Clinical trial NCT00691652
Conditions: Lymphoma
Keywords: extranodal marginal zone B-cell lymphoma of mucosa-associated lymphoid tissue nodal marginal zone B-cell lymphoma splenic marginal zone lymphoma recurrent adult Burkitt lymphoma recurrent adult diffuse large cell lymphoma recurrent adult diffuse mixed cell lymphoma recurrent adult diffuse small cleaved cell lymphoma recurrent adult grade III lymphomatoid granulomatosis recurrent adult immunoblastic large cell lymphoma recurrent adult lymphoblastic lymphoma recurrent grade 1 follicular lymphoma recurrent grade 2 follicular lymphoma recurrent grade 3 follicular lymphoma recurrent mantle cell lymphoma recurrent marginal zone lymphoma recurrent small lymphocytic lymphoma cutaneous B-cell non-Hodgkin lymphoma
Sponsor: OHSU Knight Cancer Institute
Start date: 2008-05-01; Completion date: 2009-04-01
Enrollment: 2 participants; Allocation: NA; Intervention model: SINGLE_GROUP

Brief summary:
RATIONALE: Drugs used in chemotherapy, such as clofarabine, 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 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 clofarabine together with rituximab may kill more cancer cells.

PURPOSE: This phase I/II trial is studying the side effects and best dose of clofarabine when given together with rituximab and to see how well they work in treating patients with relapsed B-cell non-Hodgkin lymphoma.

Detailed description:
OBJECTIVES:

Primary

* To determine the maximum tolerated dose of clofarabine in adult patients with relapsed CD20-positive B-cell non-Hodgkin lymphoma (NHL).
* To estimate objective response rates of clofarabine in combination with rituximab in these patients.

Secondary

* To determine the 1-year progression-free survival of this regimen using the mean tolerated dose in these patients.
* To determine the safety and efficacy of this regimen in these patients.
* To determine if clofarabine acts as an inhibitor of DNA methylation similar to cladribine by performing scientific correlates.
* To determine whether response to clofarabine alone or in combination with rituximab correlates with changes in global serum DNA methylation index.
* To identify the gene activated by clofarabine therapy by using genomic DNA and RNA array technology.

OUTLINE: This is a phase I, dose-escalation study of clofarabine followed by a phase II study.

Patients receive oral clofarabine once daily on days 1-14 of all courses and rituximab IV on days 1, 8, 15, and 22 of course one and then on day 1 of courses 2-8. Courses repeat every 4 weeks. After 2 courses of therapy, patients who are eligible for stem cell transplantation may either undergo transplantation or continue receiving study drugs until disease progression or unacceptable toxicity for up to a total of 8 courses of treatment.

Patients undergo blood sample collection periodically for correlative studies. Samples are analyzed to identify global DNA methylation differences and correlate changes in methylation index (MI) with patient outcome after treatment with clofarabine with or without rituximab via high performance liquid chromatography (HPLC); to determine differences in gene expression via microarray analysis and micro-RNA (miRNA) expression via quantitative polymerase chain reaction (PCR) in patients with high compared to low global DNA methylation index and miRNA expression for CD5+ B-lymphocytes obtained from pediatric tonsils and from B-lymphocytes of 5 healthy controls; and to determine gene expression and miRNA profiles in patients before and after treatment with clofarabine with or without rituximab via genomic DNA arrays.

After completion of study treatment, patients are followed once a year for 2 years.

Arms: arm 1: Phase I: Oral Clofarabine x 14 days for up to 8 cycles at assigned dose level below (1 cycle equals 14 days on drug, 14 days off).

Rituximab weekly for 4 weeks than monthly for up to 8 cycles on day 1 of cycle 375 mg/m2 IV

Dose Level 1: 2 mg Dose Level 2: 4 mg Dose Level 3: 6 mg

Phase II:

Oral Clofarabine x 14 days for up to 8 cycles (Dose determined from phase I) AND Rituximab weekly for 4 weeks than monthly for up to 8 cycles on day 1 of cycle 375 mg/m2 IV
Interventions: intervention 1: rituximab intervention 2: clofarabine intervention 3: DNA methylation analysis intervention 4: gene expression analysis intervention 5: microarray analysis intervention 6: polymerase chain reaction intervention 7: high performance liquid chromatography intervention 8: laboratory biomarker analysis
Intervention descriptions: intervention 1: Administered weekly times 4 weeks and then monthly during the study for up to 8 cycles and will be given on day 1 of clofarabine. A peripheral or central intravenous (IV) line will be established. The initial dose rate at the time of the first infusion should be 50/mg/hr for the first hour. If no toxicity is seen, the dose rate may be gradually escalated (50 mg/hr increments at 30 minute intervals) to a maximum of 300 mg/hr. If the first dose of rituximab is well tolerated, the starting flow rate for the administration of subsequent doses will be 100 mg/hr then gradually increased (100 mg/hr increments at 30 minute intervals) not to exceed 400 mg/hr. intervention 2: Phase 1 dosing: Initially, 3 patients will be enrolled into a dose level during the dose escalation portion. Level 1: 2mg fixed dose times 14 days for up to 8 cycles. Level 2: 4mg fixed dose times 14 days for up to 8 cycles. Level 3: 6mg fixed dose times 14 days for up to 8 cycles. Phase II dosing: The phase II dose of oral clofarabine will be determined from the phase 1. intervention 3: We will use an HPLC assay developed by Yu et al31 to determine the DNA methylation (DMI) index in peripheral blood and bone marrow of patients entering this trial and after treatment with clofarabine and rituxan intervention 4: Total RNA will be processed for determination of gene expression by microarray intervention 5: we will scan the microarray slides with an Axon scanner, and quantify data using the GeneSight software. Local background is subtracted and data points with no signal, high background, or spot asymmetry are eliminated. We will adjust genes with low expression and low signal intensity to a minimal raw value of 5: This avoids unwarranted mathematical distortions due to division by decimals \<\< 1. After calculating the ratio of the Cy5 /Cy3 fluorescence signal intensity for each gene, we normalize the data relative to the mean intensity from all genes. intervention 6: None intervention 7: Fifteen µg of DNA will be sonicated for 60 seconds on ice into 200 bp-1000 bp fragments. Samples are then denatured at 1000C for 5 minutes and cooled on ice to prevent re-annealing. Sixty units of nuclease S1 (Invitrogen) and 112.5 mu of snake venom phosphodiesterase I (Sigma) in 12 µl of S1 dilution buffer is then added to the samples and incubated at 370C for 18 hours. Samples are reheated to 1000C for 5 minutes, snap cooled again on ice, and another sixty units of nuclease S1 and 112.5 mu of snake venom phosphodiesterase I are added and incubated at 370C for another 4 to 6 hours. The pH of each sample was raised to 8.5 with 0.5 M Tris, pH 10. Two and a half units of alkaline phosphatase (Sigma) are added and incubated for 2 additional hours at 370C. One hundred µl of 0.05M potassium phosphate, pH 7 is added to final samples before 50 µl of the clear supernatant is injected into the reverse-phase high performance liquid chromatography (HPLC). intervention 8: 50 µl of the clear supernatant is injected into the reverse-phase high performance liquid chromatography (HPLC).

Protocol documents: