Extracorporeal Photopheresis (ECP) is a form of apheresis and photodynamic therapy in which
the peripheral blood is treated with 8-methoxypsoralen, which is then activated with UV
light. ECP is currently a standard therapy for cutaneous T-cell lymphoma (CTCL) and is also
effective for graft-versus-host disease (GVHD). The investigators would like to study the
outcomes (response rates) of patients receiving ECP treatment and other factors relating to
their disease and treatment, as well as procedural events, such as complications.