Functional Decline in the Cancer Patient: A Review

Simple Summary Older patients with cancer are more likely to experience a deterioration in their functional status than are their similar-aged, cancer-free counterparts. Such functional decline can be accelerated by cancer treatment. With adequate long-term care comprising routine functional assessment and evidence-based interventions, functional status is likely to be maintained, or the rate of decline slowed. Mitigating the risk of functional decline is vital given its impact on quality of life and mortality. A decline in functional status, an individual's ability to perform the normal activities required to maintain adequate health and meet basic needs, is part of normal ageing. Functional decline, however, appears to be accelerated in older patients with cancer. Such decline can occur as a result of a cancer itself, cancer treatment-related factors, or a combination of the two. The accelerated decline in function seen in older patients with cancer can be slowed, or even partly mitigated through routine assessments of functional status and timely interventions where appropriate. This is particularly important given the link between functional decline and impaired quality of life, increased mortality, comorbidity burden, and carer dependency. However, a routine assessment of and the use of interventions for functional decline do not typically feature in the long-term care of cancer survivors. This review outlines the link between cancer and subsequent functional decline, as well as potential underlying mechanisms, the tools that can be used to assess functional status, and strategies for its prevention and management in older patients with cancer.