Activity, Safety and Pharmacokinetics in Pediatric Subjects With Moderate and Severe Chronic Graft vs. Host Disease After Allogeneic Stem Cell Transplant

This open-label, single-arm, Phase II multi-center study enrolled 46 participants and investigated the activity, pharmacokinetics and safety of ruxolitinib added to the subject's immunosuppressive regimen among infants, children, and adolescents aged ≥28 days to \<18 years old with either moderate to severe treatment-naive cGvHD or SR-cGvHD. Although 46 participants were enrolled,1 participant (enrolled in the ≥6y to \<12y age group) received study treatment beyond protocol requirements and was excluded from analyses.

Subjects were grouped according to their age as follows: * Group 1 included subjects ≥12y to \<18y * Group 2 included subjects ≥6y to \<12y * Group 3 included subjects ≥2y to \<6y and * Group 4 included subjects ≥28days to \<2y. Enrollment initiation into the youngest age group, Group 4, was subject to the availability of data in this age group from another study, as well as a review of available PK, safety, and activity data generated from Groups 1 to 3 in the current study. At least 5 evaluable participants per group were needed for the primary analysis in Groups 1, 2 and 3. No minimum number of evaluable participants were needed in Group 4. Enrollment was completed prior to the availability of the data and so no subjects were enrolled in Group 4. After a screening period of Day -28 to Day -1: eligible subjects started study treatment on Cycle 1 Day 1 and were treated for up to a maximum of 3 years (39 cycles/156 weeks) or until early discontinuation. Subjects who discontinued study treatment for any reason earlier than 39 cycles were followed every 6 months until 3 years from their first dose of study treatment was reached.