Article
作者: Peixoto, Antonio ; Cassier, Philippe Alexandre ; Liu, Ting ; Mücke, Merlind ; Deva, Sanjeev ; Guidi, Micol ; Kraus, Dominik ; Moreno, Victor ; Klein, Christian ; Cervantes, Andrés ; Heichinger, Christian ; Higgins, Brian ; Tran, Vu-Long ; Michielin, Francesca ; Codarri Deak, Laura ; Gambardella, Valentina ; Schmid, Daniela ; Kim, Tae Min ; Lauener, Laura ; Kim, Hye Ryun ; Seeber, Stefan ; Blumenschein, George R ; Italiano, Antoine ; Kao, Henry ; Markert, Christoph ; Greillier, Laurent ; Løvendahl Eefsen, Rikke ; McIntyre, Christine ; Melero, Ignacio ; Perro, Mario ; F Sanmamed, Miguel ; Lee, Dae Ho ; Umaña, Pablo ; Weber, Patrick ; Hiret, Sandrine ; Rohrberg, Kristoffer Staal ; Garrido, Pilar ; Henick, Brian S ; Muñoz-Couselo, Eva
Background:This first-in-human clinical study explored lomvastomig, an immunoglobulin G1-based Fc-silenced bispecific antibody that simultaneously blocks the immune checkpoint receptors programmed cell death protein 1 (PD-1) and T-cell immunoglobulin domain and mucin domain-3.
Methods:Lomvastomig was characterized in cell cultures and preclinically in cancer mouse models. The phase 1, open-label, multicenter clinical study of lomvastomig included a dose-escalation part in patients with advanced and/or metastatic solid tumors and an expansion part with four tumor-specific cohorts, which enrolled checkpoint inhibitor (CPI)-experienced patients with melanoma and non-small-cell lung cancer (NSCLC) and CPI-naïve patients with SCLC and esophageal squamous cell carcinoma (ESCC). Primary and secondary objectives included safety/tolerability, maximum tolerated dose (MTD)/recommended dose for expansion (RDE), pharmacokinetics, drug receptor occupancy, and antitumor activity.
Results:39 and 95 patients were enrolled in the dose-escalation and expansion parts, respectively. Lomvastomig was well tolerated up to the highest tested dose of 2,100 mg every 2 weeks (Q2W). One dose-limiting toxicity was reported at 1,200 mg (grade 3 troponin T increase). No MTD was reached, and 2,100 mg Q2W was established as the RDE. Linear pharmacokinetics across the studied dose range suggested target saturation. Peripheral blood drug receptor occupancy on CD3+ and CD8+ was saturated at >90% throughout treatment for doses ≥70 mg. Objective responses were observed at 2,100 mg lomvastomig during dose-escalation (21%; n=19), and in the CPI-experienced melanoma (8%, n=38) and CPI-naïve ESCC (20%, n=15) expansion cohorts.
Conclusions:Lomvastomig had a tolerable and manageable safety profile at 2,100 mg Q2W. Clinical activity was limited in CPI-experienced patients with melanoma and NSCLC, while an encouraging signal was observed in CPI-naïve patients with ESCC.
Trial registration number:NCT03708328
(registration date: 2018–10-09).