Diagnostic issues in chronic lymphocytic leukaemia (CLL)

Area of Science:

• Hematology
• Oncology
• Clinical Pathology

Background:

• Chronic lymphocytic leukemia (CLL) diagnosis integrates clinical and laboratory findings.
• Morphology and immunophenotype are primary diagnostic tools for CLL.
• Atypical CLL cases necessitate further investigation to differentiate from other B-cell disorders.

Purpose of the Study:

• To outline the diagnostic criteria and methods for chronic lymphocytic leukemia (CLL).
• To emphasize the role of immunophenotyping in confirming CLL diagnosis.
• To highlight the utility of molecular genetics and FISH analysis in managing atypical CLL cases and determining prognosis.

Main Methods:

• Morphological assessment of lymphocytes.
• Immunophenotyping using a distinct set of markers and a scoring system.
• Fluorescence in situ hybridization (FISH) for genetic deletions (17p, 11q).
• Analysis of IgVH gene mutational status.
• Histology for differential diagnosis in atypical cases.

Main Results:

• CLL lymphocytes possess a unique immunophenotypic signature.
• A scoring system enhances diagnostic certainty.
• CD38 and ZAP-70 expression correlate with prognostic impact.
• FISH analysis identifies key genetic alterations (17p, 11q deletions) influencing therapy.
• IgVH gene mutational status provides prognostic information.

Conclusions:

• Immunophenotyping is definitive for CLL diagnosis.
• Molecular genetics and FISH analysis are crucial for prognostic stratification and therapeutic decisions in CLL.
• Histology is essential for excluding other B-cell disorders in atypical CLL presentations.