Featured Research

from universities, journals, and other organizations

Genes Linked To Treatment Resistance In Children With Leukemia

Date:
June 4, 2005
Source:
American Society of Hematology
Summary:
In efforts to increase the survival rate of the most common childhood cancer, researchers from St. Jude Children's Research Hospital, the University of Tennessee, and the University of Chicago studied how an individual's genetics might play a role in the effectiveness of chemotherapy drugs. Their findings will be published in the June 15, 2005, issue of Blood, the official journal of the American Society of Hematology.

WASHINGTON (June 2, 2005) -- Today, the most common childhood cancer is cured in about 80 percent of patients; only forty years ago, this number was closer to five percent. In efforts to further increase the survival rate, researchers from St. Jude Children's Research Hospital, the University of Tennessee, and the University of Chicago studied how an individual's genetics might play a role in the effectiveness of chemotherapy drugs. Their findings will be published in the June 15, 2005, issue of Blood, the official journal of the American Society of Hematology.

The researchers studied 246 children with acute lymphoblastic leukemia (ALL), all of whom were assigned to one of two groups that determined the intensity of therapy. Patients with poorer prognostic factors -- 130 children -- were assigned to a high-risk group; the remaining children were enrolled in the lower-risk arm.

In a process known as genotyping, DNA was extracted from the normal blood cells of each child and screened for sixteen common genetic variations. The studied genes code for enzymes which are involved in the metabolism and activity of chemotherapy drugs in the body, and were therefore likely to have effects on treatment outcomes.

In the analysis of the high-risk group, the GSTM1 non-null genotype was associated with hematological relapse, a recurrence of the cancer in the blood and bone marrow and the most common reason for treatment failure in childhood ALL. This risk was further increased if the child also had a TYMS 3/3 genotype. No genotype was associated with hematological relapse among patients in the lower-risk arm of the study.

The researchers also looked for evidence of leukemia in each patient's central nervous system (CNS), a region that is vulnerable to infiltration by cancer cells. Genetic variations may have particular impact on how drugs penetrate the "blood-brain" barrier that protects the CNS. For patients in the high-risk arm, the VDR FokI genotype was found to be prognostic for CNS relapse, especially when combined with a VDR intron 8 genotype. In the low-risk group, the TYMS 3/3 genotype was a risk factor.

For children with these unfavorable genotypes, a potential solution may be using drugs that are not affected by these particular enzymes or increasing the dosage of drugs that are. And, in the future, a simple blood test may be all that's needed to make that determination.

"This research showcases a new direction for cancer treatment -- personalized chemotherapy based on the genetics of the patient," said Mary Relling, Pharm.D., St. Jude faculty member and lead study author. "In our study, several common genetic variations were found to predict the outcomes of leukemia patients, demonstrating that genotyping may become an important tool for tailoring treatment and improving an individual's chance of a cure."

###

This work was supported by grants from the National Cancer Institute and the NIH/NIGMS Pharmacogenetics Research Network and Database; by a Center of Excellence grant from the State of Tennessee; and by American Lebanese Syrian Associated Charities (ALSAC).

The American Society of Hematology (www.hematology.org) is the world's largest professional society concerned with the causes and treatment of blood disorders. Its mission is to further the understanding, diagnosis, treatment, and prevention of disorders affecting blood, bone marrow, and the immunologic, hemostatic, and vascular systems, by promoting research, clinical care, education, training, and advocacy in hematology.

Blood, the official journal of the American Society of Hematology, is the most cited peer-reviewed publication in the field. Blood is issued to Society members and other subscribers twice per month, available in print and online at www.bloodjournal.org.


Story Source:

The above story is based on materials provided by American Society of Hematology. Note: Materials may be edited for content and length.


Cite This Page:

American Society of Hematology. "Genes Linked To Treatment Resistance In Children With Leukemia." ScienceDaily. ScienceDaily, 4 June 2005. <www.sciencedaily.com/releases/2005/06/050604184451.htm>.
American Society of Hematology. (2005, June 4). Genes Linked To Treatment Resistance In Children With Leukemia. ScienceDaily. Retrieved July 30, 2014 from www.sciencedaily.com/releases/2005/06/050604184451.htm
American Society of Hematology. "Genes Linked To Treatment Resistance In Children With Leukemia." ScienceDaily. www.sciencedaily.com/releases/2005/06/050604184451.htm (accessed July 30, 2014).

Share This




More Health & Medicine News

Wednesday, July 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Generics Eat Into Pfizer's Sales

Generics Eat Into Pfizer's Sales

Reuters - Business Video Online (July 29, 2014) Pfizer, the world's largest drug maker, cut full-year revenue forecasts because generics could cut into sales of its anti-arthritis drug, Celebrex. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
Nigeria Ups Ebola Stakes on 1st Death

Nigeria Ups Ebola Stakes on 1st Death

Reuters - Business Video Online (July 29, 2014) Nigerian authorities have shut and quarantined a Lagos hospital where a Liberian man died of the Ebola virus, the first recorded case of the highly-infectious disease in Africa's most populous economy. David Pollard reports Video provided by Reuters
Powered by NewsLook.com
Running 5 Minutes A Day Might Add Years To Your Life

Running 5 Minutes A Day Might Add Years To Your Life

Newsy (July 29, 2014) According to a new study, just five minutes of running or jogging a day could add years to your life. Video provided by Newsy
Powered by NewsLook.com
Ebola Outbreak Poses Little Threat To U.S.: CDC

Ebola Outbreak Poses Little Threat To U.S.: CDC

Newsy (July 29, 2014) The Ebola outbreak in West Africa poses little threat to Americans, according to officials with the Centers for Disease Control and Prevention. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins