Veracyte Announces New Data Published in Journal of Clinical Oncology Suggest the Prosigna Breast Cancer Test’s Genomic Underpinning Drives Prognostic Performance
The study compared the commercial forms of four breast cancer recurrence-risk tests: the PAM50-based Prosigna Risk of Recurrence (ROR), the Oncotype DX Risk Score (RS), EndoPredict (EP) and Breast Cancer Index (BCI). It expands upon a previous evaluation of these same tests using an identical dataset, which compared their ability to accurately predict 10-year distant disease recurrence.1 The new study was intended to help determine why these tests commonly generate discordant results and thereby help to inform long-term therapeutic decision-making.
Researchers evaluated 785 patient samples from the TransATAC dataset using each of the four tests and then compared the resulting recurrence risk scores. Their comparisons included the molecular features driving each of the scores, without the clinicopathologic features that are integrated into the final prognostic result for the Prosigna ROR, EP and BCI. All TransATAC samples were derived from the randomized
“Gene expression assays can help physicians identify which ER+ breast cancer patients can safely avoid chemotherapy, a decision that can have meaningful clinical and quality-of-life implications,” said
Study results showed that there was low correlation between the Oncotype DX RS and the Prosigna ROR score, and between the RS and BCI scores. Researchers subsequently determined that genes predicting tumor proliferation (i.e., the rate at which cancer cells divide) accounted for 72.5% of the difference between the RS and Prosigna score and 54.3% of the difference between the RS and BCI scores. Among the four tests, researchers found that the Prosigna ROR score relies most heavily on proliferation-related features, while the RS is determined much more strongly by estrogen-related features. Tumor proliferation is known to be an important and reliable indicator of distant disease recurrence and is indicative of response to chemotherapy.
“Clarity about the relative influence of the proliferation vs. estrogen modules in each of these gene expression assays is important for several reasons, including the fact that this information helps clinicians evaluate the relative benefit of endocrine therapy alone vs. endocrine therapy plus chemotherapy for individual patients,” said
The Prosigna Breast Cancer Prognostic Gene Signature Assay, which is powered by the PAM50 gene signature, uses advanced genomic technology to classify breast cancers based on key biomarkers and the likelihood of cancer recurrence. Outside of
“The findings from this study further validate the molecular biology underlying the accuracy of our Prosigna test,” said
Prosigna is a prognostic Breast Cancer Gene Signature assay indicated in female breast cancer patients who have undergone either mastectomy or breast-conserving therapy in conjunction with locoregional treatment consistent with standard of care, either as a prognostic indicator for distant recurrence-free survival at 10 years in post-menopausal women with Hormone Receptor-Positive (HR+), lymph node-negative, Stage I or II breast cancer or lymph node-positive (1–3 positive nodes, or 4 or more positive nodes), Stage II or IIIA breast cancer to be treated with adjuvant endocrine therapy alone, when used in conjunction with other clinicopathological factors. Outside of the
The Prosigna test is FDA 510(k) cleared in
Cautionary Note Regarding Forward-Looking Statements
This press release contains forward-looking statements, including, but not limited to, our statements related to our plans, objectives, expectations (financial and otherwise) or intentions with respect to Veracyte’s Prosigna® Breast Cancer Gene Signature Assay for use in predicting long-term risk of recurrence among breast cancer patients. Forward-looking statements can be identified by words such as: "anticipate," "intend," "plan," "expect," "believe," "should," "may," "will" and similar references to future periods. Actual results may differ materially from those projected or suggested in any forward-looking statements. Examples of forward-looking statements include, among others, statements regarding Veracyte’s belief that its Prosigna “PAM50” molecular classifier helps physicians accurately predict long-term risk of recurrence among breast cancer patients. These statements involve risks and uncertainties, which could cause actual results to differ materially from our predictions, and include, but are not limited to: Veracyte’s ability to achieve and maintain Medicare coverage for its tests, the benefits of Veracyte’s tests and the applicability of clinical results to actual outcomes. Factors that may impact these forward-looking statements can be found in Item 1A – “Risk Factors” in our Annual Report on Form 10-K filed with the
1 Sestak I., Buus R., et. al. Comparison of the Performance of 6 Prognostic Signatures for Estrogen Receptor-Positive Breast Cancer: A Secondary Analysis of a Randomized Clinical Trial. JAMA Oncol. 2018
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