GENEVA — Results from a large-scale observational study1, presented at the European Society for Medical Oncology (ESMO) annual meeting, October 7 – 11 in Copenhagen, Denmark, showed outcome disparities in breast cancer-specific mortality between patients 70 years and greater and those under 70 with a higher breast cancer mortality for the older patients.
Following up on the work of the multinational TEAM study2, which reported worse outcomes for older patients with hormone-receptor-positive (HR+) breast cancer, this study examined Oncotype DX® Breast Recurrence Score® results in patients 70 years and greater versus those under 70. It then evaluated breast cancer-specific mortality in both groups.
In the study, Recurrence Score results were provided to the National Cancer Institute’s SEER registry, the premier source of cancer statistics in the United States, and linked to breast cancer cases. More than 207,320 eligible patients were identified among those with node-negative, HR+ breast cancer diagnosed between 2004 and 2011. The results showed that mortality was indeed higher in patients over 70 who were either not tested with Oncotype DX, or had a Recurrence Score result greater than 18. Patients aged 70 or older also had much lower reported chemotherapy use, supporting continued examination of the often reported issue of under-treatment of the elderly.
“In our modern world, researchers are continually working to refine and streamline breast cancer treatment, including the use of tools such as genomic testing that aims at improving the assessment of prognosis and the prediction of treatment benefit. It is concerning that cancer diagnoses in older patients are rising as the population ages and life expectancy increases, and yet, their treatments and outcomes are unequal when compared to younger patients,” said Prof. Etienne Brain, President of the International Society of Geriatric Oncology. “This landmark study provides insightful data which stress the importance of addressing and improving the care for older patients, including the use of tools that lead to a more personalized treatment strategy for this vulnerable patient group.”
Last year, the European Registration of Cancer Care (EURECCA) study3, a large-scale international comparison of the treatment of elderly patients with non-metastatic breast cancer, showed that there are substantial differences in the use of surgery, hormone therapy and chemotherapy between European countries. According to the study authors, this is due to a lack of evidence for the treatment of older patients with breast cancer.
“The results presented at ESMO reveal disparities in Oncotype DX testing use and patient outcomes, showing poor breast cancer specific survival in untested patients and in those with intermediate and high Breast Recurrence Score results, contrary to the general perception that older women tend to have only low-risk disease,” said Steven Shak, M.D., chief scientific officer, Genomic Health. “These new data reinforce the specific value of examining tumor biology with Oncotype DX in older women and add to unprecedented evidence that the Recurrence Score provides critical information to improve treatment approaches and outcomes in breast cancer patients.”
Additional data solidify utility of Oncotype DX in node-positive breast cancer patients
Two posters were also presented at ESMO providing further evidence in more than 7,300 patients that Oncotype DX accurately predicts outcomes and has important clinical utility in node-positive disease.
In the first study4 from Clalit Health Services (Israel), medical records of more than 700 patients with micro metastases and node-positive disease who were tested between January 2008 and December 2011 were examined to verify given treatment and subsequent outcomes. The results showed that use of chemotherapy was aligned with Recurrence Score results, and that patients with Recurrence Score results of less than 18, the vast majority (92.9%) of whom were treated with hormonal therapy alone, had very good outcomes with low rates of distant recurrence after a median follow-up of 5.9 years.
Another analysis of the SEER registry5 looked at breast cancer-specific survival (BCSS) in more than 6,700 patients with node-positive disease. The results showed that five-year BCSS was excellent in patients with Recurrence Score results less than 18 and micrometastases, one, or two positive nodes. Survival worsened with increasing number of lymph nodes involved and higher Recurrence Score results.
About Oncotype DX
Oncotype DX is the only genomic test validated for its ability to predict the likelihood of chemotherapy benefit as well as risk of recurrence in early-stage breast cancer.
Healthcare systems across Europe are recognizing the value of the test, which is incorporated in all major international clinical guidelines. Following assessment and recommendation by NICE in 2013, the Oncotype DX test is now widely available to patients across the UK. Other European countries that reimburse the test includeSwitzerland, Ireland, Greece and Spain. In France, Oncotype DX is available through a funding mechanism for genomic tests. – PRNewswire