Theralux Extracorporeal Photochemotherapy (ECP) in Patients With Extensive Chronic Graft Versus Host Disease (GvHD)

The purpose of this study is to assess the tolerability and safety of two intensity levels of Theralux extracorporeal photochemotherapy in the treatment of subjects with steroid refractory or intolerant GvHD. The current hypothesis is that apoptotic cells re-injected into patients induce an immunomodulation effect alleviating the GvHD symptoms. Using the Theralux procedure, the dose of photodynamic treatment may be modulated to achieve the maximal immunomodulatory effects in the treated patients. The intervention is iterative extracorporeal photochemotherapy of autologous peripheral blood mononuclear cells (PBMC) with a rhodamine-derivative TH9402 (drug) and Theralux (device).