Contrary to clinical recommendations, older women with early stage
breast cancer may want to undergo radiation after lumpectomy to help
ensure that they will not need a mastectomy in the future. That is the
conclusion of a new study published early online in CANCER, a
peer-reviewed journal of the American Cancer Society. The findings
indicate that current thinking on the risks and benefits of radiation
for early stage breast cancer in older women may be inaccurate.
National treatment guidelines state that older women with early stage
breast cancer that has not spread to the lymph nodes and that is driven
by estrogen in the body can be treated with lumpectomy and estrogen
blockers without the need for radiation. Benjamin Smith, MD, of The
University of Texas MD Anderson Cancer Center in Houston, and his
colleagues evaluated information on 7,403 women aged 70 to 79 years who
were treated with lumpectomy for such breast cancers between 1992 and
2002 and whose data were contained in the Surveillance, Epidemiology,
and End Results-Medicare database, which links cancer registry
information to a master file of Medicare enrollment. Approximately 88
percent of these women received radiation after their lumpectomy.
When the investigators looked to see what happened to these women after
their breast cancer was treated, they found that within 10 years after
treatment, 6.3 percent of women who did not get radiation eventually had
their breast removed by mastectomy, compared with only 3.2 percent of
women who received radiation. The reasons for mastectomy are not
reported by this dataset, but the most likely reason for mastectomy in
this patient group is recurrence of cancer in the breast. The
researchers were also able to identify which women were more and less
likely to benefit from radiation. Specifically, radiation did not seem
to benefit women ages 75 to 79 years with non-high grade tumors (which
contain cells that look only moderately abnormal under a microscope),
suggesting that this group can probably skip radiation. Patients with
high grade tumors (which contain very abnormal-looking cells),
regardless of age, seemed to derive the most benefit from radiation.
“These data are important because they suggest that radiation is likely
of some benefit to certain women where national guidelines say that
radiation is not needed,” said Dr. Smith. “Our data could be helpful to
women when they decide whether or not to undergo radiation,” he added.
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