Science news and articles on health, environment, global warming, stem cells, bird flu, autism, nanotechnology, dinosaurs, evolution -- the latest discoveries in astronomy, anthropology, biology, chemistry, climate & bioengineering, computers, engineering ; medicine, math, physics, psychology, technology, and more from the world's leading research centers universities.

BRCA1 mutations in breast and ovarian cancer can predict treatment resistance

0

Mutations in the BRCA1 gene are one of the most common risk factors for breast and ovarian cancers. Although tumors that harbor BRCA1 mutations initially respond well to cancer treatments, many tumors eventually become less responsive. This month, two studies in the JCI investigated the mechanisms underlying the treatment resistance associated with some BRCA1 mutations, and the findings provide information that may help predict which treatments will be effective in women with breast and ovarian cancer. A team led by Jos Jonkers at the Netherlands Cancer Institute discovered that a mouse harboring an analog of the cancer-associated human BRCA1 mutation, BRCA1184delAG, expresses a BRCA1 protein that is missing a structural component called a RING domain. Loss of the RING domain predicted poor treatment responses in both mouse and human mammary tumors. Neil Johnson's lab at the Fox Chase Cancer Center examined treatment resistance in breast cancer cells expressing the same BRCA1185delAG mutation and determined that the RING-deficient BRCA1 protein was also responsible for loss of sensitivity to certain types of cancer treatments. These findings identify specific BRCA1 mutations that are more likely to develop therapy resistance, which may lead to more accurate predictions and personalized treatments for breast and ovarian cancers.

###

TITLE: BRCA1185delAG tumors may acquire therapy resistance through expression of RING-less BRCA1

AUTHOR CONTACT:

Jos Jonkers
The Netherlands Cancer Institute
[email protected]

View this article at: http://www.jci.org/articles/view/70196?key=cb1e1f99e09ebc5f9968

TITLE: RING domain-deficient BRCA1 promotes PARP inhibitor and platinum resistance

AUTHOR CONTACT:

Neil Johnson
Fox Chase Cancer Center
[email protected]

View this article at: http://www.jci.org/articles/view/87033?key=b2ea8ecc2fb8259747b7

ACCOMPANYING COMMENTARY

TITLE: BRCA1 loses the ring but lords over resistance

AUTHOR CONTACT:

Simon N Powell
Memorial Sloan-Kettering Cancer Center
[email protected]

View this article at: http://www.jci.org/articles/view/89209?key=3db05e2a614e0d24d29e

Media Contact

Elyse Dankoski
[email protected]
@jclinicalinvest

http://www.jci.org

Leave A Reply

Your email address will not be published.