Primary Outcome Measures:
- Safety and Tolerability as measured by adverse events (AEs) and clinically relevant changes in laboratory values, vital signs, electrocardiograms (ECGs), and physical examination variables [ Time Frame: Specified timepoints in the protocol ] [ Designated as safety issue: Yes ]
Secondary Outcome Measures:
- Pharmacokinetics (PK) parameters (Cmax, AUC, t1/2, tmax) [ Time Frame: Specified timepoints in the protocol ] [ Designated as safety issue: No ]
- Pharmacodynamics (PD)parameters of percent and actual change from baseline for a panel of JAK-dependent biomarkers [ Time Frame: Specified timepoints in the protocol ] [ Designated as safety issue: No ]
Part A of the study will evaluate the safety and tolerability, PK, and PD of single ascending doses of VX-509.
Part B will evaluate the safety and tolerability, PK, and PD of multiple ascending doses of VX-509 administered for 14 days.
A total of 72 subjects will be enrolled: 36 subjects in Part A and 36 subjects in Part B.