Abstract 3411: Health-related quality of life trajectories in older breast cancer survivors and noncancerous controls over ten years: SEER-MHOS analysis
Authors: Lee Eunkyung , Daruge Maria Azevedo , Ferdowsi Katia , Zhu Jianbin 
Published: March 2024

Abstract
Background: The adverse effects of cancer treatment on health-related quality of life (HRQOL) are the primary concern of older women diagnosed with breast cancer. The interplay of transient and progressive functional impairments caused by cancer therapies alongside the accelerated physical declines associated with the normal aging process are all negatively correlated to HRQL, yet it remains unclear whether this is an effect of cancer or solely aging; therefore, this study examined HRQL trajectory over ten years after diagnosis between cancer cases and controls.
Methods: The cancer group included 1467 women (age ≥ 65) diagnosed with primary breast cancer in 1998 - 2012, registered in the Surveillance, Epidemiology, End Results (SEER) cancer registry, and completed Medical Health Outcomes (MHO) surveys before and after cancer diagnosis. Propensity score-matched controls were randomly selected with a 1:1 ratio. Participants reported their HRQOL using SF-36/VR-12. It was summarized into two summary scores (Physical Component Summary [PCS] and mental component summary [MCS]) and eight domain scores (physical functioning [PF], role limitation due to physical health [RP], bodily pain [BP], general health [GH], vitality [VT], social functioning [SF], mental health [MH], and role limitation due to emotional problem [RE]). Hierarchical linear modeling was utilized to assess the main effects of time and group and the interaction effect between time and group on HRQOL trajectory.
Results: At diagnosis, cases fared worse than controls for all HRQOL domains and summary scores. Over the ten years, PCS, PF, GH, RP, SF, and VT worsened over time (all P for time &lt; 0.05), while MCS, MH, and RE remained relatively constant over time (all P for time ≥ 0.05). Older women with breast cancer had lower HRQL over time than controls in PCS, GH, and RP domains, while they showed higher HRQOL than controls post 4 - 7 years in PF, SF, RE, and VT domains (all P for group &lt; 0.05). However, only RE showed a statistically significant interaction effect (P =0.035), improving over time in cases but worsening in controls.
Conclusions: This research shows both older women with breast cancer and propensity-matched controls experiencing deterioration of HRQOL, particularly physical health domains, over ten years after baseline, with cases’ HRQOL kept lower than controls over time. Needs assessment and more efficient interventions to improve physical health HRQOL among older women are warranted.
Citation Format: Eunkyung Lee, Maria Azevedo Daruge, Katia Ferdowsi, Jianbin Zhu. Health-related quality of life trajectories in older breast cancer survivors and noncancerous controls over ten years: SEER-MHOS analysis [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2024; Part 1 (Regular Abstracts); 2024 Apr 5-10; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2024;84(6_Suppl):Abstract nr 3411.