OBJECTIVE：To provide reference for the clinical treatment and pharmacoeconomics research of type 2 diabetes patients. METHODS ：Using“Discrete choice ”“Discrete ranking ”as Chinese keywords ，“Discrete choice ”“Discrete ranking ” “Conjoint analysis ”“Diabetes mellitus ”“Type 2”“Type 2 diabetes mellitus ”“Non-insulin-dependent diabetes mellitus ”as English keywords，Chinese and English literatures were retrieved from domestic and foreign databases as CNKI ，Wanfang database ， PubMed，Web of Science during the inception to Dec. 2019. The application status of discrete choice experiment （DCE）was analyzed and summarized from the aspect of attributes and levels ，DCE choice sets ，DCE data quality ，sample size ，econometrics analysis and the preference results. RESULTS & CONCLUSIONS ：A total of 295 related literatures were retrieved ，involving 30 valid literatures. The attributes as drug administration ，glucose control and hypoglycemic events were included more frequently. D-efficient/ D-optimal and orthogonal experiment designs were used more frequently to create the DCE choice sets. DCE data quality could be checked by the internal validity tests. The rules of thumb was usually used to calculate the sample size. Conditional Logit model ，multinomial Logit model or mixed Logit model were used more frequently to analyze the preference data. ZH187） Compared with mild hypoglycemic events ，patients’treatment E-mail：19111020032@fudan.edu.cn choices were more likely to be affected by blood glucose control. However ， when hypoglycemic events occurred at：yychen@shmu.edu.cn night or the degree of hypoglycemia was serious ， the ·treatment preference of patients would change. Although most studies included the drug administration related attributes ，they were not major factors influencing patients ’treatment preferences and were closely related to patients ’previous medication history. DCE had been widely used in the study of type 2 diabetes in foreign countries ，but there were few relevant studies in China. The data quality of DCE was difficult to control. Although the trend of building complex econometric models was gradually rising ，most studies had not fully introduced the design details such as sample size determination method ，option set design principle and quality control option. In addition ，there were some deficiencies such as too many attributes ，too large or too small horizontal spacing. It is suggested that the ten criteria of related research in ISPOR report by Bridges JF and other soholars can be used for reference in DCE design to improve the rigor of design and ensure the credibility of preference results.

This experiment was designed to study the apoptosis and related mechanism of adherent liver tumor cells (SMMC-7721) and adherent normal liver cells (HL-7702) when they were exposed to the steep pulse generated by the steep pulse apparatus for tumor treatment. The results showed that the steep pulse of 200 V could induce tumor cells apoptosis. The tumor cells presented with their apoptosis when they were exposed to the steep pulse from 200 V to 250 V. Laser scanning confocal microscopy was used to make a real time study of calcium burst when the adherent tumor cells were exposed to the steep pulse. The results showed:On the condition of no extracellular Ca2+, the concentration of Ca2+ in tumor cells exposed to the steep pulse of 150 V did not change; the concentration of Ca2+ in tumor cells exposed to the steep pulse of 200 V decreased; the concentration of Ca2+ in tumor cells exposed to the steep pulse of 250 V decreased more evidently. On the condition of existing extracellular Ca2+, the concentration of Ca2+ in tumor cells exposed to the steep pulse of 150 V did not change; the concentration of Ca2+ in tumor cells exposed to the steep pulse of 200 V decreased little; the concentration of Ca2+ in tumor cells exposed to the steep pulse of 250 V reduced little, too. Maybe the change of calcium burst in the tumor cells is the mechanism of apoptosis when cells are exposed to the steep pulse.
Apoptosis ; radiation effects ; Calcium ; metabolism ; Electricity ; Electromagnetic Fields ; Hepatocytes ; cytology ; pathology ; Humans ; Liver Neoplasms ; metabolism ; pathology ; Microscopy, Confocal ; Tumor Cells, Cultured