October 25,
2010: Philadelphia, PA: Are some women with breast cancer being over-treated
with chemotherapy? Breast cancer experts are completing an important milestone
this month in their research to answer this question, as they complete accrual
of over 10,000 women with early stage breast cancer to the TAILORx clinical
trial. TAILORx or "Trial Assigning IndividuaLized Options
for Treatment (Rx)” is a clinical research trial for women with
early-stage breast cancer. It is the first breast cancer clinical trial ever
conducted which integrates a state-of-the-art gene expression assay into the
clinical decision-making process. When the final results become available, this
federally funded trial will help identify in which patients adjuvant hormonal
therapy alone is sufficient treatment, thus eliminating the empiric use of
chemotherapy in tens of thousands of women with early stage breast cancer each
year.
“This is a
groundbreaking trial” said Robert L. Comis, MD, Chair of the Eastern
Cooperative Group (ECOG), which coordinated the study with funding provided by
the National Cancer Institute. “In today’s era of personalized medicine,
prospective clinical trials like TAILORx are critical to translating what we’ve
learned about cancer biology into individualizing therapy, so that we can treat
the right patient with the right therapy at the right time. When the results
become available within the next five years, they will shed light on who really
benefits from chemotherapy.”
The trial
included women age 18-75 with estrogen-receptor positive, lymph node negative
stage I or II breast cancer, all of whom met standard clinical guidelines for
receiving chemotherapy in order to reduce the risk of cancer recurrence after
surgery. All patients had an Oncotype DX® Recurrence Score®
test performed on their tumor sample, which is a gene expression assay test
available from Genomic Health, Inc. The test measures the activity level of a
panel of genes within the tumor sample, and the result correlates with the
likelihood of having breast cancer recurrence. Tumors with a low Recurrence
Score are likely to be cured with surgery and hormonal therapy alone. Tumors
with a high Recurrence Score have a high recurrence rate with hormonal therapy
and require chemotherapy to reduce the post-surgery recurrence risk. Women in
the study will be followed for up to 20 years. “The Recurrence Score test
results provided a clear treatment path for about one-third of women who
participated in the trial because their score was either low or high.” said
Joseph Sparano, MD, the principal investigator of the trial. “The remaining
two-thirds of women with a mid-range score tumor were the focus of this trial
because we have strong reason to believe that they don’t benefit from
chemotherapy. We needed a large-scale clinical trial to prove whether
chemotherapy is benefiting this group, or not.”
“This is a
very important trial, no matter what the results turn out to be”, said Mary Lou
Smith, a breast cancer survivor who serves as the co-chair of the ECOG Patient
Representative Committee. “The research team asked what concerns patients might
have from the very beginning, and sought advice on how to design a trial that
would be acceptable to patients. I think that effort proved to be critical to
its success.” The trial received funding from the Breast Cancer Research
Foundation, which provides critical grants for innovative clinical and genetic
research. It was endorsed by the National Breast Cancer Coalition, an advocacy
group which supports increased funding for breast cancer care and research. In
2008, the Coalition of Cancer Cooperative Groups and its Scientific Leadership
Council in Breast Cancer deemed TAILORx a High Priority Trial and
distinguished it as such in TrialCheck®, its Internet-based protocol
navigation and patient-matching system for all federally (U.S.) registered
cancer clinical research studies.
TAILORx was
coordinated by the NCI-sponsored Eastern Cooperative Oncology Group, and
performed by ECOG, Southwest Oncology Group, Cancer and Leukemia Group B, North
Central Cancer Treatment Group, National Surgical Adjuvant Breast and Bowel
Project, National Cancer Institute of Canada, Radiation Therapy Oncology Group,
and the American College of Surgery Oncology Group. About 9,000 patients were
accrued in the United States, whereas the remainders were accrued in Ireland,
Peru, Canada, and Australia. The trial included over 900 centers on four
continents. “This trial received not only an unprecedented degree of
collaboration by the cancer research community, but also unwavering support
from our patients,” said Dr. Comis.
TAILORx
also seeks to determine if the Oncotype DX assay will be helpful in
future treatment planning for this group of women. The initial studies that
established the importance of the Oncotype DX test resulted from a
research collaboration between the NSABP (noted above) and Genomic Health, Inc.
The results of the NSABP B-14 trial established the prognostic value of the
assay while the NSABP B-20 trial established the predictive value of the assay
in determining the magnitude of chemotherapy benefit. “These trials, along with
TAILORx are examples of how federally funded cancer cooperative groups can
successfully partner with industry for the benefit of patients” said Steve
Shak, MD, Chief Medical Officer of Genomic Health. “We are proud that Oncotype
DX testing is playing such a critical role in the TAILORx trial.”
Most of the
10,000 women participating in the trial also agreed to have their tumor and
blood specimens banked for evaluating other cancer tests in future. “The banked
specimens from TAILORx will be a valuable resource for developing even better
tests in the future”, said Dr. Sparano.
The
Coalition of Cancer Cooperative Groups is a non-profit service organization
working to improve physician and patient access to cancer clinical trials
through education, outreach, advocacy and research. Its Board Members are
the chairs of the United States’ Cancer Cooperative Groups, the publicly-funded
cancer research networks sponsored by the National Cancer Institute. Its web
site is www.CancerTrialsHelp.org.
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Breast
cancer is the most frequently diagnosed cancer in women, with an estimated
207,090 new cases of invasive breast cancer expected in the United States in
2010 (American Cancer Society). About one-half of these women will have
estrogen receptor positive, lymph node negative breast cancer. For 80-85
percent of those women, the current standard treatment practice is surgical
excision of the tumor, followed by radiation and hormonal therapy. Chemotherapy
is also currently recommended for most women (Also see National Cancer
Institute:
http://www.cancer.gov/newscenter/pressreleases/TAILORxRelease.)