Abstract: 【Abstract】 Objective To compare the performance of the severity-of-illness score for toxic epidermal necrolysis （SCORTEN） and ABCD-10 （age, bicarbonate, cancer, dialysis, 10% body surface area） scoring systems in predicting death in patients with Stevens-Johnson syndrome （SJS）/toxic epidermal necrolysis （TEN）. Methods Clinical data were collected from 85 patients with SJS/TEN who were hospitalized in Sichuan Provincial People′s Hospital from January 2010 to April 2021, and retrospectively analyzed. The predicted mortality and actual mortality were compared at each score level of SCORTEN and ABCD-10. The receiver operating characteristic （ROC） curve and Hosmer-Lemeshow goodness-of-fit test were used to evaluate the predictive power and calibration of SCORTEN and ABCD-10 on mortality. Results Among the 85 patients, 37 were males and 48 were females, and their ages were 52.36 ± 19.31 years （range, 14 - 88 years）. There were 61 cases of SJS, 6 of SJS/TEN overlap, and 18 of TEN. Ten patients died in hospital and the fatality rate was 11.76%. Among the SCORTEN and ABCD-10 components, age > 40 years or ≥ 50 years, epidermal exfoliation > 10% body surface area on the 1st day after admission, heart rate > 120 beats per minute, serum urea nitrogen level > 10 mmol/L and serum bicarbonate level < 20 mmol/L were significantly correlated with death （χ2 = 4.46, 6.18, 25.50, 15.13, 7.59, 8.38, respectively, all P < 0.05）, while malignancies, serum glucose level > 14 mmol/L, and pre-hospital dialysis were not significantly correlated with death （χ2 = 0.35, 0.10, 1.38, respectively, all P > 0.05）. There were no significant differences between the predicted mortality and actual mortality at every score level of SCORTEN and ABCD-10 （all P > 0.05）. The ROC curve showed that both SCORTEN and ABCD-10 had good predictive power for death （areas under the curve: 0.874 and 0.867, 95% CI: 0.758 - 0.990, 0.773 - 0.962, respectively）, but the model goodness-of-fit of SCORTEN was superior to that of ABCD-10 （P = 0.944, 0.048, respectively）. Conclusion Both SCORTEN and ABCD-10 scoring systems could accurately predict mortality of SJS/TEN patients at early stage, but SCORTEN showed more favourable predictive power and calibration.

Key words: Epidermal necrolysis, toxic, Stevens-Johnson syndrome, Severity of illness index, Prognosis, Death, Severity-of-illness score for toxic epidermal necrolysis, ABCD-10