Ruxolitinib Phosphate to Treat Diffuse Large B-Cell or Peripheral T-Cell Non-Hodgkin Lymphoma After Stem Cell Transplant

PRIMARY OBJECTIVES: I. Assess the overall response rate (ORR) of subjects with relapsed diffuse large B-cell lymphoma (DLBCL) and peripheral T-cell lymphoma (PTCL) who are relapsed or refractory to front-line treatment and ineligible for stem cell transplantation or have recurrent disease after stem cell transplantation to oral ruxolitinib (ruxolitinib phosphate). SECONDARY OBJECTIVES: I. Evaluate safety of oral ruxolitinib in subjects with DLBCL and PTCL. II. Determine progression-free survival (PFS), duration of response, and overall response (OS) in subjects with DLBCL and PTCL. TERTIARY OBJECTIVES: I. Explore the relationship between responses to oral ruxolitinib and alterations in gene expression profiling (GEP) signatures as well as biomarker immunophenotypic changes related to JAK2/STAT3, NF-kB, PI3K/AKT, and mTOR pathways. II. Evaluate potential effect of oral ruxolitinib exposure on JAK2/STAT3 pathway inhibition in serial tumor samples. OUTLINE: Patients receive ruxolitinib phosphate orally (PO) twice daily (BID) on days 1-28. Courses repeat every 28 days in the absence of disease progression or unacceptable toxicity. After completion of study treatment, patients are followed up every 3 months for 1 year and then every 6 months thereafter.