Pentostatin, Alemtuzumab, and Rituximab in Treating Patients With Relapsed or Refractory Chronic Lymphocytic Leukemia or Small Lymphocytic Lymphoma

This study is ongoing, but not recruiting participants.
Information provided by:
Mayo Clinic Identifier:
First received: April 29, 2008
Last updated: November 12, 2013
Last verified: November 2013

RATIONALE: Drugs used in chemotherapy, such as pentostatin, work in different ways to stop the growth of cancer cells, either by killing the cells or by stopping them from dividing. Monoclonal antibodies, such as alemtuzumab and rituximab, can block cancer growth in different ways. Some block the ability of cancer cells to grow and spread. Others find cancer cells and help kill them or carry cancer-killing substances to them. Giving pentostatin together with alemtuzumab and rituximab may kill more cancer cells.

PURPOSE: This phase II trial is studying how well giving pentostatin together with alemtuzumab and rituximab works in treating patients with relapsed or refractory chronic lymphocytic leukemia or small lymphocytic lymphoma.

Condition Intervention Phase
Biological: alemtuzumab
Biological: rituximab
Biological: sargramostim
Drug: pentostatin
Genetic: polymerase chain reaction
Other: flow cytometry
Other: immunoenzyme technique
Other: immunohistochemistry staining method
Other: laboratory biomarker analysis
Phase 2

Study Type: Interventional
Study Design: Masking: Open Label
Primary Purpose: Treatment
Official Title: Treatment of Relapsed/Refractory Chronic Lymphocytic Leukemia/Small Lymphocytic Lymphoma (CLL) With Pentostatin, Alemtuzumab, and Low Dose Rituximab: A Phase II Clinical Trial

Resource links provided by NLM:

Further study details as provided by Mayo Clinic:

Primary Outcome Measures:
  • Proportion of complete responses [ Designated as safety issue: No ]

Secondary Outcome Measures:
  • Overall response rate (complete and partial response) [ Designated as safety issue: No ]
  • Overall survival [ Designated as safety issue: No ]
  • Progression-free survival [ Designated as safety issue: No ]
  • Duration of response [ Designated as safety issue: No ]
  • Time to subsequent therapy [ Designated as safety issue: No ]
  • IgVh gene mutation, CD38, ZAP-70, CD49d, and FISH status of chronic lymphocytic leukemia clones [ Designated as safety issue: No ]

Estimated Enrollment: 42
Study Start Date: July 2008
Primary Completion Date: April 2013 (Final data collection date for primary outcome measure)
Detailed Description:



  • To assess the rate of complete and overall response in patients with relapsed or refractory chronic lymphocytic leukemia or small lymphocytic lymphoma treated with pentostatin, alemtuzumab, and low-dose rituximab.
  • To assess response to this treatment regimen using an expanded definition of response, including CT scans of chest-abdomen-pelvis, immunohistochemical analysis for residual disease in the bone marrow, and sensitive flow cytometry for minimal residual disease in patients who achieve a complete clinical remission.
  • To monitor and assess toxicity of this treatment regimen.


  • To determine the overall and progression-free survival, duration of response, and time to next treatment.
  • To assess the correlation between individual prognostic markers (17p-, 11q-, unmutated VH gene, VH3-21, ZAP-70+, CD38+, CD49d, and β2 microglobulin, miRNA profiles, angiogenesis status, and karyotypes of CpG stimulated cells) and clinical outcome.


  • Measure the effect of monoclonal antibody concentration on the complement fixation-antibody dependent cellular cytotoxicity interaction.
  • Assess minimal residual disease status in responding patients using sensitive flow cytometry and correlate with overall and progression-free survival, duration of response, and time to next treatment.
  • Detail the in vivo effect of this treatment regimen on critical aspects of the immune system in these patients.

OUTLINE: This is a multicenter study.

  • Course 1: Patients receive pentostatin IV on days 8 and 22; alemtuzumab subcutaneously (SC) on days 3-5, 8, 10, 12, 15, 17, 19, 22, 24, 26, 29, 31, and 33; rituximab IV on days 1, 3, 5, 8, 10, 12, 15, 17, 19, 22, 24, 26, 29, 31, and 33; and sargramostim (GM-CSF) SC on days 10-14 and 24-28. Patients then proceed to course 2.
  • Courses 2 and 3: Patients receive pentostatin IV on days 1 and 15; alemtuzumab SC and rituximab IV on days 1, 3, 5, 8, 10, 12, 15, 17, 19, 22, 24, and 26; and GM-CSF SC on days 3-7 and 17-21. After completion of course 2, patients with a complete response proceed to observation. Patients with a partial response or stable disease receive another course of therapy (course 3).

Treatment continues in the absence of disease progression or unacceptable toxicity.

Blood is collected on days 1, 3, 8, and 10 of course 1 for monoclonal antibody studies. Samples are analyzed for serum concentration of alemtuzumab and rituximab by ELISA and PCR; CH50 assay; complement activation and cytokine levels by ELISA; NK cell activation; and NK cell phenotype by immunofluorescent staining and flow cytometry.

After completion of study treatment, patients are followed up monthly for 6 months, every 3 months for 6 months, and then every 6-12 months for up to 5 years.


Ages Eligible for Study:   18 Years and older
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No


  • Histologically or cytologically confirmed chronic lymphocytic leukemia (CLL) or small lymphocytic lymphoma (SLL) meeting the following criteria:

    • Minimum threshold peripheral blood lymphocyte count of 5 x 10^9/L (CLL variant) OR adenopathy > 1 cm or palpable splenomegaly (SLL variant)
    • Immunophenotypic demonstrations of a population of B lymphocytes (as defined by CD19+) that are monoclonal (by light chain exclusion) AND have ≥ 3 of the following characteristics:

      • CD5+
      • CD23+
      • Dim surface light chain expression
      • Dim surface CD20 expression
      • FISH analysis is negative for IGH/CCND1 and/or immunostaining is negative for cyclin D1 expression
  • Must have progressive disease as indicated by any of the following characteristics (based on standard criteria for treatment):

    • Symptomatic CLL characterized by any of the following:

      • Weight loss > 10% within the past 6 months
      • Extreme fatigue
      • Fevers > 38.5° C (not due to infection)
      • Drenching night sweats without evidence of infection
    • Evidence of progressive bone marrow failure with hemoglobin < 11 g/dL or platelet count < 100 x 10^9/L
    • Massive and progressive splenomegaly (> 6 cm below left costal margin)
    • Massive (> 10 cm) or rapidly progressive lymphadenopathy


  • ECOG performance status 0-3
  • Creatinine ≤ 2 times upper limit of normal (ULN)
  • Total bilirubin ≤ 3.0 times ULN OR direct bilirubin ≤ 1.5 times ULN
  • AST ≤ 3.0 times ULN (unless due to hemolysis or CLL)
  • Willing to provide mandatory blood samples for research studies
  • Not pregnant or nursing
  • Negative pregnancy test
  • Fertile patients must use effective contraception during and for up to 12 months after completion of study treatment
  • No other active primary malignancy that requires treatment or limits survival to ≤ 2 years
  • No active autoimmune hemolytic anemia, immune thrombocytopenia, or pure red blood cell aplasia
  • No New York Heart Association class III or IV heart disease
  • No myocardial infarction within the past month
  • No uncontrolled infection
  • No HIV infection or AIDS
  • No active hepatitis B infection (i.e., HBsAg or HBeAg positivity) or hepatitis C infection by serology
  • No other comorbid condition


  • No more than 3 prior treatment regimens for CLL that included purine analogue drugs (e.g., fludarabine, pentostatin, or cladribine) OR previously untreated CLL in patients with high-risk disease due to 17p13 deletion on FISH analysis
  • More than 4 weeks since prior major surgery
  • More than 2 months since prior alemtuzumab
  • Prior corticosteroids allowed
  • No concurrent continuous systemic corticosteroids
  Contacts and Locations
Please refer to this study by its identifier: NCT00669318

United States, Iowa
Holden Comprehensive Cancer Center at University of Iowa
Iowa City, Iowa, United States, 52242-1002
United States, Minnesota
Mayo Clinic
Rochester, Minnesota, United States, 55905
United States, Virginia
University of Virginia Cancer Center
Charlottesville, Virginia, United States, 22908
Sponsors and Collaborators
Mayo Clinic
Study Chair: Clive S. Zent, MD Mayo Clinic
  More Information

Additional Information:
No publications provided

Responsible Party: Clive S. Zent, Mayo Clinic Cancer Center Identifier: NCT00669318     History of Changes
Other Study ID Numbers: LS0881, LS0881, 08-000673
Study First Received: April 29, 2008
Last Updated: November 12, 2013
Health Authority: United States: Food and Drug Administration

Keywords provided by Mayo Clinic:
refractory chronic lymphocytic leukemia
recurrent small lymphocytic lymphoma
B-cell chronic lymphocytic leukemia

Additional relevant MeSH terms:
Leukemia, Lymphocytic, Chronic, B-Cell
Leukemia, Lymphoid
Neoplasms by Histologic Type
Leukemia, B-Cell
Lymphoproliferative Disorders
Lymphatic Diseases
Immunoproliferative Disorders
Immune System Diseases
Campath 1G
Antineoplastic Agents
Therapeutic Uses
Pharmacologic Actions
Adenosine Deaminase Inhibitors
Enzyme Inhibitors
Molecular Mechanisms of Pharmacological Action
Immunosuppressive Agents
Immunologic Factors
Physiological Effects of Drugs
Antirheumatic Agents processed this record on April 17, 2014