Study of Biomarkers in Blood and Bone Marrow Samples From Patients With Previously Untreated Chronic Lymphocytic Leukemia



Status:Active, not recruiting
Conditions:Blood Cancer, Leukemia
Therapuetic Areas:Oncology
Healthy:No
Age Range:Any
Updated:1/26/2019
Start Date:October 2009

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Molecular Markers Of Chronic Lymphocytic Leukemia

RATIONALE: Studying samples of tumor tissue from patients with cancer in the laboratory may
help doctors identify and learn more about biomarkers related to cancer.

PURPOSE: This research study is looking at biomarkers in blood and bone marrow samples from
patients with previously untreated chronic lymphocytic leukemia.

OBJECTIVES:

- Determine the relevance of common and uncommon interphase cytogenetic abnormalities
related to baseline clinical features, complete response (CR), prolonged
progression-free survival (PFS), and overall survival (OS) in patients with previously
untreated chronic lymphocytic leukemia.

- Determine the significance of the absence of IgV_H gene mutational status as related to
the ability to predict CR, PFS, and OS in these patients.

- Correlate IgV_H gene mutational status with CD38 expression, ZAP-70 expression,
over-expression of Mcl-1, BAK-1, high Mcl-1:Bax ratio, p53 mutations or dysfunction,
high-risk karyotype abnormalities, and other molecular features associated with poor
outcome in these patients.

- Determine the prognostic significance of over-expression of Mcl-1, BAK-1, high Mcl-1:Bax
ratio, p53 mutations or dysfunction, ATM mutation, ATM expression, and other factors
that disrupt apoptosis with respect to CR, prolonged PFS, and OS.

- Determine if clonal evolution occurs in these biological markers at partial response or
disease relapse.

OUTLINE: This is a multicenter study.

Blood and bone marrow is collected at baseline, 3 months after completion of induction
therapy, 2 months after completion of consolidation therapy, 1 year after completion of study
treatment, and at disease relapse. Samples are analyzed by FISH for interphase cytogenetics,
PCR for IgV_H mutational status, flow cytometry for surface expression of CD38 cells, western
blot to assess Mcl-1, Bcl-2, BAK-1, ATM, ZAP-70, and Bar expression, and sequencing for p53
and ATM function.

DISEASE CHARACTERISTICS:

- Diagnosis of chronic lymphocytic leukemia

- Previously untreated disease

- Registered to receive treatment on a Cancer and Leukemia Group B protocol

PATIENT CHARACTERISTICS:

- Not specified

PRIOR CONCURRENT THERAPY:

- See Disease Characteristics
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