RecruitingDrug trialNivolumab With Ruxolitinib in Relapsed or Refractory Classical Hodgkin LymphomaThis is a Phase I/II, multicenter, open-label, dose escalation/dose-expansion study to evaluate the tolerability, safety, and the maximum tolerated dose (MTD) of ruxolitinib when given with fixed dose nivolumab in patients with relapsed or refractory classical Hodgkin lymphoma (cHL).