Résumé : Background: No study has yet assessed the impact of physicians' skills acquisition after a communication skills training program on changes in patients' and relatives' anxiety following a three-person medical consultation. This study aimed at comparing, in a randomized study, the impact, on patients' and relatives' anxiety, of a basic communication skills training program and the same program consolidated by consolidation workshops and at investigating physicians' communication variables associated with patients' and relatives' anxiety.Methods: Consultations with a cancer patient and a relative were recorded and analyzed by the Cancer Research Campaign Workshop Evaluation Manual. Patients' and relatives' anxiety were assessed with the State-Trait Anxiety Inventory—State.Results: No statistically significant change over time and between groups was observed. Mixed-effects modeling of changes in patients' and relatives' anxiety showed that decreases in both patients' and relatives' anxiety were linked with patients' and relatives' self-reported distress (p = 0.031 and 0.005), and that increases in both patients' and relatives' anxiety were linked with physicians' breaking bad news (p = 0.028 and 0.005).Conclusion: No impact of the training program was observed. Results indicate the need to further study communication skills which may help reduce patients' and relatives' anxiety especially when breaking bad news. Copyright © 2007 John Wiley & Sons, Ltd.