most closely human leukocyte antigen (hla)-matched bk virus-specific t lymphocytes (viralym-b)

Conditions: BK Virus Infection

Summary: patients enrolled on this study will have received a stem cell transplant. after a transplant, while the immune system grows back the patient is at risk for infection. some viruses can stay in the body for life, and if the immune system is weakened (like after a transplant), they can cause life-threatening infections. bk virus (bkv) is a virus that can cause serious life-threatening infections in patients who have weak immune systems. it affects the urinary tract, and can cause frequent urination, blood in the urine, and severe pain. investigators want to see if they can use a kind of white blood cell called t cells to treat bkv infections that occur after a transplant. investigators have observed in other studies that treatment with specially trained t cells has been successful when the cells are made from the transplant donor. however as it takes 1-2 months to make the cells, that approach is not practical when a patient already has an infection. investigators have now generated bkv-specific t cells from the blood of healthy donors and created a bank of these cells. investigators have previously successfully used frozen virus-specific t cell lines generated from healthy donors to treat virus infections after bone marrow transplant, and have now improved the production method and customized the bank of lines to specifically and exclusively target bkv. in this study, investigators want to find out if the banked bkv-specific t cells derived from healthy donors are safe and can help to treat bk virus infection. the bkv-specific t cells (viralym-b) are an investigational product not approved by the food and drug administration (fda).

to make bkv-specific t cells (viralym-b cells), small pieces of protein called peptides that come from bkv were mixed with blood cells from healthy donors. these peptides train a kind of white blood cell called t cells to recognize and kill cells that are infected with bkv. these t cells were then grown in special growth factors in special flasks in the lab. once we made sufficient numbers of cells, we tested them to make sure they recognized cells infected by bk virus, and then we froze them. when we think the subject needs them, viralym-b cells will be thawed and injected into the intravenous line. to prevent an allergic reaction, prior to receiving viralym-b cells the subject may be given diphenhydramine (benadryl) and acetaminophen (tylenol). the subject will remain in the clinic for at least one hour after the infusion. after the subject receives the cells, the transplant doctor will monitor the levels of bk virus in the blood. we will also take blood to see how long the cells we gave the subject are lasting in the body. subjects will continue to be followed by their transplant doctors after the injection. the subject will either be seen in the clinic or they will be contacted by a research nurse to follow up for this study every week for 6 weeks, then at 3, 6 and 12 months. the subject may have other visits for their standard care. subjects will also have regular blood tests done to follow their counts and the viral infection as part of their standard care. to learn more about the way viralym-b cells are working in the body, an extra 30-40 ml (6-8 teaspoons) of blood will be taken before the infusion and then at study follow-up visits at 1, 2, 3, 4 and 6 weeks, and 3 months after the infusion. blood should come from the central intravenous line, and should not require extra needle sticks. all participants on this study will be infused with the same number (dose) of cells. if viralym-b infusion has helped the subjects infection or if they have had a treatment, for example with steroid drugs that might have destroyed the t cells the subject was given, then they are allowed to receive up to 4 additional infusions of the viralym-b cells at the same initial dose level from 28 days after their initial infusion. following infusions should be at least 14 days apart. after each viralym-b cells infusion, subjects will be monitored as described above.

Eligibility criteria:
inclusion criteria: 1. prior myeloablative or non-myeloablative allogeneic hematopoietic stem cell transplant using either bone marrow or peripheral blood stem cells or single or double cord blood within 24 months. 2. persistent or recurrent bk virus infection or disease despite at least 7 days of standard therapy or failure of therapy as described below or if unable to tolerate standard therapy. standard therapy is defined as antiviral therapy with cidofovir or an alternative antiviral agent if patient will not tolerate cidofovir therapy because of poor renal function. i. bk virus infection: defined as the presence of bk virus positivity as detected by polymerase chain reaction (pcr) or culture in one site such as blood or urine. ii. bk virus disease: defined as presence of bk virus detectable by culture or pcr in blood or urine or other body fluids and symptoms of disease including but not limited to persistent microscopic and macroscopic hematuria or detectable bk virus in more than one site. iii. failure of therapy: defined as a rise or a fall of less than 50% in viral load in peripheral blood or any site of disease as measured by pcr (or any other quantitative assay) after 7 days of antiviral therapy. 3. clinical status at enrollment to allow tapering of steroids to equal or less than 0.5 mg/kg/day prednisone (or equivalent). 4. hemoglobin (hgb)\>8.0 (may be transfused) 5. received transplant care locally and will remain in the houston area for at least 6 weeks post viralym b infusion 6. pulse oximetry of \> 90% on room air 7. available viralym-b t cell line 8. negative pregnancy test in female patients if applicable (childbearing potential who have received a reduced intensity conditioning regimen). 9. informed consent explained to, understood by and signed by patient/guardian. patient/guardian given copy of informed consent. exclusion criteria: 1. patients receiving (anti-thymocyte globulin) atg, campath or other immunosuppressive t cell monoclonal antibodies within 28 days of treatment with viralym-b 2. patients with other uncontrolled/progressing infections defined as hemodynamic instability attributable to sepsis or new symptoms, worsening physical signs or radiographic findings attributable to infection. for bacterial infections, patients must be receiving definitive therapy and have no signs of progressing infection for 72 hours prior to enrollment. for fungal infections patients must be receiving definitive systemic anti-fungal therapy and have no signs of progressing infection for 1 week prior to enrollment. persisting fever without other signs or symptoms will not be interpreted as progressing infection. 3. patients who have received donor lymphocyte infusion (dli) within 28 days of viralym-b infusion. 4. patients who have received other investigational drugs within 28 days of viralym-b infusion 5. patients with active acute graft versus host disease (gvhd) grades ii-iv. 6. active and uncontrolled relapse of malignancy

Keywords: bk virus virus specific t cells viral infections