Clinical Features of Stevens-Johnson Syndrome and Toxic Epidermal Necrolysis Induced by Immune Checkpoint Inhibitor versus Non-Immune Checkpoint Inhibitor Drugs in China: A Cross-Sectional Study and Literature Review.

Purpose: Immune checkpoint inhibitors (ICIs) can cause life-threatening Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN). Large-scale original research on ICI-induced SJS/TEN is limited. This study aimed to explore the unique clinical characteristics and potential pathophysiological mechanisms of SJS/TEN induced by ICIs. Methods: This cross-sectional study compared the clinical features of SJS/TEN induced by ICIs and non-ICIs, and reviewed the case characteristics of ICI-induced SJS/TEN. Clinical features were analyzed using independent t-tests, Mann-Whitney Results: This study enrolled 41 cases of ICI-induced SJS/TEN and 107 non-ICI-induced cases from January 22, 2015, to May 28, 2024. ICI-induced SJS/TEN patients exhibited a trend towards a longer latency period (β: 17, 95% CI: -1.49 to 35.48), a smaller affected body surface area (BSA) (β: -40.68, 95% CI: -71.59 to -9.77), and milder oral and ocular mucositis than non-ICI-induced cases. A literature review identified PD-1 inhibitors as the primary ICIs involved and systemic corticosteroids as the most frequent intervention. No statistically significant difference in mortality rate was observed between patients treated with systemic corticosteroids alone and those receiving combination therapies (P= 0.85). The mortality rate for ICI-induced SJS/TEN was 24.5%. Conclusion: This study offered the largest comparative analysis to date, highlighting the unique clinical features of ICI-induced SJS/TEN, including a smaller affected BSA, a prolonged latency period trend, and milder oral and ocular mucositis. We described the epidemiology, clinical presentation, and therapeutic strategies for ICI-induced SJS/TEN. These findings not only contribute to a deeper understanding of the complex immune-inflammatory pathways in severe immune-related cutaneous adverse events (ircAEs) but also may inform the development of more targeted and effective treatments.