Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Presence of gene mutation helps guide thyroid cancer treatment

07.09.2007
A specific gene mutation may be useful in predicting the level of aggression of thyroid cancer and help guide treatment options and follow-up care, according to new study findings.

The mutation, called BRAF V600E, is a genetic alteration in the BRAF oncogene, a modified gene believed to cause cancer. The new research is reported in the September issue of the “Annals of Surgery.”

Past studies have shown that the mutation frequently occurs in the most common type of thyroid cancer, conventional papillary thyroid cancer or PTC, but this is the largest study to classify thyroid cancer by cell structure subtype and to show that the mutation is significantly associated with cancer recurrence after treatment, according to the research team.

The findings come at an important time as both the incidence of thyroid cancer and the number of patients who die from the disease is increasing in the United States. More than 33,000 new cases of thyroid cancer are expected to be diagnosed in 2007, according to the National Cancer Institute.

... more about:
»BRAF »PTC »Thyroid »conventional »follicular

Most patients diagnosed with thyroid cancer have small, localized PTC but may receive aggressive treatment because their risk of recurrence and death cannot be reliably predicted prior to surgery, the study authors noted.

“There is a pressing need to identify a reliable preoperative approach for stratifying patients according to risk of thyroid cancer recurrence and death,” said lead author Electron Kebebew, MD, who is an assistant professor of surgery and endocrine surgeon at the University of California, San Francisco and a research scientist with the UCSF Comprehensive Cancer Center.

“This study shows that a particular mutation is a reliable indicator, and testing for the mutation may be useful for selecting initial therapy, determining the need for and extent of surgery, as well as the need for ongoing monitoring and follow-up care,” he emphasized.

In the study, the researchers examined tumor samples from 314 patients with thyroid cancer (245 with conventional PTC, 73 with follicular thyroid cancer and 29 with the follicular variant of PTC) to determine the presence of BRAF V600E and its association with factors such as tumor size, tumor stage, and patient outcome.

They found the mutation in 51 percent of patients with conventional PTC, in 1 percent of patients with follicular thyroid cancer, and in 24.1 percent of patients with follicular variant PTC.

In conventional PTC and follicular variant PTC, the mutation was significantly associated with older age, larger tumor size, and recurrent and persistent disease. These patients also showed a trend toward a higher rate of cancer formation in the lymph node due to metastasis (the transfer of tumor cells from one organ or part of the body to another organ or part) and higher stage cancer.

In patients with conventional PTC, the mutation was associated with older age, lymph node and other metastasis, and was an independent risk factor for recurrent and persistent disease. Median follow-up time of all patients in this study was six years.

Kebebew explained that identification of the mutation in patients with thyroid cancer could be very useful in a variety of ways. For example, patients with the mutation may be candidates for a more aggressive approach to surgery, such as removing the central lymph node along with the diseased thyroid, to avoid the possibility of metastasis following surgery. BRAF V600E testing could also be useful for deciding between low- or high-dose radioiodine ablation therapy.

“Advances in molecular biology techniques have improved our understanding of the genetic changes in cells that lead to the formation of cancer and have provided opportunities for identifying disease biomarkers like this mutation,” added Kebebew. “It is critical to continue the drive to discover reliable biomarkers so we can better identify, treat and cure cancer.”

The study was funded by the Robert Wood Johnson Foundation, the American Cancer Society Research Scholars Grant, Hellman Family Grant, the University of California Cancer Research Committee and the National Institutes of Health.

Study co-investigators were Julie Weng, BS; Juergen Bauer, MD; Gustavo Ranvier, MD; Orlo Clark, MD; Quan-Yang Duh, MD; Daniel Shibru, MD; Boris Bastian, MD, and Ann Griffin, PhD, all of UCSF.

UCSF is a leading university that advances health worldwide by conducting advanced biomedical research, educating graduate students in the life sciences and health professions, and providing complex patient care.

Vanessa deGier | EurekAlert!
Further information:
http://www.ucsf.edu

Further reports about: BRAF PTC Thyroid conventional follicular

More articles from Life Sciences:

nachricht Scientists spin artificial silk from whey protein
24.01.2017 | Deutsches Elektronen-Synchrotron DESY

nachricht Choreographing the microRNA-target dance
24.01.2017 | UT Southwestern Medical Center

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Scientists spin artificial silk from whey protein

X-ray study throws light on key process for production

A Swedish-German team of researchers has cleared up a key process for the artificial production of silk. With the help of the intense X-rays from DESY's...

Im Focus: Quantum optical sensor for the first time tested in space – with a laser system from Berlin

For the first time ever, a cloud of ultra-cold atoms has been successfully created in space on board of a sounding rocket. The MAIUS mission demonstrates that quantum optical sensors can be operated even in harsh environments like space – a prerequi-site for finding answers to the most challenging questions of fundamental physics and an important innovation driver for everyday applications.

According to Albert Einstein's Equivalence Principle, all bodies are accelerated at the same rate by the Earth's gravity, regardless of their properties. This...

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

Breaking the optical bandwidth record of stable pulsed lasers

24.01.2017 | Physics and Astronomy

Choreographing the microRNA-target dance

24.01.2017 | Life Sciences

Spanish scientists create a 3-D bioprinter to print human skin

24.01.2017 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>