Amping up With PemJAK

This study includes peripheral T-cell lymphoma (PTCL), cutaneous T-cell lymphomas (CTCL), and other lymphomas (Hodgkin Lymphoma \[HL\], Gray Zone Lymphomas \[GZL\], and Primary Mediastinal B-cell Lymphoma \[PMBCL\]) that has become resistant to commonly available chemotherapy (refractory), or it has re-occurred after treatment (relapsed). For PTCL participants, the main goal is to see how many achieve complete remission (no signs of cancer). For CTCL participants, the focus is on the overall response rate, meaning how many show improvement. This study is also open to patients with Hodgkin Lymphoma (HL), Gray Zone Lymphoma (GZL), and Primary Mediastinal B-cell Lymphoma (PMBCL), to understand if ruxolitinib can work in a disease that shares similar characteristics. It is important to note that ruxolitinib is an investigational drug and is not FDA approved for these lymphomas, but has shown to be effective in combination with immunotherapy in clinical trials. In addition, pembrolizumab is only FDA approved for HL and PMBCL - however is commonly used in PTCL, CTCL, and GZL in the relapsed setting as treatment options are limited and prior trials with pembrolizumab has shown effectiveness in treating these lymphomas.