Evaluation of the Redox Profiles of Healthy and Pathological B Cells in Patients With Chronic Lymphocytic Leukemia

Chronic Lymphocytic Leukemia Clinical Trial

— LLC  

Official title:

Evaluation of the Redox Profiles of Healthy and Pathological B Cells in Patients With Chronic Lymphocytic Leukemia

Clinical Trial Details — Status: Recruiting

Administrative data

• NCT number: NCT03971565
• Other study ID #: 2018-52
• Secondary ID: 2018-A02574-51
• Status: Recruiting
• Start date: March 19, 2019
• Est. completion date: March 18, 2021

Study information

• Verified date: May 2019
• Source: Assistance Publique Hopitaux De Marseille
• Contact: Régis COSTELLO, PU-PH
• Phone: 491384150
• Email: regis.costello[@]ap-hm.fr
• Is FDA regulated: No
• Study type: Observational

Clinical Trial Summary

In recent years, considerable progress has been made in understanding the biology of chronic lymphocytic leukemia (CLL), resulting in the emergence of new therapeutic agents that have significantly improved the long-term survival of patients. However, LLC is still considered an incurable disease.

Cytogenetic abnormalities are frequently found in this pathology. Some abnormalities are associated with a more aggressive disease and a poor prognosis. The deletion of chromosome 17p (del (17p)), in particular, makes leukemic cells more resistant to standard therapy. Chromosome 17p contains the Tumor Protein 53 gene (TP53) which encodes the tumor suppressor protein 53 (P53) protein. P53 plays a central role in the regulation of important cellular functions such as DNA damage response, cell cycle regulation, apoptosis, and drug sensitivity of chemotherapies. In patients with CLL, the loss of p53 function is a major factor of chemoresistance and is associated with an adverse prognosis. The deletion (17p) is observed in approximately 5 to 10% of patients with CLL. In contrast, mutations in the TP53 gene are observed in approximately 30% of patients with CLL. This means that about one-third of patients with CLL have p53 dysfunction. TP53 and / or del (17p) mutated LLC cells show marked mitochondrial dysfunction. This dysfunction is responsible for a deregulation of intracellular redox phenomena, leading to an increase in oxidative stress and an overproduction of reactive oxygen derivatives (ROS).

Dimethyl Ampal Thiolester (DIMATE) is an active, competitive and irreversible inhibitor of aldehyde dehydrogenases (ALDH) 1 and 3. In vitro, DIMATE eradicates human cells from acute myeloblastic leukemia (AML). In patients with CLL, current treatments, particularly effective, do not specifically target pathological B cells. This results in chronic B lymphopenia and hypogammaglobulinemias that provide severe long-term infections, which is the leading cause of death in patients with CLL.

Through this study, we will study, in vitro, the expression of ALDH 1, 3, 9 but also of glutathione (GSH) and ROS on tumor B lymphocytes and healthy patients carrying an LLC. Depending on the differences in expression observed, DIMATE could specifically eradicate leukemic lymphocyte cells by sparing healthy lymphocytes, a hypothesis that will be tested in vitro. A special evaluation will be made in patients with del (17) and / or TP53 mutation whose prognosis is still considered unfavorable despite new therapeutic advances.

Recruitment information / eligibility

• Status: Recruiting
• Enrollment: 47
• Est. completion date: March 18, 2021
• Est. primary completion date: March 18, 2021
• Gender: All
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

• Major patient (greater than or equal to 18 years)

• Patients with 4 to 5 (or equivalent) grade 4 or 5 Matheol Score-confirmed chronic lymphocytic leukemia (CLL), whether prior to treatment or relapse

• For relapsed patients of their CLL, a minimum period of 90 days without treatment (including corticosteroids) compared to previous chemotherapy

• Patient having received the information and having given his non-opposition

Exclusion Criteria:

• Previous chemotherapy treatment outside of previous CLL therapy

• Active secondary cancer currently being treated with the exception of non-melanoma skin cancer or cervical cancer in situ

• Transformation into high grade lymphoma, Richter syndrome or pro-lymphocytic leukemia,

• Viral or fungal bacterial infection active at the time of screening Infection with human immunodeficiency virus,

• Medical or psychological condition that could interact with the ability to understand the study

Related Conditions & MeSH terms

• Chronic Lymphocytic Leukemia
• Leukemia
• Leukemia, Lymphocytic, Chronic, B-Cell
• Leukemia, Lymphoid

Intervention

Biological:
• Blood sample 5 milliliter
The blood of the patients will be collected during their hospitalization of the hematology department participating in the research

Locations

Country	Name	City	State
France	Assitance Publique Hôpitaux de Marseille	Marseille

Sponsors (1)

Lead Sponsor	Collaborator
Assistance Publique Hopitaux De Marseille

Country where clinical trial is conducted

France, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Differentiate tumor B lymphocytes from normal B cells	Marker analysis is performed by flow cytometry to determine the expression of labeled aldehydes deshydrogenases (ALDH) molecules on tumor lymphocytes.	24 months
Primary	Differentiate tumor B lymphocytes from normal B cells	Marker analysis is performed by flow cytometry to determine the expression of labeled Gluthation (GSH) molecules on tumor lymphocytes.	24 months
Primary	Differentiate tumor B lymphocytes from normal B cells	Marker analysis is performed by flow cytometry to determine the expression of labeled reactive oxygen derivatives (ROS) molecules on tumor lymphocytes.	24 months