Cancer is one of the leading causes of death worldwide and a cancer death is a major risk factor for pathological bereavement. This systematic review of the literature aimed to identify biopsychosocial and existential determinants specific to the palliative phase of cancer that influence the grieving experience of the caregiving relative. A systematic review of the literature was conducted without language or time restrictions. The Cairn, Cochrane Library, PubMed, PsycArticle, PsychInfo, Psychology and Behavioral Sciences Collection databases were explored. All studies assessing pre- and post-death measures and focusing on friends and relatives caring for adults with cancer in palliative care services were included in the review. Out of 645 articles identified, 18 full text studies were finally included in our systematic review of the literature. Many factors specific to the cancer palliative phase were identified as influencing the bereavement experience of caregivers, with factors relating to: 1) the caregiver (e.g. social support, psychological burden, preparation for loss, action and discussion related to death); 2) the patient (e.g. denial or acceptance); 3) the interactions between patient and their caregivers (e.g. tensions, communication difficulties, and presence at the time of death); and 4) the end-of-life context. The caregiver's grief experience can be described by the following terms: typical and pathological grief, anxiety, depression, guilt, psychological distress, post-traumatic stress disorder and post-traumatic growth, and life satisfaction.  Many contextual, sociodemographic, dispositional and transactional factors specific to the palliative cancer phase are involved in the caregiver's grieving experience. Avenues for reflection and recommendations are proposed including supporting communication and patient-relative relationships, evaluating the nature and degree of functionality of coping strategies, strengthening the robustness of methodologies, considering impact of COVID-19, and new lines of enquiry for research.< Réduire