A Phase 1 First-in-Human Pharmacokinetic and Pharmacodynamic Study of JNJ-64264681, a Covalent Inhibitor of Bruton's Tyrosine Kinase.

JNJ-64264681 is an irreversible covalent inhibitor of Bruton's tyrosine kinase. This phase 1, first-in-human, 2-part (single-ascending dose [SAD]; multiple-ascending dose [MAD]) study evaluated the safety, tolerability, pharmacokinetics (PK), and pharmacodynamics (PD; Bruton's tyrosine kinase occupancy [BTKO]) of JNJ-64264681 oral solution in healthy participants. For SAD (N = 78), 6 increasing doses of JNJ-64264681 (4-400 mg) or placebo were evaluated in fasted males.

Approaches to improve drug tolerance and target tolerance in the assessment of neutralizing anti-drug antibodies.

Neutralizing anti-drug antibody (NAb) assays are inherently prone to the interference from drug and its soluble target, potentially resulting in erroneous results. An effective approach to improve drug tolerance of an NAb assay is pretreatment of samples with acid to dissociate immune complexes of NAb and drug, followed by separating NAbs from circulating drug before testing them in the assay. The acid pretreatment conditions were optimized to improve drug tolerance of cell-based and non-cell-based NAb assays.