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Frailty Index, Not Age, Predicts Treatment Outcomes and Adverse Events for Older Adults with Cancer

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Abstract

Background

Frailty is an indicator of individual vulnerability and differentiates health status among people of the same chronological age.

Objectives

This study aimed to determine whether baseline frailty index (FI) was associated with systemic anticancer therapy treatment outcomes in older adults with solid cancers.

Design

Retrospective cohort study.

Setting

Major metropolitan outpatient oncology service.

Participants

Adults aged over 65 years with a solid malignancy who had been referred for consideration of systemic therapy, and had completed a baseline frailty assessment between January 2019 and July 2021.

Measurements

Frailty had been prospectively assessed with a 58-item FI derived from a geriatric oncology nurse assessment prior to initial oncologist appointments. Primary outcome was treatment completion, and secondary outcomes included incidence of high-grade treatment-related toxicity or unplanned hospital admissions, and survival outcomes. Univariate and multivariable regression analyses were conducted to test the association between treatment outcomes and baseline FI. Co-variates included age, sex, performance status, treatment intent, and stage. Kaplan-Meier and cox proportional hazard analysis were conducted for survival analysis.

Results

The median FI (IQR) was 0.24 (0.15–0.31) and 43% were frail (FI>0.25). FI was positively correlated with ECOG, however 28% of ECOG 0–1 were frail. In multivariable regression analyses, each 0.10 increase in FI was associated with an increased likelihood of not completing or not receiving treatment (OR 1.37, 95% CI 1.02–1.84; p=.04), treatment-related toxicity (OR 1.60, 95% CI 1.14–2.23; p<.01) and unplanned hospital admissions (OR 1.61; 95% CI 1.16–2.25; p<.01). Frail patients had increased mortality (adjusted HR 2.81, 95% CI 1.42–5.56; p<.01). Age did not predict treatment completion, toxicities, or survival.

Conclusion

Baseline FI is a granular measure that can help to identify frailer older patients who are more likely to require tailored therapy and support, and less frail older patients who are more likely to tolerate treatment.

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Availability of data: Data available from corresponding author on reasonable request with approval from data custodian at Princess Alexandra Hospital.

Abbreviations

FI:

Frailty index

ECOG:

Eastern Cooperative Oncology Group

PS:

Performance status.

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Funding

Funding: The researchers also acknowledge the inkind funding and support provided by Division of Cancer Services, Princess Alexandra Hospital to conduct this research.

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Authors and Affiliations

Authors

Contributions

Author contributions: Study concepts: Fletcher J, Reid N, Hubbard RE, Berry R, Weston M, Walpole E, Ladwa R. Study design: Fletcher J, Reid N, Hubbard RE, Ladwa R. Data acquisition: Fletcher J, Berry R. Quality control of data and algorithms: Fletcher J. Data analysis and interpretation: Fletcher J, Reid N, Hubbard RE, Thaker DA, Ladwa R. Statistical analysis: Fletcher J, Reid N. Manuscript preparation: Fletcher J. Manuscript editing: Fletcher J, Reid N, Hubbard RE, Thaker DA, Ladwa R. Manuscript review: Fletcher J, Reid N, Hubbard RE, Berry R, Weston M, Walpole E, Kimberley R, Thaker DA, Ladwa R. All authors read and approved the final manuscript.

Corresponding author

Correspondence to J. Fletcher.

Ethics declarations

Conflicts of interest: The authors declare that they have no conflicts of interest.

Ethics approval: This study received ethics approval from local institution human research and ethics committee (HREC/2021/QMS/77072 (Sep ver 2)).

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Consent for publication: All authors have seen and approved the final manuscript, and agree to its submission to the Journal of Frailty & Aging.

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Fletcher, J., Reid, N., Hubbard, R.E. et al. Frailty Index, Not Age, Predicts Treatment Outcomes and Adverse Events for Older Adults with Cancer. J Frailty Aging (2024). https://doi.org/10.14283/jfa.2024.22

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