Background
Chemotherapy is less often prescribed in older individuals due to concerns about post-treatment morbidity and quality of life. We evaluated the physical performance of breast cancer survivors treated with and without adjuvant chemotherapy.
Methods
We conducted a case-control study in 56 estrogen receptor positive breast cancer survivors (BCS) on adjuvant aromatase inhibitors 1-2 years after definitive surgery. Cases had received adjuvant chemotherapy (n = 27; age 70.5±3.6 yrs) versus age-matched controls who had not (n = 29; age 70.0±4.3 yrs). Measures of grip strength, physical activity and performance, walking speed, fatigue, and self-reported physical function were collected. Biological correlates of inflammation, frailty and markers of DNA and RNA oxidation were compared.
Results
Grip strength (Controls: 21±7.4 vs. Cases: 29.7±5.0 kg, p=0.20), physical activity (5403±3204 vs. 6801±9320 steps/day, p=0.45), physical performance (Short Physical Performance Battery score: 10.1±1.8 vs. 10.4±1.1, p=0.52), long-distance walking speed (1.2±0.21 vs. 1.3±0.41 m/sec, p=0.17) were similar between the two groups. Self-reported physical function was marginally lower in cases than controls (Controls: 72±24 vs. Cases: 57±34 AU, p=0.07). Fatigue disruptiveness was not different between groups (Controls: 11.1±13.0 vs. Cases: 15.7±16.2 AUs, p=0.24). Similarly, the inflammation, oxidation, and frailty markers did not present a significant difference between groups, except for vitamin D levels (p=0.04).
Conclusion
Older women who received chemotherapy reported having slightly lower physical function, but a similar physical performance compared to women who did not. These data suggest that older BCS treated with chemotherapy recover to an extent similar to survivors who only received hormonal therapy.