Does a treatment delay affect the survival of octogenarian patient population?

Abstract

149 Background: The cancer management of the elderly patient is an increasingly important and challenging issue. The aim of this retrospective analysis is to evaluate the impact of treatment delay on survival outcome of cancer in octogenarian patients. Methods: From 2006 to 2015, established cancer patients age 80 and above who received treatment at our comprehensive cancer center were retrospectively reviewed. We evaluated the relationship between a delay in cancer treatment of more than 30 days in the octogenarian patient and survival using Kaplan-Meier survival and Cox proportional hazards models. Results: There were 235 octogenarian cancer patients available for evaluation and 115 of these had a delay in initiation of cancer treatment ( > 30 days). Mean age was 83.7 years the treatment delay (TD) group and 83.9 in the no treatment delay (NTD) group (p = 0.70) Eastern Cooperative Oncology Group (ECOG) score of 2 or more was present in 22.6% of the TD group and 18.3% of the NTD group (p = 0.42). Metastatic disease was higher in the NTD group (22.5% vs. 11.3% TD group; p = 0.051). There were more breast (36.5% TD vs. 12.5% NTD group) and lung cancer (26.9% TD vs. 18.3% NTD group) in the TD group, and more genitourinary (20.8% NTD vs. 9.6% TD group) and gynecological cancer (20.8% NTD vs. 15.6% TD group) in the NTD group (p < 0.001 for overall comparison). Median overall survival was higher in the TD group (50 vs. 24 months NTD group; p = 0.001). Treatment delay was still associated with improved survival even after adjusting for age, gender, ECOG, stage of disease, and type of tumor (HR 0.64, CI 0.44-0.92). Conclusions: We found that a delay in cancer treatment in the octogenarian patient was associated with better overall survivial. Bias in regards to the reasons for the treatment delay may exist and could have affected our results. We attempted to minimize this bias by adjusting for characteristics that influence treatment between our two study groups. Nevertheless, our findings suggest that a delay in cancer treatment at minimum did not adversely affect mortality in this older patient population.