Treatment of Chronic Graft Versus Host Disease With Arsenic Trioxide

"Each patient will receive eleven perfusions of arsenic trioxide (0,15 mg/kg/Day - IV administration) over a 4 weeks period (one cycle).~Patients in partial response after the 1st cycle of ATO will be eligible to receive a second cycle of ATO as consolidation therapy. A delay of 8 weeks (from the first infusion of ATO) will be observed between the two cycles of ATO therapy.~The study duration will be 2 years (12 months recruitment + 12 months follow-up)."