Elderly women with early-stage breast cancer live longer with radiation therapy and surgery compared with surgery alone, researchers at the University of Maryland School of Medicine have found. The researchers, who collected data on almost 30,000 women, ages 70 to 84, with early, highly treatable breast cancer enrolled in a nationwide cancer registry, are reporting their findings at the 54th annual meeting of the American Society for Radiation Oncology.
"Overall survival and breast cancer-specific survival were significantly better at all time points for elderly women with Stage I, estrogen-receptor (ER)-positive breast cancer with no lymph node involvement who received radiation therapy following surgery to remove the tumor," says lead author Randi Cohen, MD, MS, an assistant professor of radiation oncology at the University of Maryland School of Medicine and a physician in the Department of Radiation Oncology at the University of Maryland Marlene and Stewart Greenebaum Cancer Center.
For women who had radiation and a lumpectomy, the overall survival rate was 88.6 percent at five years, 65 percent at 10 years and 39.6 percent at 15 years. That compares with a survival rate of 73.1 percent at five years, 41.7 percent at 10 years and 20 percent at 15 years for women who only had surgery. The median survival was 13 years for patients receiving surgery and radiation, compared with 9.9 years for patients receiving surgery alone. The researchers don't know how many of the women also received hormonal therapy.
"Our findings suggest that adjuvant radiation therapy should be strongly considered as part of the treatment regimen for otherwise healthy elderly women with early ER-positive breast cancer," Cohen says. "A woman's age alone should not dictate whether or not radiation is recommended."
The senior author, Steven Feigenberg, MD, an associate professor of radiation oncology at the University of Maryland School of Medicine and a researcher at the University of Maryland Greenebaum Cancer Center, notes that the data also showed that the use of adjuvant radiation decreased as the women grew older. Eighty percent of women age 70-74 received radiation compared with 61 percent of women age 80-84.
"Breast radiation is the standard of care following lumpectomy for early-stage breast cancer, but previous research suggested that it helped to prevent the cancer from returning in the treated breast but has no impact on survival in older women," Feigenberg says. "As a result, some elderly women may not have been offered radiation therapy as part of their breast cancer treatment. We wanted to look at a large, population based database to determine if radiotherapy does offer some benefits in terms of survival, and we found that it does."
Breast cancer patients typically have radiation treatments five days a week for six weeks following surgery, to prevent the cancer from recurring.