Navigation Links
Study shows PET can measure effectiveness of novel breast cancer treatment
Date:7/2/2009

RESTON, Va.A new study published in the July issue of The Journal of Nuclear Medicine shows that positron emission tomography (PET) scans in mice can be used to determine whether a novel type of breast cancer treatment is working as intended. Researchers successfully used PET and a specially-developed radioactive compound to image HER2a protein often associated with aggressive breast cancerin breast cancer cells before and after treatment aimed at decreasing HER2 expression. This molecular imaging methodology could facilitate development of new targeted therapies not only for breast cancer, but also for certain types of ovarian, prostate, and lung cancers that may be aggravated due to HER2.

"Obtaining an accurate assessment of the HER2 expression levels in breast cancer tumors is absolutely essential to know whether treatment aimed at reduction of the protein levels in tumor cells is effective," said Jacek Capala, senior author of the study and investigator for the radiation oncology branch of the National Cancer Institute, National Institutes of Health, Bethesda, Md. "Our study indicates that PET could be a powerful tool both to identify patients who might benefit from targeted molecular therapies and to manage their care by measuring response to treatment. As research into HER2 therapies continues, similar techniques could be developed for other cancers overexpressing different proteins."

Much new research has been focused on developing therapies targeted to HER2. This protein is overexpressed in approximately 20 percent of breast cancers and also in some ovarian, prostate and lung cancers. Tumors that have an overabundance of HER2 protein are more aggressive and more likely to recur than tumors that do not overexpress the protein.

The imaging technique developed in the study represents a breakthrough in measuring HER2 expression. The conventional method requires biopsies of tumors that have been removed from the body; however, these samples may not represent the overall characteristics of the tumor and may not accurately estimate HER2 expression. In addition, there are currently no means to evaluate how long a therapeutic agent takes to affect the targeted tumors and how long the effects last.

In the study, researchers attached the radioactive nuclide flourine-18 to an HER2-binding variant of a small protein known as an Affibody molecule. PET scans can detect the Affibody compound and allow researchers to visualize breast cancer tumors with HER2 protein in mice. These molecules can also be engineered to specifically bind to other targets for cancer diagnosis and therapy.

The researchers implanted human breast cancer cellsexpressing either very high or high levels of HER2under the skin of mice to show that this method of imaging can be used to monitor changes in HER2 expression after treatment. Researchers then intravenously injected the HER2-targeting Affibody compound and performed PET imaging three to five weeks after tumors had formed. Four doses of the drug 17-DMAG were administered, which decreases HER2 expression, spaced 12 hours apart. PET scans were performed before the treatment and after each dose.

The researchers found that HER2 expression was reduced by 71 percent in mice bearing tumors with very high levels of HER2 protein and by 33 percent in mice bearing tumors with high levels of the protein, compared to the levels measured before treatment and to tumors that did not receive the treatment. Researchers confirmed their data using established laboratory techniques to determine the concentrations of HER2 proteins in the same tumors after they were removed from the mice.


'/>"/>

Contact: Amy Shaw
ashaw@snm.org
703-652-6773
Society of Nuclear Medicine
Source:Eurekalert

Related medicine news :

1. New Study Shows Many Unplanned Quit Smoking Attempts are Successful
2. Study examines dietary influences of liver disease
3. Study examines liver transplantation after drug induced acute liver failure
4. Study Supports Wider Use of Statins
5. Study identifies biomarker that safely monitors tumor response to new brain cancer treatment
6. The European Association for the Study of the Liver renews publishing partnership with Elsevier
7. Study to see if video games can boost thinking skills in elderly
8. GIE: Gastrointestinal Endoscopy June issue study highlights
9. Study shows 1 in 25 deaths worldwide attributable to alcohol
10. Veterans Affairs Researchers Study Benefits of Robot for Ankle Rehabilitation
11. U-M study finds voice box can be preserved, even with the largest cancers
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/10/2016)... ... February 10, 2016 , ... Ongoing news of the ravages ... Association™ (ALCA) to conduct a survey that takes a closer look at cases of ... the prevalence and causes of TBI among the aging population, and identifies the challenges ...
(Date:2/10/2016)... ... February 10, 2016 , ... United Benefit Advisors (UBA), the ... addition to its growing list of Partner Firms. S.S. Nesbitt is headquartered ... to Huntsville and in between. , Harnessing the experience and insights of the ...
(Date:2/10/2016)... , ... February 10, 2016 , ... AxoGen, Inc. (NASDAQ: ... report results for the fourth quarter and full year ended December 31, 2015 on ... conference call and webcast for the investment community following the release at 4:30 PM ...
(Date:2/10/2016)... ... ... AHRA: The Association for Medical Imaging Management announced today ... as keynote speaker at the organization’s 2016 Spring Conference. Fox’s topic, Lead with ... with their own organizational staff and leadership. , “I am so excited ...
(Date:2/10/2016)... ... February 10, 2016 , ... For additional information contact ... , Pioneering book "Better with Age: The Ultimate Guide to Brain Training" by award-winning ... improve memory. The book’s publication date is March 16, 2016. A free review ...
Breaking Medicine News(10 mins):
(Date:2/10/2016)... , February 10, 2016 --> --> ... Japan .  --> Japan .  --> A ... With submission, Shire continues to strengthen ... With submission, Shire continues to strengthen its presence ... submission, Shire continues to strengthen its presence ...
(Date:2/10/2016)... SEATTLE , Feb. 10, 2016  Resolve ... potentially transformative new approaches to the treatment of ... completion of a multiple ascending dose study in ... lead compound RSLV-132. --> ... double-blind, placebo-controlled multiple ascending dose study of RSLV-132 ...
(Date:2/10/2016)... YORK , Feb. 10, 2016 Immune ... biopharmaceutical company, announced today that it has filed a ... Leukemia and other cancers. --> ... treating cancer by administration of Ceplene (histamine dihydrochloride) in ... provides methods of predicting the efficacy of Ceplene and ...
Breaking Medicine Technology: