Breast Cancer Conference Highlights
Main Category: Breast CancerAlso Included In: Genetics
Article Date: 08 May 2009 - 5:00 PDT
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GENE SIGNATURE IDENTIFIES BREAST CANCER PATIENTS WHO WILL RESPOND TO CHEMOTHERAPY
Researchers have identified a genetic signature that can predict which breast cancer patients will respond well to treatment with epirubicin, a widely used form of chemotherapy. Although among the most effective chemotherapies in breast cancer, a small proportion of women suffer severe side-effects. By identifying those women who are most likely to benefit from treatment, doctors may be able to ensure fewer women are unnecessarily exposed to that risk. The new study shows that this goal can be achieved by developing more sophisticated ways to use older drugs.
GENE SIGNATURE PREDICTS GOOD OUTCOME IN BREAST CANCER
Researchers have identified a genetic signature that can predict an improved clinical outcome in patients with breast cancer, and which could help in the development of new targeted therapies. By analysing the expression of different genes induced by a specific mutation in a molecule called PIK3CA, a critical part of the pathway commonly deregulated in breast cancer, they found that these genes were correlated with an improved clinical outcome in over 1500 women with the disease.
GENETIC TEST REDUCES NEED FOR SECOND SURGERY IN BREAST CANCER TREATMENT
A new rapid test can confirm quickly and accurately that breast cancer has most likely not spread into adjacent lymph nodes, offering reassurance to patients and reducing the need for a second operation. The new technique allows you to make the diagnosis of micro metastases while the surgery is underway, meaning the patient does not have to suffer the disruption of undergoing another operation.
ANDROGEN-RECEPTOR: A NEW DRUG TARGET IN BREAST CANCER
New results may help scientists develop treatments for women with a type of breast cancer that currently does not respond to targeted therapies. Some cancers (triple-negative tumors) generally do not respond to receptor-targeted treatments. In recent years, scientists have begun looking for new targets in these "triple-negative" cancers. One that has been identified is the androgen-receptor.
Source:
ESMO Press Office
European Society for Medical Oncology
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Effective Clinical Responders
posted by Gregory D. Pawelski on 10 May 2009 at 6:25 pmSome researchers have put enormous efforts into genetic profiling as a way of predicting patient response (clinical responders) to various therapies. However, none of the genetic tests can predict clinical responders. Molecular predisposing mechanisms do not guarantee that a drug (or combination of drugs) will be effective for an individual patient. Drugs can work in ways that we don't suspect. A more suitable platform can be used to utilize cell-based tests to better select a repertoire of available drugs to improve the efficacy of chemotherapy.
A challenge facing pharmacogenetics is the number and complexity of interactions a drug has with biological molecules in the body. Variations in many different molecules may influence how someone responds to a medicine. Teasing out the genetic patterns associated with particular drug responses could involve some intricate and time-consuming scientific detective work.
Several new targeted drugs have been introduced during the last few years. Most of them have been developed for use in solid tumors but some have also emerged for hematological maligancies. These new targeted drugs mostly need to be combined with active chemotherapy to provide any benefit and the need for predictive tests for individualized therapy selection has increased.
Unfortunately, the introduction of these new drugs has not been accompanied by specific predictive tests allowing for a rational and economical use of the drugs. Drugmakers have said that pharmacogenetics will not change the landscape for the bulk of pharmaceuticals for several years. Pharmacogenetics is not going to transform the market any time soon.
There are a number of laboratory tests that are better able to predict the ability of targeted drugs, to produce positive clinical responders (outcomes). Given the technical and conceptual advantages of oncologic in vitro chemoresponse assays, together with their performance and the modest efficacy of therapy prediction based on analysis of genome expression, there is reason for a renewal in the interest for these tests for optimized use of medical treatment of malignant disease.
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