Phase II Trial of LMB-2, Fludarabine and Cyclophosphamide for Adult T-Cell Leukemia
Status:
Active, not recruiting
Trial end date:
2021-12-31
Target enrollment:
Participant gender:
Summary
BACKGROUND:
- Cluster of differentiation 25 (CD25) (p55, Tac or interleukin 2 receptor (IL2R) alpha)
is strongly expressed in virtually 100% of patients with adult T-cell leukemia/lymphoma
(ATL), a highly aggressive human T-lymphotropic virus type 1 (HTLV-1) related malignancy
responding poorly to chemotherapy.
- In ATL, the humanized anti-CD25 monoclonal antibody (Mab) daclizumab produced 13-14%
responses, and the anti-CD52 Mab Alemtuzumab (Campath-1H) produced response lasting
greater than 2 months in 30% of 23 patients.
- LMB-2 is an anti-CD25 recombinant immunotoxin containing variable domains of murine MAb
anti-Tac and truncated Pseudomonas exotoxin.
- In a phase I trial at National Cancer Institute (NCI), the maximum tolerated dose (MTD)
of LMB-2 was 40 microg/Kg intravenous (IV) given every other day for 3 doses (every
other day (QOD) times 3). LMB-2 induced greater than 90% tumor reduction rapidly in all
3 ATL patients on protocol, but achieved only 1 partial response due to rapid tumor
progression and/or immunogenicity.
- In preclinical models, response from recombinant immunotoxins is limited by high
concentrations of soluble receptor in the blood and especially in the interstitial space
of the tumor. Synergism was observed with chemotherapy and immunotoxins, possibly due to
reduction of soluble receptor in tumor interstitium.
OBJECTIVES:
-To determine, in nonrandomized fashion, if after verifying its safety, fludarabine and
cyclophosphamide (FC) prior to LMB2 for ATL can result in low immunogenicity and a rate of
major response lasting greater than 2 months, which may be an improvement over that
demonstrated previously from Alemtuzumab (CAMPATH).
Secondary objectives:
- To determine the effect of 1 cycle of FC alone in ATL.
- To examine progression-free and overall survival in ATL after FC/LMB-2.
- Evaluate pharmacokinetics, toxicity, and monitor soluble CD25 and other tumor marker
levels in the serum.
- To study the effects of LMB-2 plus FC on normal B- and T-cell subsets by
fluorescence-activated cell sorting (FACS).
ELIGIBILITY:
- CD25 plus ATL, untreated or with prior therapy
- Eastern Cooperative Oncology Group (ECOG) 0-2, absolute neutrophil count (ANC),
platelets and albumin at least 1000, 75,000, and 3.0.
DESIGN:
- Fludarabine 25 mg/m(2) IV days 1-3
- Cyclophosphamide 250 mg/m(2) IV days 1-3
- LMB-2 30-40 micro g/Kg IV days 3, 5 and 7.
- LMB-2 dose: Begin with 30 microg/Kg times 3. Escalate to 40 microg/Kg if dose limiting
toxicity (DLT) in 0/3 or 1/6 at 30 microg/Kg. Continue at 40 microg/Kg if 0-1 of 6 have
DLT at 40 microg/Kg.
- Administer cycle 1 with FC alone. Two weeks after starting cycle 1, begin up to 6 cycles
of FC plus LMB-2 at minimum 20-day intervals.
- Accrual goals: 29-37 patients, which includes 4 replacements....