ABSTRACT
INTRODUCTION: Treatment decision-making in cancer is complex and many patients bring their caregiver to appointments to help them make those decisions. Multiple studies show the importance of involving caregivers in the treatment decision-making process. We aimed to explore the preferred and actual involvement of caregivers in the decision-making process of patients with cancer and to see if there are age or cultural background related differences in caregiver involvement. MATERIALS AND METHODS: A systematic review of Pubmed and Embase was performed on January 2, 2022. Studies containing numerical data regarding caregiver involvement were included, as were studies describing the agreement between patients and caregivers regarding treatment decisions. Studies assessing solely patients aged younger than 18 years old or terminally ill patients, and studies without extractable data were excluded. Risk of bias was assessed by two independent reviewers using an adapted version of the Newcastle-Ottawa scale. Results were analysed in two separate age groups, one <62 years and one ≥62 years. RESULTS: Twenty-two studies with a total of 11,986 patients and 6,260 caregivers were included in this review. A median of 75% of patients preferred caregivers to be involved in decision-making and a median of 85% of caregivers preferred to be involved. With regards to age groups, the preferred involvement of caregivers was more frequent in the younger study populations. With regards to geographical differences, studies performed in Western countries showed a lower preference for caregiver's involvement compared to studies from Asian countries. A median of 72% of the patients reported the caregiver was actually involved in the treatment decision-making and a median of 78% of the caregivers reported they were actually involved. The most important role of caregivers was to listen and provide emotional support. DISCUSSION: Patients and caregivers both want caregivers to be involved in the treatment decision-making process and most caregivers are actually involved. An ongoing dialogue between clinicians, patients and caregivers about decision-making is important to meet the individual patient's and caregiver's needs when involved in the decision-making process. Important limitations were a lack of studies in older patients and significant differences in outcome measures among studies.
