Multi-Center Study Provides Guidelines For Genetic Testing In Women With Breast Cancer: BRCA Abnormalities Multiply Risk Of Ovarian Cancer

June 29, 1998

A study published in the July issue of the Journal of Clinical Oncology provides new guidelines to help physicians recognize which women should be assessed for hereditary breast and ovarian cancer. Scientists at 12 of the country's leading hereditary cancer centers collaborated with Myriad Genetic Laboratories to examine 238 women diagnosed with breast cancer before age 50 or with ovarian cancer at any age, who had at least one relative with either disease.

Nearly 40% of the participants were found to have abnormalities in either of two genes responsible for most hereditary breast and ovarian cancer, BRCA1 and BRCA2, that led to their cancer.

"This study tells as that all women with breast cancer diagnosed under age 50, and any woman with a history of breast or ovarian cancer in a close relative, should be tested," suggests coauthor Funmi Olopade, M.D., associate professor of medicine and director of the Cancer Risk Clinic at the University of Chicago Medical Center.

"This is important because women and their doctors have struggled with the issue of who should be advised to be tested for hereditary breast and ovarian cancer," said Olopade.

"The data in this study enabled us to create a simple table that indicates a woman's likelihood of having inherited an abnormality in either of the two major breast-ovarian cancer genes, based on her personal and family history of breast and ovarian cancer."

In contrast to previous studies, the study did not find that women of Ashkenazi Jewish ancestry were more likely to carry a mutation in BRCA1 or BRCA2 compared to women of other ethnic backgounds. This is probably because "this the first study to test for BRCA1 and BRCA2 in a large number of women from diverse ethnic backgrounds," explained Olopade.

"Most studies up to now have looked only at BRCA1, and so we've only had half the story," said coauthor Tom Frank M.D. of Myriad Genetic Laboratories. "By looking at the entire sequences of both genes in all of the participants, and comparing the results to their family history, we were able to develop clear guidelines to help physicians identify patients who should be evaluated for hereditary breast and ovarian cancer."

Another of the study's findings suggests that breast cancer survivors should try to find out if they have the hereditary form of the disease; abnormalities in BRCA1 and BRCA2 in women with breast cancer were found to be associated with a 10-fold increase in the risk of developing ovarian cancer.

One of the most important findings of the study, note the authors, was the observation that women with breast cancer who have mutations in either gene have this sharply elevated risk, which was previously associated only with BRCA1.

Most women with breast cancer are not at a significantly increased risk of ovarian cancer, and so the possibility of this disease does not factor into their health care. This study suggests that their doctors should know if a patient has the hereditary form of breast cancer so that her risk of ovarian cancer can be assessed and managed appropriately, with increased surveillance or consideration of prophylactic ovary removal (oopherectomy).

University of Chicago Medical Center

Related Breast Cancer Articles from Brightsurf:

Oncotarget: IGF2 expression in breast cancer tumors and in breast cancer cells
The Oncotarget authors propose that methylation of DVDMR represents a novel epigenetic biomarker that determines the levels of IGF2 protein expression in breast cancer.

Breast cancer: AI predicts which pre-malignant breast lesions will progress to advanced cancer
New research at Case Western Reserve University in Cleveland, Ohio, could help better determine which patients diagnosed with the pre-malignant breast cancer commonly as stage 0 are likely to progress to invasive breast cancer and therefore might benefit from additional therapy over and above surgery alone.

Partial breast irradiation effective treatment option for low-risk breast cancer
Partial breast irradiation produces similar long-term survival rates and risk for recurrence compared with whole breast irradiation for many women with low-risk, early stage breast cancer, according to new clinical data from a national clinical trial involving researchers from The Ohio State University Comprehensive Cancer Center - Arthur G.

Breast screening linked to 60 per cent lower risk of breast cancer death in first 10 years
Women who take part in breast screening have a significantly greater benefit from treatments than those who are not screened, according to a study of more than 50,000 women.

More clues revealed in link between normal breast changes and invasive breast cancer
A research team, led by investigators from Georgetown Lombardi Comprehensive Cancer Center, details how a natural and dramatic process -- changes in mammary glands to accommodate breastfeeding -- uses a molecular process believed to contribute to survival of pre-malignant breast cells.

Breast tissue tumor suppressor PTEN: A potential Achilles heel for breast cancer cells
A highly collaborative team of researchers at the Medical University of South Carolina and Ohio State University report in Nature Communications that they have identified a novel pathway for connective tissue PTEN in breast cancer cell response to radiotherapy.

Computers equal radiologists in assessing breast density and associated breast cancer risk
Automated breast-density evaluation was just as accurate in predicting women's risk of breast cancer, found and not found by mammography, as subjective evaluation done by radiologists, in a study led by researchers at UC San Francisco and Mayo Clinic.

Blood test can effectively rule out breast cancer, regardless of breast density
A new study published in PLOS ONE demonstrates that Videssa® Breast, a multi-protein biomarker blood test for breast cancer, is unaffected by breast density and can reliably rule out breast cancer in women with both dense and non-dense breast tissue.

Study shows influence of surgeons on likelihood of removal of healthy breast after breast cancer dia
Attending surgeons can have a strong influence on whether a patient undergoes contralateral prophylactic mastectomy after a diagnosis of breast cancer, according to a study published by JAMA Surgery.

Young breast cancer patients undergoing breast conserving surgery see improved prognosis
A new analysis indicates that breast cancer prognoses have improved over time in young women treated with breast conserving surgery.

Read More: Breast Cancer News and Breast Cancer Current Events is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to