Comparing Oncotype DX Recurrence Score Categories with Immunohistochemically Defined Luminal Subtypes
نویسندگان
چکیده
Background: At the 13th St Gallen International Breast Cancer Conference in 2013, a new definition of luminal A-like and luminal B-like breast cancer was proposed, involving the expression of estrogen receptor (ER), progesterone receptor (PgR), and Ki-67. We examined the rate of concordance between the risk groups using the Oncotype DX recurrence score (RS) and the previous and newly proposed luminal subtypes with the standardized Ki-67 assessment. Method: The relationship between a previously and newly proposed, immunohistochemically defined luminal A and B subtype with the Oncotype DX RS of 41 cases of T1-2 N0-1 M0 (ER positive, HER2 negative) breast cancer was assessed. We first classified the patients into the previously defined luminal A and B subtypes, according to the level of Ki-67 as either “low” (<14%) or “high” (≥14%), as assessed by local pathologists. Next, to consider the necessity for standardizing Ki-67 measurement methods, we re-examined Ki-67 with a central review. By introducing PgR positivity (≥20%), we classified these patients to newly proposed luminal subtypes and compared them with the risk groups stratified by Oncotype DX RS. Results: In the previously proposed luminal subtypes, the concordance rate between luminal A and the low RS category was 76.5% according to local pathologists and 90.1% by central review, whereas the rate between luminal B and the intermediate to high RS category was 46.7% and 45.8%, respectively. In newly proposed luminal subtypes, the concordance rate between luminal A and low RS category was 100% and between the luminal B and intermediate to high RS category was 53.6%. Conclusions: Although this study was based on a retrospective chart review of a small sample size, the newly proposed luminal subtypes including Corresponding author.
منابع مشابه
Association Between Oncotype DX Recurrence Score and Clinicopathological Variables in Breast Cancer Patients
Introduction: Breast cancer is the most common cancer and the leading cause of cancer-related death in women. Clinicopathological variables are important factors in deciding on breast cancer treatment. This study evaluated the association between the recurrence score generated by the Oncotype DX® 21-gene assay and classic clinicopathological variables. Methods: A single-institution retrospect...
متن کاملA Prospective Comparison of the 21-Gene Recurrence Score and the PAM50-Based Prosigna in Estrogen Receptor-Positive Early-Stage Breast Cancer
INTRODUCTION The 21-gene Recurrence Score(®) assay (Oncotype DX(®), Genomic Health, Inc.) is a validated predictor of recurrence risk/chemotherapy benefit in patients with estrogen receptor-positive (ER+) early-stage breast cancer treated with endocrine therapy. The Prosigna(®) assay (NanoString Technologies Inc.) is a validated prognosticator in postmenopausal patients with low-risk ER+ early-...
متن کاملRapid Health Technology Assessment of Oncotype DX in Patients with Early-Stage Breast Cancer
Introduction: Breast cancer is the most common cancer in women. Patients are treated with chemotherapy initially, and if not chemically treated, the risk of recurrence of the disease increases yearly. Therefore, methods for identifying patients for whom chemotherapy would be most beneficial are very important. The Oncotype DX test is a prognostic assay that predicts the likelihood of breast can...
متن کاملThe use of automated Ki67 analysis to predict Oncotype DX risk-of-recurrence categories in early-stage breast cancer
Ki67 is a commonly used marker of cancer cell proliferation, and has significant prognostic value in breast cancer. In spite of its clinical importance, assessment of Ki67 remains a challenge, as current manual scoring methods have high inter- and intra-user variability. A major reason for this variability is selection bias, in that different observers will score different regions of the same t...
متن کاملComparison between Oncotype DX test and standard prognostic criteria in estrogen receptor positive early-stage breast cancer Comparação entre o teste Oncotype DX e critérios prognósticos padronizados em câncer de mama receptor de estrogênio positivo em estágio inicial
Objective: To compare the prognosis estimated by standard prognostic criteria versus the prognosis estimated by the Oncotype DX. Methods: A retrospective study was performed on 22 patients with positive estrogen receptor, early-stage breast cancer who had an Oncotype DX recurrence score available. Results: Kappa value between Oncotype DX and standard prognostic criteria was: Adjuvant! (K = 0.09...
متن کامل