Kim JS, Jang JH, Jo DY, Ahn SY, Yoon SS, Lee JH, Kim SH, Choi CW, Shin HJ, Kim MK, Lee JH, Mun YC, Kong JH, Hyun B, Nam H, Kim E, Kwak MJ, Won YK, and Lee JW
Background: Paroxysmal nocturnal hemoglobinuria (PNH) is a rare hematologic disorder characterized by uncontrolled terminal complement activation. Eculizumab, a monoclonal antibody C5 inhibitor was introduced in Korea in 2009 and has been the standard treatment option for PNH., Methods: This study assessed the long-term efficacy/safety of eculizumab in PNH using real-world data from the Korean Health Insurance Review and Assessment Service. Eighty patients who initiated eculizumab from 2009-2020 were enrolled., Results: At eculizumab initiation, the median age was 51.5 years, lactate dehydrogenase (LDH) 6.8 × upper limit of normal, and granulocyte clone size 93.0%. All patients had at least one PNH-related complication before eculizumab initiation, including renal failure (n = 36), smooth muscle spasm (n = 24), thromboembolism (n = 20), and pulmonary hypertension (n = 15). The median (range) duration of eculizumab treatment was 52.7 (1.0, 127.3) months (338.6 total treated patient-years). Despite high disease activity in the study population before treatment initiation, overall survival was 96.2% and LDH levels were stabilized in most patients during treatment. PNH-related complications at treatment initiation were resolved in 44.4% of patients with renal failure, 95.8% with smooth muscle spasm, 70.0% with thromboembolism, and 26.7% with pulmonary hypertension. Extravascular hemolysis occurred in 28.8% of patients (n = 23; 0.09 per patient-year) and breakthrough hemolysis in 18.8% (n = 15; 0.06 per patient-year). No treatment discontinuation cases related to eculizumab were observed., Conclusion: These data provided evidence for the long-term efficacy and safety of eculizumab in Korean PNH patients with high disease burdens., Competing Interests: Jin Seok Kim has received honoraria and consulting fees from Handok Inc. Jun Ho Jang has received research support from Alexion, AstraZeneca Rare Disease. Sung-Soo Yoon has received research funding from Chong Kun Dang Pharm, JW Pharmaceutical, Kyowa Kirin, Roche-Genentech, and Yuhan Pharmaceutical; has served on the advisory board for Amgen, Antengene, Astellas, Celgene, Janssen, Merck, Novartis, and Takeda; and has received consulting fees from Ticaros Therapeutics. BokJin Hyun, HyunSun Nam, and Eunhye Kim are employees of Handok Inc. Min Joo Kwak and Yong Kyun Won were an employee of Handok Inc. at the time of study. Jong Wook Lee has served on advisory boards and has received honoraria and research grants from Alexion, AstraZeneca Rare Disease. Deog-Yeon Jo, Seo-Yeon Ahn, Je-Hwan Lee, Sung-Hyun Kim, Chul Won Choi, Ho-Jin Shin, Min-Kyoung Kim, Jae Hoon Lee, Yeung-Chul Mun, and Jee Hyun Kong have no potential conflicts of interest to disclose., (© 2023 The Korean Academy of Medical Sciences.)