• Richard Harding, Sally List, Eleni Epiphaniou, and Hannah Jones.
• King's College London, School of Medicine, Cicely Saunders Institute, Department of Palliative Care, Policy and Rehabilitation, London, UK. richard.harding@kcl.ac.uk
• Palliat Med. 2012 Jan 1; 26 (1): 7-22.

IntroductionInformal caregivers needs in cancer/advanced disease are largely unmet. The science of carer intervention evaluation is methodologically challenging, and the evidence historically weak.ObjectiveThis systematic review updates an earlier effectiveness review to determine both the effectiveness of subsequently published intervention studies, and the current state of science.MethodThe evidence was identified and appraised using a comprehensive search strategy. Articles were searched from 2001 to 2010 using the following electronic databases: Medline, PsychINFO and CINAHL. Inclusion criteria were studies reporting intervention data for informal adult caregivers of a patient with a diagnosis of cancer or receiving palliative care. The design and evidence rigour were assessed using the Jadad Rating Scale, and the Quality Rating Scale.Results33 studies met inclusion criteria. From the original review, an encouraging increase was identified in the number of evaluations (from 8 to 33), in carer-specific interventions (from 6 to 17) and in the robustness of the study design (an increase from 2 to 12 studies with before/after measures, comparison groups and prospective data).ConclusionsThe evidence suggests a rapid increase in the number of robust intervention studies. However, the range of models remains narrow in relation to caregivers' needs and preferences.

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