"In order to identify patients at high risk, physicians must take thorough family histories and then accurately interpret that information, something that can be difficult since many nuances can determine risk," says Kevin Hughes, MD, of the MGH Surgical Oncology Division, the study's senior author. "In addition, family history can change over time if a patient's relatives develop cancer. We need an easier way to both update data and reevaluate each patient's situation."
Previous research has shown that about 20 percent of women who develop breast or ovarian cancer have family histories that suggest they may have inherited a mutation that would put them at elevated risk. In comparison, the family histories of only 3 to 6 percent of women who had not developed those cancers indicate elevated risk. The current study was designed to further investigate the extent to which women with these mutations are not being identified and to evaluate a less labor-intensive method of collecting and analyzing family history information.
During the eight-month study period, about 14,000 women who came to the Avon Breast Evaluation Center at MGH completed a questionnaire on their family history of breast or ovarian cancer, whether they had developed any tumors and related factors. The information was gathered either with written questionnaires scanned into a computer or on handheld tablet computers. It was downloaded into a database that was immediately available to the patients' physicians and was later analyzed with a protocol designed to evaluate the risk that the patients carried mutations in BRCA1 or BRCA2, the so-called "breast-cancer genes."
Among the 1,764 participants who had been diagnosed with breast or ovarian cancer, 20.6 percent had family histories indicating elevated risk of one of the tumor-associated mutations. Risk levels were even higher among participants who'd had ovarian cancer and those of Ashkenazi Jewish ancestry, a group known to have higher incidence of the mutations. The earlier study that found similar risk levels used a more complicated risk-assessment procedure conducted by a genetic counselor, a resource not available in many centers.
"We wanted to show we could identify these high-risk women with an automated system that provides accurate information without requiring more work for our staff, an approach that has been tried in very few centers worldwide," says Hughes. "In addition to verifying the utility of this strategy, these results remind us how many women who should be tested for these genetic mutations are not being screened." Hughes is an assistant professor of Surgery at Harvard Medical School.
The researchers note that women diagnosed with the cancer-associated mutations can pursue a number of options. Preventive approaches include treatment with tamoxifen or contraceptive drugs and prophylactic removal of the breasts or ovaries. More frequent screenings with mammograms and MRI imaging can lead to early diagnosis. And for those who develop tumors, mutation status can help determine the best treatment strategies. The team is continuing to administer the questionnaire to patients at the MGH and will begin doing so at Newton-Wellesley Hospital, an affiliated institution, in the near future. They also will investigate methods for informing women of their mutation status and managing the expected increase in patients requiring follow-up care.
The study's co-authors are lead author Francisco Dominguez, MD, along with Julie Jones, MD, Katherina Zabicki, MD, Barbara Smith, MD, PhD, Michele Gadd, MD, Michele Specht, MD, and James Michaelson, PhD, of MGH Surgical Oncology; and Daniel Kopans, MD and Richard Moore of MGH Breast Imaging.
Massachusetts General Hospital, established in 1811, is the original and largest teaching hospital of Harvard Medical School. The MGH conducts the largest hospital-based research program in the United States, with an annual research budget of more than $450 million and major research centers in AIDS, cardiovascular research, cancer, cutaneous biology, medical imaging, neurodegenerative disorders, transplantation biology and photomedicine. In 1994, MGH and Brigham and Women's Hospital joined to form Partners HealthCare System, an integrated health care delivery system comprising the two academic medical centers, specialty and community hospitals, a network of physician groups, and nonacute and home health services.
Journal
Cancer