Imelda Coyne, Dónal P O'Mathúna, Faith Gibson, Linda Shields, Edith Leclercq, Greg Sheaf

This is an update of the Cochrane systematic review of shared decision-making (SMD) making published in 2013. Children's rights to have their views heard in matters that affect their lives are now well established since the publication of the UN Convention treaty (1989). Children with cancer generally prefer to be involved in decision-making and consider it important that they have the opportunity to take part in decision-making concerning their health care, even in end-of-life decisions. There is considerable support for involving children in healthcare decision-making at a level commensurate with their experience, age and abilities. Thus, healthcare professionals and parents need to know how they should involve children in decision-making and what interventions are most effective in promoting SDM for children with cancer. To examine the effects of SDM interventions on the process of SDM for children with cancer who are aged four to 18 years. We searched the following sources for the review: Cochrane Central Register of Controlled Studies (CENTRAL) (the Cochrane Library 2016, Issue 1); PubMed (NLM) (1946 to February 2016); Embase (Ovid) (1974 to February 2016); CINAHL (EBSCO) (1982 to February 2016); ERIC (ProQuest) (1966 to February 2016); PsycINFO (EBSCO) (1806 to February 2016); BIOSIS (Thomson Reuters) (1980 to December 2009 - subscription ceased at that date); ProQuest Dissertations and Theses (1637 to February 2016); and Sociological Abstracts (ProQuest) (1952 to February 2016). In addition we searched the reference lists of relevant articles and review articles and the following conference proceedings (2005 up to and including 2015): American Academy on Communication in Healthcare (AACH), European Society for Medical Oncology (ESMO), European CanCer Organisation (ECCO), European Association for Communication in Healthcare (EACH), International Conference on Communication in Healthcare (ICCH), International Shared Decision Making Conference (ISDM), Annual Conference of the International Society for Paediatric Oncology (SIOP) and Annual Scientific Meeting of the Society for Medical Decision Making (SMDM). We scanned the ISRCTN (International Standard Randomised Controlled Trial Number) register and the National Institutes of Health (NIH) Register for ongoing trials on 29 February 2016. For this update, we included randomised controlled trials (RCTs) and controlled clinical trials (CCTs) of SDM interventions for children with cancer aged four to 18 years. The types of decisions included were: treatment, health care and research participation decisions. The primary outcome was SDM as measured with any validated scale. Two review authors undertook the searches, and three review authors independently assessed the studies obtained. We contacted study authors for additional information. No studies met the inclusion criteria, and hence no analysis could be undertaken. No conclusions can be made on the effects of interventions to promote SDM for children with cancer aged four to 18 years. This review has highlighted the dearth of high-quality quantitative research on interventions to promote participation in SDM for children with cancer. There are many potential reasons for the lack of SDM intervention studies with children. Attitudes towards children's participation are slowly changing in society and such changes may take time to be translated or adopted in healthcare settings. The priority may be on developing interventions that promote children's participation in communication interactions since information-sharing is a prerequisite for SDM. Restricting this review to RCTs was a limitation and extending the review to non-randomised studies (NRS) may have produced more evidence. For this update, we included only RCTs and CCTs. Clearly more research is needed.