IntroductionGuidelines are important tools for supporting quality management in the care of patients with cancer. However, in clinical practice barriers exist to their implementation. Consequently, Quincie aims at: (1) gaining a comprehensive picture of the implementation of quality indicators from the national guideline on palliative care for patients with incurable cancer in palliative care units and (2) describing the factors that facilitate and hinder their implementation to develop recommendations.Methods and analysisThe Quincie study follows a mixed-methods approach across two study phases. In phase 1, routinely collected data of 845 patients with incurable cancer from eight palliative care units in the commuting area of the Comprehensive Cancer Centre Lower Saxony will be analysed, regarding the implementation of 10 quality indicators from the national guideline on palliative care. Structural characteristics of the palliative care units will also be collected. In phase 2, recommendations for the practical implementation of the quality indicators, focusing on the achievement of the quality objectives identified in phase 1, will be developed in an implementation workshop. These recommendations will be subsequently agreed on via a Delphi survey.Ethics and disseminationEthical approval has been given by the ethics committee of the Hannover Medical School (first vote, No. 10567_BO_K_2022) and other relevant institutions. The results will provide urgently needed insights on the implementation of the national guideline on palliative care in clinical care and on the factors that facilitate and hinder this implementation. The results are expected to promote better care for patients with incurable cancer. The results will be directly reported to the participating palliative care units and will be published in relevant peer-reviewed journals. They will also be presented at national conferences.Trial registration numberGerman Clinical Trials Register (DRKS00029965).