This project is a retrospective and prospective chart review of patients who present at Northwestern Medical Faculty Foundation clinic with the diagnosis of CTCL. It includes Mycosis Fungoid, Sézary Syndrome and other subtypes of CTCL, like Cytotoxic Cutaneous T-cell lymphomas. Those patients that received or will be prescribed per standard of care with romidepsin for at least 1 month (or at least more than 1 cycle of treatment) will be reviewed. We estimate that 50 patients could fit the criteria above, since the drug started to be prescribed in the Dermatology Clinic. Clinical information regarding diagnosis, stage, prior treatment received, and therapeutic response will be recorded. Blood parameters such as cell blood count, calcium, magnesium, potassium, and albumin at baseline and after treatment with romidepsin will be reviewed, and recorded if abnormalities are detected. Electrocardiogram changes will also be checked and recorded. All the information will be gathered in an excel spreadsheet in order to perform a descriptive analysis. We aim to assess the use of romidepsin as maintenance therapy and assess which schedule of treatment was most frequently used and associated with a better response with fewer side effects.