It is my great pleasure to apply advaced statistical model in the area of clinical trial using the standard questionaire developed by European Organization for Research and Treatment for cancer (EORTC) which is called as QLQ C-30 questionaire. And I recommend the EORTC members or editors to read my paper as it is the only paper conducted by applying advanced statistical models like factor and principal component Analyses. And it is also very important to Statistics lecturers as it is the application of statistics in health science in general. The only way to talk about any numerical or qualitative information is to learn STATISTICS.