase 3 SPARTAN study. Detailed results ... the International Headache Society (IHC) in Vancouver ... lasmiditan,s potential to reduce pain and provide freedom from ...
(Date:9/7/2017)... MIRAGE, Calif. , Sept. 7, 2017  For nearly two decades, ... service in the Assisted Reproduction Insurance industry. Today, New Life Agency announces ... fertility medications. ... http://pharmacarecard.com/ (PRNewsfoto/PharmaCareCard) ... ...
Breaking Medicine Technology: