Differential Expression of CD200 in B-chronic Lymphoproliferative Disorders by Multicolour Flow Cytometry

• Conditions: Neoplasms

• Registration Number: NCT03712488
• Lead Sponsor: Assiut University

Brief Summary

The investigator's goals in this study are to assess :

1. Differential expression of CD200 by using flow cytometric immune-phenotyping in broad range of patients with B-chronic lymphoproliferative disorders (B-CLPD)

2. Role of CD200 in diagnosis , classification and potential value in differential diagnosis

3. CD200 expression level at different anatomic sites

Detailed Description

B-Chronic lymphoproliferative disorders (B-CLPDs) are heterogeneous group of disorders with variable clinical presentations and outcomes. They are classified into : chronic lymphocytic leukaemia (CLL), B-cell prolymphocytic leukaemia (B-PLL), hairy cell leukaemia (HCL), and mantle cell lymphoma (MCL), marginal zone lymphoma (MZL), follicular lymphoma (FL) and lymphoplasmacytic lymphoma/WaldenstrÖm macroglobulinaemia (LPL/WM) in leukaemia phase.

Characterization of CLPDs by immunophenotyping (IPT) has become an important and widely used method in hematology. Immunophenotyping is indispensable for the diagnosis of B-CLPDs through recognition of restricted light chain expression and characteristic phenotypes of separate entities.

Immunophenotypic characterization of lymphoid neoplasms is important for diagnosis, sub-classification, and staging and can also play a role in monitoring minimal residual disease. However, the differential diagnosis may be difficult to resolve in some cases, for example, between B-cell neoplasms with full or partial CD5 expression.

CD200 has recently been identified as a potentially useful antigen for flow cytometric immunophenotyping of lymphoid neoplasms, particularly those of the B lineage.

CD200 belongs to the immunoglobulin superfamily and is composed of a light chain-like structure with two extracellular variable- and constant-like domains followed by a transmembrane segment and a cytoplasmic tail.5 CD200 is expressed by various cell types, including B cells, a subset of T cells (including activated T cells), thymocytes, endothelial cells, and neurons .

CD200 generates an immunosuppressive signal by binding to its cognate receptor, CD200 receptor 1 (CD200R1) , which is expressed specifically in granulocytes and monocytes and in a subset of T cells. CD200 appears to play a role in the regulation of antitumor activity and these findings are the basis for ongoing clinical trials using anti-CD200 therapy for chronic lymphocytic leukemia (CLL)

Study Timeline

• Status Verified: 2018-10
• Study First Submitted: 2018-10-17
• Study First Submitted QC: 2018-10-18
• Last Update Submitted: 2018-10-18
• Study First Posted: 2018-10-19
• Last Update Posted: 2018-10-19
• Study Start: 2018-12-15
• Primary Completion: 2020-08-30
• Study Completion: 2021-04-01

Recruitment & Eligibility

• Status: UNKNOWN
• Sex: All
• Target Recruitment: 50

Inclusion Criteria

• All newly diagnosed patients with B-chronic lymphoproliferative disorders

Exclusion Criteria

• 1. Patient refusal 2) Patients diagnosed T-cell non-hodgkins lymphoma 3) Patients receiving chemo and/or radiotherapy 4) Patients on steroid therapy for any other cause 5) Patients receiving any immunosuppressive drugs

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
Differential expression of CD200 by using flow cytometric immune-phenotyping in B-chronic lymphoproliferative disorders (B-CLPD)	baseline	Analysis of expression of CD200 in B-CLPDs for differential diagnosis of subtypes of B-CLPDs