Safety, Tolerability, and Pharmacokinetics of Clesrovimab (MK-1654) in Infants (MK-1654-002)

Summary

The purpose of this study is to evaluate the safety, tolerability, pharmacokinetics, and incidence of anti-drug antibodies (ADAs) of single ascending doses of clesrovimab in healthy pre-term (born at 29 to 35 weeks gestational age) and full-term (born at \>35 weeks gestational age) infants. Participants will be randomized into 1 of 4 dose escalation panels (Panels A to D); an additional panel (Panel E) of full-term infants will receive the same dose as Panel D. Key safety and tolerability variables will be reviewed after each dose panel prior to administering the next-highest dose.

Timeline

Start

2018-09-20

Primary completion

2022-09-14

Completion

2022-09-14

Publications

• Results Madhi SA, Simoes EAF, Acevedo A, Novoa Pizarro JM, Shepard JS, Railkar RA, Cao X, Maas BM, Zang X, Krick A, Roadcap B, Vora KA, Aliprantis AO, Lee AW, Sinha A. A Phase 1b/2a Trial of a Half-life Extended Respiratory Syncytial Virus Neutralizing Antibody, Clesrovimab, in Healthy Preterm and Full-term Infants. J Infect Dis. 2025 Mar 17;231(3):e478-e487. doi: 10.1093/infdis/jiae581.
• Results Thambi N, Phuah JY, Staupe RP, Tobias LM, Cao Y, McKelvey T, Railkar RA, Aliprantis AO, Arriola CS, Maas BM, Vora KA. Development of High-Titer Antidrug Antibodies in a Phase 1b/2a Infant Clesrovimab Trial Are Associated With RSV Exposure Beyond Day 150. J Infect Dis. 2025 Mar 17;231(3):e488-e496. doi: 10.1093/infdis/jiae582.

Drugs

Indications