The update was undertaken by the European Palliative Care Research Collaborative (EPCRC). The new guidelines were published in Lancet Oncology this month, and a podcast with a discussion of the guidelines is currently available at the homepage of Lancet Oncology.
The supporting evidence for the updated opioid guidelines consists of 17 systematic reviews that were published in a special issue of Palliative Medicine in July 2011.
A patient friendly summary of the guidelines can be downloaded from the EPCRC website.
European Palliative Care Research Collaborative: Website, accessed 8 February 2012