Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Lung tumors in never-smokers show greater genomic instability than those in smokers

05.07.2011
Lung adenocarcinomas in people who have never smoked show greater genome instability than those in smokers, supporting the theory that lung cancer in never smokers arises through different pathways, according to research presented at the 14th World Conference on Lung Cancer in Amsterdam, hosted by the International Association for the Study of Lung Cancer (IASLC).

"We identified several genomic regions that were differentially altered in the lung tumor genomes of smokers and never smokers," said principal investigator Kelsie Thu, a researcher at the BC Cancer Agency Research Centre in Vancouver, Canada.

"We also found that a greater fraction of lung tumor DNA harbored genetic alterations in never smokers compared to smokers. The discovery that there are different patterns of genetic alterations in smokers and never smokers suggests that lung cancers in these cohorts are likely distinct diseases driven by different molecular mechanisms, and thus, may require different treatments."

Up to 25% of lung cancer cases worldwide occur in people who have never smoked, and never smokers with lung cancer typically exhibit traits different from those of smokers. They are more often women, Asian, have a higher incidence of epidermal growth factor receptor (EGFR) mutations, better responses to EGFR-targeting drugs and are more commonly diagnosed with adenocarcinoma.

"There are a few known differences between lung cancers in smokers and never smokers. However, the differences discovered thus far are clinical features or genetic alterations at only a few specific genes," Thu said. "For our study, we wanted to use an unbiased, whole-genome approach that would allow us to investigate all of the genes in the genome simultaneously. This enables us to identify genome-wide patterns of genetic alterations in lung tumors from smokers and never smokers. Our study was a comparative study, meaning that we compared the lung tumor genomes from smokers to those from never smokers to identify genetic (DNA level) alterations specific to one group or the other. The genetic alterations specific to the never smoker group may have important roles in driving the development of lung cancer in never smokers."

In the study, researchers extracted DNA from lung adenocarcinomas and matched non-malignant tissues for 30 never smokers, 14 former smokers and 39 current smokers. The DNA was assessed for EGFR and KRAS mutations. Copy number profiles were generated for each tumor using matched non-malignant lung tissue as a baseline for the identification of somatic copy number alterations. Two independent, publicly available datasets composed of lung adenocarcinomas from never smokers and smokers were used as validation datasets.

On average, never smokers' lung tumors showed higher frequencies of copy number alterations and greater proportions of altered genomes compared with those of smokers. This difference was more pronounced when former smokers were excluded and never smokers were compared with current smokers only.

Kelsie Thu will discuss the research with journalists during a WCLC press conference at 10 a.m. CET on Tuesday, July 5. For individual interview requests, please call Renée McGaw at +31 20 549 3413 between July 3-7 in the press office at Amsterdam RAI, Amsterdam, the Netherlands. You may also email her at renee.mcgaw@ucdenver.edu

About the IASLC:

The International Association for the Study of Lung Cancer (IASLC), based in Denver, Colorado, U.S.A., is the only global organization dedicated to the study of lung cancer. Founded in 1972, the association's membership includes more than 3,000 lung cancer specialists in 80 countries.

IASLC members promote the study of etiology, epidemiology, prevention, diagnosis, treatment and all other aspects of lung cancer and thoracic malignancies. IASLC disseminates information about lung cancer to scientists, members of the medical community and the public, and uses all available means to eliminate lung cancer as a health threat for the individual patients and throughout the world. Membership is open to any physician, health professional or scientist interested in lung cancer.

IASLC publishes the Journal of Thoracic Oncology, a valuable resource for medical specialists and scientists who focus on the detection, prevention, diagnosis and treatment of lung cancer. To learn more about IASLC please visit http://iaslc.org/

About the BC Cancer Agency:

The BC Cancer Agency, an agency of the Provincial Health Services Authority, is committed to reducing the incidence of cancer, reducing the mortality from cancer, and improving the quality of life of those living with cancer. It provides a comprehensive cancer control program for the people of British Columbia by working with community partners to deliver a range of oncology services, including prevention, early detection, diagnosis and treatment, research, education, supportive care, rehabilitation and palliative care. For more information, visit www.bccancer.ca.

Renée McGaw | EurekAlert!
Further information:
http://www.bccancer.ca
http://iaslc.org/

Further reports about: Cancer DNA EGFR current smokers lung cancer molecular mechanism specific gene tumor genome

More articles from Studies and Analyses:

nachricht Antarctic Ice Sheet mass loss has increased
14.06.2018 | Technische Universität Dresden

nachricht WAKE-UP provides new treatment option for stroke patients | International study led by UKE
17.05.2018 | Universitätsklinikum Hamburg-Eppendorf

All articles from Studies and Analyses >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Temperature-controlled fiber-optic light source with liquid core

In a recent publication in the renowned journal Optica, scientists of Leibniz-Institute of Photonic Technology (Leibniz IPHT) in Jena showed that they can accurately control the optical properties of liquid-core fiber lasers and therefore their spectral band width by temperature and pressure tuning.

Already last year, the researchers provided experimental proof of a new dynamic of hybrid solitons– temporally and spectrally stationary light waves resulting...

Im Focus: Overdosing on Calcium

Nano crystals impact stem cell fate during bone formation

Scientists from the University of Freiburg and the University of Basel identified a master regulator for bone regeneration. Prasad Shastri, Professor of...

Im Focus: AchemAsia 2019 will take place in Shanghai

Moving into its fourth decade, AchemAsia is setting out for new horizons: The International Expo and Innovation Forum for Sustainable Chemical Production will take place from 21-23 May 2019 in Shanghai, China. With an updated event profile, the eleventh edition focusses on topics that are especially relevant for the Chinese process industry, putting a strong emphasis on sustainability and innovation.

Founded in 1989 as a spin-off of ACHEMA to cater to the needs of China’s then developing industry, AchemAsia has since grown into a platform where the latest...

Im Focus: First real-time test of Li-Fi utilization for the industrial Internet of Things

The BMBF-funded OWICELLS project was successfully completed with a final presentation at the BMW plant in Munich. The presentation demonstrated a Li-Fi communication with a mobile robot, while the robot carried out usual production processes (welding, moving and testing parts) in a 5x5m² production cell. The robust, optical wireless transmission is based on spatial diversity; in other words, data is sent and received simultaneously by several LEDs and several photodiodes. The system can transmit data at more than 100 Mbit/s and five milliseconds latency.

Modern production technologies in the automobile industry must become more flexible in order to fulfil individual customer requirements.

Im Focus: Sharp images with flexible fibers

An international team of scientists has discovered a new way to transfer image information through multimodal fibers with almost no distortion - even if the fiber is bent. The results of the study, to which scientist from the Leibniz-Institute of Photonic Technology Jena (Leibniz IPHT) contributed, were published on 6thJune in the highly-cited journal Physical Review Letters.

Endoscopes allow doctors to see into a patient’s body like through a keyhole. Typically, the images are transmitted via a bundle of several hundreds of optical...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Munich conference on asteroid detection, tracking and defense

13.06.2018 | Event News

2nd International Baltic Earth Conference in Denmark: “The Baltic Sea region in Transition”

08.06.2018 | Event News

ISEKI_Food 2018: Conference with Holistic View of Food Production

05.06.2018 | Event News

 
Latest News

Graphene assembled film shows higher thermal conductivity than graphite film

22.06.2018 | Materials Sciences

Fast rising bedrock below West Antarctica reveals an extremely fluid Earth mantle

22.06.2018 | Earth Sciences

Zebrafish's near 360 degree UV-vision knocks stripes off Google Street View

22.06.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>