(in English): The subject of my dissertation is the decision of the subjects to participate in the early phase of clinical trial. The aim of this disseration is to detect and understand the ethical aspects of decision making of subjects with oncological diseases to participate in the early phase of clinical trial. In the theoretical part of my dissertation, I define the field of clinical research, describe the phases of clinical research and ethical codes important for clinical research. The current ethical dilemmas related to the participation of subjects in the early phase of clinical trial, which are being discussed by the professional public, are presented. The research part contains the results of interviews with seventeen respondents whose content correlates with the aim of the research part and it is to understand the decision- making of subjects to participate in the early phase of clinical trial in terms of subjectively constructed realities, which are different for individual respondents. The results of the research show that fourteen respondents identified one of the most important aspects of the decision-making to participate in the early phase of clinical trial of the recommendation of principal investigator and trust in a physician. Twelve respondents stated the most frequent reason...

(in English): The subject of my dissertation is the decision of the subjects to participate in the early phase of clinical trial. The aim of this disseration is to detect and understand the ethical aspects of decision making of subjects with oncological diseases to participate in the early phase of clinical trial. In the theoretical part of my dissertation, I define the field of clinical research, describe the phases of clinical research and ethical codes important for clinical research. The current ethical dilemmas related to the participation of subjects in the early phase of clinical trial, which are being discussed by the professional public, are presented. The research part contains the results of interviews with seventeen respondents whose content correlates with the aim of the research part and it is to understand the decision- making of subjects to participate in the early phase of clinical trial in terms of subjectively constructed realities, which are different for individual respondents. The results of the research show that fourteen respondents identified one of the most important aspects of the decision-making to participate in the early phase of clinical trial of the recommendation of principal investigator and trust in a physician. Twelve respondents stated the most frequent reason...