Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Study identifies possible marker for efficacy of gefitinib in lung cancer patients

04.05.2005


Patients with advanced non–small-cell lung cancer (NSCLC) whose tumor cells contain extra copies of the epidermal growth factor receptor (EGFR) gene may be more likely to respond to the drug gefitinib (Iressa), and this high gene copy number may be an effective predictor of gefitinib efficacy, according to a new study in the May 4 issue of the Journal of the National Cancer Institute.



NSCLC is the leading cause of cancer death worldwide. In patients with advanced disease, chemotherapy produces only modest survival benefits. However, about 12% to 27% of advanced NSCLC patients respond to tyrosine kinase inhibitors, such as gefitinib and erlotinib (Tarceva). Methods to predict which patients are most likely to respond to these drugs are under development.

To investigate possible predictive markers for gefitinib efficacy, Fred R. Hirsch, M.D., Ph.D., of the University of Colorado Cancer Center in Aurora, and colleagues evaluated EGFR status, gene copy number, and protein expression and Akt activation status in 102 patients with advanced NSCLC.


Amplification or high copy number of the EGFR gene (33 of 102 patients) was associated with a better response rate (36% versus 3%), disease control rate (67% versus 26%), time to progression (9.0 versus 2.5 months), and survival (18.7 versus 7.0 months) compared with patients with a low number or no extra copies of the EGFR gene. A similar association was found for patients with high protein expression (58 of 98 patients) compared with patients with low protein expression. EGFR mutations (15 of 89 patients) were also associated with a better response rate and time to progression. However, further statistical analysis revealed that only high EGFR gene copy number is associated with better survival.

"In conclusion, results from this study demonstrate that gefitinib is most effective in advanced NSCLC patients with high EGFR gene copy number, protein expression, or EGFR mutations. Because only high EGFR gene copy number was associated with prolonged survival … and because [fluorescence in situ hybridization (FISH)] is a readily available clinical test, the EGFR FISH analysis represents an ideal test for selecting candidate NSCLC patients for gefitinib therapy," the authors write.

In an editorial, Frederic J. Kaye, M.D., of the National Cancer Institute and National Naval Medical Center, discusses this new research in the context of other recent studies that have examined the factors that may influence the effectiveness of tyrosine kinase inhibitors. "Unfortunately, it appears that it may be easier to accurately predict drug resistance than drug efficacy," he writes. "Until reliable prognostic tools can be prospectively validated in clinical trials, clinicians will need to balance the desire to minimize false hope while maximizing the ability to offer clinically meaningful benefit to their patients."

Sarah L. Zielinski | EurekAlert!
Further information:
http://www.oupjournals.org

More articles from Studies and Analyses:

nachricht New study: How does Europe become a leading player for software and IT services?
03.04.2017 | Fraunhofer-Institut für System- und Innovationsforschung (ISI)

nachricht Reusable carbon nanotubes could be the water filter of the future, says RIT study
30.03.2017 | Rochester Institute of Technology

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: Can the immune system be boosted against Staphylococcus aureus by delivery of messenger RNA?

Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.

Staphylococcus aureus (S. aureus) is a bacterium that colonizes by far more than half of the skin and the mucosa of adults, usually without causing infections....

Im Focus: A quantum walk of photons

Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.

The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....

Im Focus: Turmoil in sluggish electrons’ existence

An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.

We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...

Im Focus: Wafer-thin Magnetic Materials Developed for Future Quantum Technologies

Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.

Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...

Im Focus: World's thinnest hologram paves path to new 3-D world

Nano-hologram paves way for integration of 3-D holography into everyday electronics

An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Marine Conservation: IASS Contributes to UN Ocean Conference in New York on 5-9 June

24.05.2017 | Event News

AWK Aachen Machine Tool Colloquium 2017: Internet of Production for Agile Enterprises

23.05.2017 | Event News

Dortmund MST Conference presents Individualized Healthcare Solutions with micro and nanotechnology

22.05.2017 | Event News

 
Latest News

How herpesviruses win the footrace against the immune system

26.05.2017 | Life Sciences

Water forms 'spine of hydration' around DNA, group finds

26.05.2017 | Life Sciences

First Juno science results supported by University of Leicester's Jupiter 'forecast'

26.05.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>