Abstract
e12050 Background: There is emerging evidence that a 21 gene expression assay recurrence score (RS) is prognostic independent of age. In practice, pathological markers may influence decision to recommend adjuvant chemotherapy. Methods: The primary objective of this study is to investigate the relationship between the RS and pathological markers between younger (29-49) and older (50-79) women with early stage ER+ breast cancer. Pathological markers investigated included the progesterone receptor (PR), grade, Ki-67, and P53. Patients who underwent 21 gene assay testing between 2002 through 2012 were sequantially identified. Data was extracted via the institutional tumor registry or chart reviewing. For each pathological feature, mean RS was compared between younger and older patients by t-tests. Trends in chemotherapy recommendation were assessed between younger and older patients within each RS risk category (≤10, 11-25, ≥26). Results: Between 2002 and 2012, 344 eligible patients were identified. 133 were ≤49 years of age, and 211 ≥50. There was no difference in distribution of RS across age (R2=3x10-4). Between younger and older patients, there was no difference in mean RS for any pathological marker (table 1). Within each age group, mean RS was always higher in tumors that were PR negative, grade 2/3, Ki67 >10%, and P53 ≥10% (p<0.05, respectively). In patients with a RS ≤10, 0% were recommended adjuvant chemotherapy irrespective of age. In patients with a RS 11-25, 39% of younger and 40% of older women were recommended chemotherapy. In patients with a RS ≥26, 100% of younger and 98% of older women were recommended chemotherapy. Conclusions: The relationships between pathological features and RS are consistent across age, supporting observations that the RS can predict benefit irrespective of age. See table. [Table: see text]
Published Version
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