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Breast cancer (BC) incidence increases with age; however, there is still a paucity of data on cancer biology, standardized
treatment, and outcomes in elderly (≥70 y/o) patients. We evaluated whether ER/PR/HER2 subtype and TNM stage of
invasive BC had significant impact on overall survival (OS) in a study population of 232 elderly Caucasian female patients (≥70
y/o) from our institution at the 10 year interval (01/1998-7/2008), and analyzed treatments that they received (last follow-up
date 8/1/2013). Patients were grouped according to TNM stage and ER/PR/HER2 subtype using 5-group classification system
per 2011 St. Gallen International Consensus Panel recommendations. OS was measured comparing these categories using
Kaplan Meier curves and Cox regression analysis. The majority of patients (178/232=76.7%) were in the traditionally considered
“favorable” BC subtype (ER+/PR+/HER2-); 23.3% were in “unfavorable” subtype [HER2+=12% (28/232) and triple negative
(TNP) =11.3% (26/232)]. Interestingly, a trend for better survival was noted in HER2+ patients, the group that is only nowadays
considered worth reclassifying to “favorable” due to advantageous effects of anti-HER2 treatment (HER2+ OS=68%; ER+/PR+/
HER2- OS=56% and TNP OS=58%). However, no ER/PR/HER2 subtype was significantly predictive of better OS (p=.73). TNM
stage was predictive of OS (p<0.001). Our previously published data on non-significant effects of ER/PR/HER2 on OS in our
Caucasian BC patient population are concordanttoresults obtained in our elderly patient subgroup. Discussion of this abstract
will include the treatments that our patients received and compare/contrast them to the literature data in an attempt to reconcile
and stratify given therapy with outcomes.
Matthew Curzon received a BSc degree in Physiological Science from the University of California, Los Angeles in 2008 and his Medical degree from the American University of the Caribbean in 2012. Currently, he is a Chief Resident and a PGY-3 resident in Anatomic and Clinical Pathology Residency Program at the University of Tennessee Medical Center in Knoxville, Tennessee. He has research interest in breast cancer, biomarkers and improving patient outcomes.
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