Clinical Research Directory

Inclusion Criteria: * Participants must meet the following criteria on screening examination to be eligible to participate in the study: * Recipient of allogeneic hematopoietic stem cell transplantation * Participants must have steroid-refractory cGVHD. Steroid-refractory cGVHD is defined as having persistent signs and symptoms of cGVHD (Appendix D; section 17.4) despite the use of prednisone at ≥ 0.25 mg/kg/day (or 0.5 mg/kg every other day) for at least 4 weeks (or equivalent dosing of alternate glucocorticoids) without complete resolution of signs and symptoms. Participants with either extensive chronic GVHD or limited chronic GVHD requiring systemic therapy are eligible. * Stable dose of glucocorticoids for 4 weeks prior to enrollment * No addition or subtraction of other immunosuppressive medications (e.g., calcineurin-inhibitors, sirolimus, mycophenolate-mofetil) for 4 weeks prior to enrollment. The dose of immunosuppressive medicines may be adjusted based on the therapeutic range of that drug * Patient age 18 years old. Because no dosing or adverse event data are currently available on the use of IL-2 in participants \<18 years of age, children are excluded from this study. * ECOG performance status 0-2 (Appendix A; section 17.1) * Participants must have adequate organ function as defined below: * Hepatic: Adequate hepatic function (total bilirubin \<2.0 mg/dl-exception permitted in participants with Gilbert's Syndrome; AST (SGOT)/ALT (SGPT) ≤2x ULN), unless hepatic dysfunction is a manifestation of presumed cGVHD. For participants with abnormal LFTs as the sole manifestation of cGVHD, documented GVHD on liver biopsy will be required prior to enrollment. Abnormal LFTs in the context of active cGVHD involving other organ systems may also be permitted if the treating physician documents the abnormal LFTs as being consistent with hepatic cGVHD, and a liver biopsy will not be mandated in this situation. * Pulmonary: FEV1 ≥ 50% or DLCO(Hb) ≥ 40% of predicted, unless pulmonary dysfunction is deemed to be due to chronic GVHD * Renal: Serum creatinine less than upper limit of normal institutional limits or creatinine clearance \> 60 mL/min/1.73 m2 for participants with creatinine levels above institutional normal. * Adequate bone marrow function indicated by ANC\>1000/mm3 and platelets\>50,000/mm3 without growth factors or transfusions * Cardiac: No myocardial infarction within 6 months prior to enrollment or NYHA Class III or IV heart failure, uncontrolled angina, severe uncontrolled ventricular arrhythmias, or electrocardiographic evidence of acute ischemia or active conduction system abnormalities. Prior to study entry, any ECG abnormality at screening must be documented by the investigator as not medically relevant. * The effects of IL-2 on the developing human fetus are unknown. For this reason and because chemotherapeutic agents are known to be teratogenic, women of child-bearing potential and men must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry and for the duration of study participation. Should a woman become pregnant or suspect she is pregnant while participating in this study, she should inform her treating physician immediately. * Ability to understand and the willingness to sign a written informed consent document Exclusion Criteria: * Participants who exhibit any of the following conditions at screening will not be eligible for admission into the study. * Ongoing prednisone requirement \>1 mg/kg/day (or equivalent) * Concurrent use of calcineurin-inhibitor plus sirolimus (either agent alone is acceptable) * History of thrombotic microangiopathy, hemolytic-uremic syndrome or thrombotic thrombocytopenic purpura * New chronic GVHD therapies (e.g. gleevec, extracorporeal photopheresis, rituximab, immunosuppressive medications) in the 4 weeks prior * Low-dose IL-2 therapy in the 4 weeks prior * Post-transplant exposure to T-cell or alternative IL-2 targeted medication (e.g. ATG, alemtuzumab, basiliximab, denileukin diftitox) within 100 days prior * Donor lymphocyte infusion within 100 days prior * Active malignant relapse * Active uncontrolled infection * Inability to comply with IL-2 treatment regimen * Organ transplant (allograft) recipient * HIV-positive individuals on combination antiretroviral therapy are ineligible because of the potential for pharmacokinetic interactions with the agents used after allogeneic HSCT. In addition, these individuals are at increased risk of lethal infections. Appropriate studies will be undertaken in participants receiving combination antiretroviral therapy when indicated. * Individuals with active uncontrolled hepatitis B or C are ineligible as they are at high risk of lethal treatment-related hepatotoxicity after HSCT. * Other investigational drugs within 4 weeks prior to enrollment, unless cleared by the Principal Investigator. * Pregnant women are excluded from this study because of the potential for teratogenic or abortifacient effects. Because there is an unknown but potential risk of adverse events in nursing infants secondary to treatment of the mother, breastfeeding should be discontinued.