High-Dose Y-90-Ibritumomab Tiuxetan Added to Reduced-Intensity Allogeneic Stem Cell Transplant Regimen for Relapsed or Refractory Aggressive B-Cell Lymphoma

A Phase II Trial of High-Dose 90Y-Ibritumomab Tiuxetan (Anti-CD20) Followed by Fludarabine and Low-Dose Total Body Irradiation and HLA-Matched Allogeneic Hematopoietic Transplantation for Patients With Relapsed or Refractory Aggressive B-Cell Lymphoma

This phase II trial studies the side effects and how well high-dose yttrium-90 (Y-90)-ibritumomab tiuxetan (anti-cluster of differentiation [CD]20) followed by fludarabine phosphate, low-dose total body irradiation (TBI), and donor peripheral blood stem cell transplant (PBSCT) work in treating patients with aggressive B-cell lymphoma that has returned after a period of improvement (relapsed) or has not responded to previous treatment (refractory). Radiolabeled monoclonal antibodies, such as Y-90-ibritumomab tiuxetan, can find cancer cells and carry cancer-killing substances to them with less effect on normal cells. Giving chemotherapy, such as fludarabine phosphate, and TBI before a donor PBSCT helps stop the growth of cancer cells. It may also stop the patient's immune system from rejecting the donor's stem cells. However, high-dose radiolabeled antibodies also destroy healthy blood cells in the patient's body. When healthy stem cells from a donor are infused into the patient (stem cell transplant), they may help the patient's body replace these blood cells. Giving high-dose Y-90-ibritumomab tiuxetan followed by fludarabine phosphate, TBI, and donor PBSCT may be an effective treatment for patients with B-cell lymphoma.

PRIMARY OBJECTIVES:

I. To assess the safety and efficacy of 1.5 mCi/kg (max 120 mCi) 90Y-Ibritumomab tiuxetan (yttrium Y 90 ibritumomab tiuxetan) (anti-CD20) combined with fludarabine (fludarabine phosphate) (30 mg/m^2 x 3) and 2 gray (Gy) total body irradiation followed by human leukocyte antigens (HLA) matched allogeneic hematopoietic transplantation for patients with relapsed or refractory aggressive B-cell lymphoma.

OUTLINE:

Beginning 24-48 hours prior to therapy infusion, patients receive rituximab intravenously (IV) over 4-6 hours and then receive a therapy-dose of high-dose yttrium Y 90 ibritumomab tiuxetan IV over 30 minutes on day -14 prior to transplant. Patients also receive fludarabine phosphate IV on days -4 to -2 and undergo TBI followed by allogeneic PBSCT on day 0. Patients also receive cyclosporine orally (PO) twice daily (BID) on days -3 to 56 with taper to day 180 (related donor) or -3 to 100 with taper over 11 weeks (unrelated donor) and mycophenolate mofetil PO BID on days 0-27 (related donor) or PO thrice daily (TID) on days 0-40 with taper to day 96 (unrelated donor).

After completion of study treatment and assessments through ~day 100 following transplant, patients are followed up at 1, 3, 6, and 12 months and then annually up to 2 years thereafter.

Inclusion Criteria:

• Patients must have a histologically confirmed diagnosis of aggressive B-cell lymphoma (diffuse large B-cell lymphoma [DLBCL], Burkitt lymphoma [BL], etc.) expressing the CD20 antigen and have failed at least one prior standard systemic therapy
• Patients must have relapsed after high-dose therapy and autologous transplantation or be ineligible for high-dose therapy and autologous transplantation; patients that have failed autologous transplantation are those with persistent disease > 30 days after transplant; those ineligible for autologous transplant include those with chemoresistant disease (i.e., patients who have not achieved a partial response or better with their most recent chemotherapy regimen), are expected to have a poor outcome from autologous transplant (e.g., DLBCL relapsing within one year of rituximab, cyclophosphamide, doxorubicin hydrochloride, vincristine sulfate, prednisone [R-CHOP]-like chemotherapy, double hit lymphoma, v-myc myelocytomatosis viral oncogene homolog (avian) positive [MYC+] lymphoma, persistent positron emission tomography [PET] positivity after chemotherapy), are unable to collect sufficient or tumor-free autologous stem cells per Seattle Cancer Care Alliance (SCCA) standard practice, are unable to tolerate the high-dose autologous conditioning regimens, or who refuse a high-dose autologous transplant regimen
• Creatinine (Cr) < 2.0
• Bilirubin < 1.5 mg/dL with the exception of patients thought to have Gilbert's syndrome, who may have a total bilirubin above 1.5 mg/dL
• Aspartate aminotransferase (AST)/alanine aminotransferase (ALT) < 3 x upper limit of normal (ULN)
• Patients must have an expected survival without treatment of > 60 days and must be free of major infection including human immunodeficiency virus (HIV)
• Patients must have an HLA-identical related or HLA-matched unrelated donor

Exclusion Criteria:

• Receipt of systemic anti-lymphoma therapy withinthe following intervals prior to the therapeutic 90Y-ibritumomab tiuxetan dose:

  • < 30 days for intravenously-administered cytotoxic chemotherapy and/or monoclonal antibodies
  • < 5 half-lives for all other anti-cancer agents (e.g., targeted therapies, corticosteroids, immunomodulatory agents, etc.)

• Inability to understand or give an informed consent

• Active central nervous system lymphoma

• Pregnancy

• Fertile men or women unwilling to use contraceptive techniques during and for 12 months following treatment

• Southwest Oncology Group (SWOG)/Eastern Cooperative Oncology Group (ECOG) performance score >= 2

• High-dose chemotherapy or external beam radiation therapy to lung, liver, or kidneys > 20 Gy within the previous 100 days prior to therapeutic 90Y-ibritumomab tiuxetan dose

• Medical condition that would contraindicate allogeneic transplantation as per standard practice guidelines (e.g., impaired cardiopulmonary function, hepatitis, etc)