While the importance of individualized and comprehensive care, taking into account the bio-psychosocial characteristics of the patient, has been demonstrated, this remains a considerable challenge in daily clinical practise. The Swiss Cancer League promotes since many years so called Communication Skills Training (CST). Different studies have demonstrated a positive impact of CST, illustrating that communicational competence is not only a consequence of a personal and professional development, but can be modified by an intensive and interactive training. A new scientific approach aims to elucidate the underlying mechanisms of communicational improvements, based on the hypothesis that CTS modify participants' defence mechanisms