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Safety, pharmacokinetics and pharmacodynamics of selgantolimod, an oral Toll-like receptor 8 agonist: a Phase Ia study in healthy subjects
Maribel Reyes 1 , Justin D Lutz 1 , Audrey H Lau 2 , Anuj Gaggar 2 , Ethan P Grant 3 , Adarsh Joshi 4 , Richard L Mackman 5 , John Ling 6 , Susanna K Tan 2 , Natarajan Ayithan 7 , Stephane Daffis 3 , Jacky Woo 3 , Peiwen Wu 4 , Tina Lam 8 , Simon P Fletcher 3 , Shyamasundaran Kottilil 7 , Bhawna Poonia 7 , Edward J Gane 9 , Anita Mathias 1 , Polina German 1
Affiliations
Affiliations
1
Clinical Pharmacology, Gilead Sciences, Foster City, CA, USA.
2
Clinical Research, Gilead Sciences, Foster City, CA, USA.
3
Biology, Gilead Sciences, Foster City, CA, USA.
4
Biostatistics, Gilead Sciences, Foster City, CA, USA.
5
Medicinal Chemistry, Gilead Sciences, Foster City, CA, USA.
6
Bioanalytical Chemistry, Gilead Sciences, Foster City, CA, USA.
7
Institute of Human Virology, University of Maryland, Baltimore, MD, USA.
8
Clinical Operations, Gilead Sciences, Foster City, CA, USA.
9
Auckland Clinical Studies, Auckland, New Zealand.
PMID: 32667286 DOI: 10.3851/IMP3363
Abstract
Background: Selgantolimod is a novel oral, selective Toll-like receptor 8 (TLR8) agonist in development for the treatment of chronic hepatitis B (CHB). TLR8 is an endosomal innate immune receptor and a target for treatment of viral infections. This first-in-human study investigated the safety, tolerability, pharmacokinetics (PK), and pharmacodynamics (PD) of selgantolimod in healthy volunteers.
Methods: Of 71 subjects enrolled, 59 received a single dose of selgantolimod (0.5, 1.5, 3, or 5 mg) or placebo, and 12 were evaluated for food effect. Safety, pharmacokinetics and pharmacodynamic activity by induction of cytokines, chemokines and acute phase proteins were assessed. PK/PD analyses were conducted.
Results: Single doses of 0.5-5 mg were generally safe. No serious adverse events (AEs) or AEs leading to discontinuation were reported, and most were Grade 1 in severity. Selgantolimod displayed rapid absorption and dose-proportional PK and PD activity. Food had minimal effect on PK but resulted in diminished PD activity. In PK/PD analyses, near-saturation of induction for most evaluated biomarkers occurred at the 5-mg dose.
Conclusions: Single doses of up to 5 mg selgantolimod were safe and induced dose-dependent PD responses. These data support evaluation of selgantolimod in combination with other agents in future clinical studies of CHB.
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