Defining undertreatment and overtreatment in older patients with cancer: A scoping review of the literature.

Abstract

e23020 Background: The terms “undertreatment” and “overtreatment” are often used to describe the management of older adults with cancer. The aim of this scoping review was to explore the explicit and implicit definitions associated with the use of these terms. Methods: We searched PubMed (NCBI), Embase (Elsevier), and CINAHL (EBSCO) for titles and abstracts that included the terms "undertreatment" or "overtreatment" (overtreat OR undertreat OR over treat OR under treat) of older adults with cancer. We included all types of articles, cancers, and treatments. We excluded studies that only included patients younger than 60 years old or studies without a defined focus on older adults. CD and KL independently reviewed a subset of included articles to assess for inter-reviewer reliability. Results: We identified 224 primary and secondary research articles that used the terms “undertreatment” (192), “overtreatment” (72), or both (45) regarding the management of older adults with cancer. Only 14 (6.3%) articles provided an explicit definition; for the remaining articles, we derived the implicit definitions from the terms’ surrounding context. There was substantial agreement between CD and KL in their interpretation of definitions of these terms (kappa 0.81). “Undertreatment” was commonly used to imply less than “standard” therapy (130 articles, 67.7%), or less than “standard” therapy that contributed to worse outcomes (62, 32.3%). Many articles did not account for the underrepresentation of older adults in trials leading to “standard” therapy, and 24 primary studies performed no or limited adjustment for geriatric domains (e.g., function) in their analyses that suggested worse survival in older adults treated with substandard therapy. “Overtreatment” was commonly used to imply cancer treatment in an older adult whose cancer would not have caused symptoms in his/her remaining lifetime (31, 43.1%), or aggressive treatment in whom the harms of treatment outweigh its benefits (41, 56.9%). Conclusions: Nearly all articles used the terms “undertreatment” and/or “overtreatment” without an explicit definition, and we identified variability and limitations in the meanings implied by these terms.