Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Gene expression profile helps predict chemotherapy response in ovarian cancer patients

07.11.2005


A newly identified gene expression profile could help predict how patients with advanced ovarian cancer will respond to chemotherapy treatment. Described in a study in the November 1, 2005 issue of The Journal of Clinical Oncology (JCO), the new findings further establish an important role for microarray gene profiling as a predictor of clinical outcome in ovarian cancer, and could eventually provide clinicians with insights into the mechanisms of drug resistance.



"In many patients with advanced ovarian cancer, post-operative treatment with first-line chemotherapy will result in an excellent clinical response," says senior author Stephen A. Cannistra, MD, director of gynecologic oncology at Beth Israel Deaconess Medical Center (BIDMC) and professor of medicine at Harvard Medical School.

"However," he adds, "due to the lingering presence of chemotherapy-resistant cancer cells, most patients will unfortunately experience a relapse. The goal of our current research is to help determine which patients will relapse and which will not, and to better understand the reasons for this."


Cannistra’s group has been working to develop a genetic profile of ovarian cancer that will enable clinicians to more accurately determine a patient’s prognosis. As a first step in this process, he and his colleagues last year identified a gene expression profile known as the Ovarian Cancer Prognostic Profile (OCPP), which is predictive of survival in patients with advanced ovarian cancer. (These study results appear in the December 2004 issue of the JCO.)

Their work makes use of a DNA technology known as microarray analysis, in which genes expressed by cancer cells are labeled and applied to a glass slide containing embedded sequences of thousands of known human genes. The genes that are present in the tumor cell bind to their counterpart sequences on the slide and can then be identified through computer analysis.

In this new study, the authors conducted microarray testing on samples from 60 ovarian cancer patients treated at BIDMC and Memorial Sloan-Kettering Cancer Center to determine if tumor tissue obtained at a patient’s initial diagnosis expressed a gene profile predictive of findings at second-look surgery. (Second-look surgery is currently the most sensitive investigational approach for detecting residual disease in patients with advanced ovarian cancer who have achieved a complete clinical remission following chemotherapy, explains Cannistra.)

The expression of 93 genes, collectively referred to as the Chemotherapy Response Profile (CRP), was found to predict which patients would experience a complete response to chemotherapy, as defined by the absence of disease at the time of second-look surgery. The CRP also confirmed the importance of genes such as BAX in this process, which regulate the cell’s response to chemotherapy agents such as paclitaxel.

The authors then went on to compare the results of the CRP and the OCPP. "We found that together these two gene profiles [CRP and OCPP] are a more powerful predictor of a patient’s prognosis than either profile separately," says Cannistra. "This represents the first time that two profiles have been combined to yield such a powerful result in this disease."

One of the most difficult types of cancer to treat, advanced ovarian cancer accounts for approximately 26,000 new cases and 16,000 deaths in the U.S. each year.

"Being able to identify the expression pattern of these genes from the original tumor sample [i.e. whether genes were ’turned on’ or ’turned off’] provides us with valuable information about a patient’s prognosis as this type of information cannot always be obtained from standard clinical features, such as tumor grade or residual disease status," notes Cannistra. "And with the identification of each new gene expression profile, we come one step closer to eventually being able to develop treatments tailored to individual ovarian cancer patients."

Coauthors of the study include BIDMC investigators Dimitrios Spentzos, MD, Douglas Levine, MD, Towia A. Libermann, PhD, Shakirahimed Kolia and Hasan Out and Jeff Boyd, PhD, of Memorial Sloan-Kettering Cancer Center in New York.

Bonnie Prescott | EurekAlert!
Further information:
http://www.bidmc.harvard.edu

More articles from Life Sciences:

nachricht Single-stranded DNA and RNA origami go live
15.12.2017 | Wyss Institute for Biologically Inspired Engineering at Harvard

nachricht New antbird species discovered in Peru by LSU ornithologists
15.12.2017 | Louisiana State University

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: First-of-its-kind chemical oscillator offers new level of molecular control

DNA molecules that follow specific instructions could offer more precise molecular control of synthetic chemical systems, a discovery that opens the door for engineers to create molecular machines with new and complex behaviors.

Researchers have created chemical amplifiers and a chemical oscillator using a systematic method that has the potential to embed sophisticated circuit...

Im Focus: Long-lived storage of a photonic qubit for worldwide teleportation

MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.

Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...

Im Focus: Electromagnetic water cloak eliminates drag and wake

Detailed calculations show water cloaks are feasible with today's technology

Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...

Im Focus: Scientists channel graphene to understand filtration and ion transport into cells

Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.

To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...

Im Focus: Towards data storage at the single molecule level

The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.

Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

AKL’18: The opportunities and challenges of digitalization in the laser industry

07.12.2017 | Event News

 
Latest News

Engineers program tiny robots to move, think like insects

15.12.2017 | Power and Electrical Engineering

One in 5 materials chemistry papers may be wrong, study suggests

15.12.2017 | Materials Sciences

New antbird species discovered in Peru by LSU ornithologists

15.12.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>