Loneliness in older adults living with cancer: A scoping review of the quantitative and qualitative evidence on behalf of the International Society of Geriatric Oncology Nursing and Allied Health Interest Group

Introduction: Loneliness is common in older adults. Cancer and its treatments can heighten loneliness and result in poor outcomes. However, little is known about loneliness in older adults with cancer. Our objective was to provide an overview of the prevalence of loneliness, contributing factors, evolution during the cancer trajectory, impact on treatment, and interventions to reduce loneliness. Materials and Methods: We conducted a scoping review including studies on loneliness in adults with cancer aged >65. Original, published studies of any designs (excluding case reports) were included. A two-step screening process was performed. Results: Out of 8,720 references, 19 studies (11 quantitative, 6 qualitative, 2 mixed-methods), mostly from the United States, Netherlands, and/or Belgium, and most published from 2010, were included. Loneliness was assessed by the De Jong Gierveld Loneliness Scale, and the UCLA loneliness scale. Up to 50% of older adults felt lonely. Depression and anxiety were often correlated with loneliness. Loneliness may increase over the first 6-12 months during treatment. One study assessed the feasibility of an intervention aiming at reducing primarily depression and anxiety and secondarily, loneliness in patients with cancer aged >70 after five 45-min sessions with a mental health professional. No studies investigated the impact of loneliness on cancer care and health outcomes.