e21526 Background: The probability of dying from breast cancer increases from 0.2% to 2% annually for women once they reach 70 years of age. However there is limited age-related information available about tumor biologic characteristics (TBCs) and clinical outcomes among elderly patients (pts). The purpose of this study was to analyze the impact of TBCs on clinical outcomes in a single institution's geriatric breast cancer pts. Methods: An institutional database of a total of 269 patients with histologically confirmed invasive or in-situ breast cancer with age 65 years or older at the time of diagnosis was reviewed in an IRB approved fashion. Tumors were assessed for Nottingham grade, stage, ER/PR status, HER-2 status, tumor histology, lymphovascular invasion and nodal status. Kaplan-Meyer and Cox proportional hazards methods were used to calculate overall survival (OS). Results: Breast cancer was seen equally in both breasts: left n = 130 (48.3%), right n = 132 (49.1%). Most tumors were located in the upper outer quadrant (n = 122, 45.35%). TNM clinical stage Tlc was identified in 79 pts (29.36%), Tlb in 55 pts (20.44%), T2 in 54 pts (20.07%) and no nodal involvement in 146 pts (54.27%). Nottingham Grade 2 (n = 120, 44.60%) and invasive ductal carcinomas (n = 152, 56.50%) were diagnosed most often. Tumors were more frequently ER+ (n = 237, 88.10%), PR+ (n = 210, 78.06%), and HER2-negative (n = 219, 81.41%). There was no statistically significant increase in OS based on location of tumor (P = 0.9796) and tumor histology (invasive ductal vs invasive lobular cancers, P = 0.1143). Node negative breast cancers were associated with increased OS (P = 0.0014). Grade 2 tumors were associated with increased OS compared to Grade 3 tumors (P = 0.0112). ER+ and PR-negative tumors were associated with decreased OS in both short term and long term follow up (P = 0.0083 & P = 0.0254). Conclusions: In pts 65 years of age or older with newly diagnosed breast cancer, lack of nodal involvement is associated with increased OS. Prognosis for ER+ and PR-negative tumors is worse compared to ER+ and PR+ tumors. Nottingham Grade 2 tumors have better OS compared to Grade 3 tumors. Location of tumor and tumor histology are not associated with increased OS.