Ultrastructural study of acute lymphocytic leukemia: comparison with immunologic studies

Area of Science:

• Hematology
• Oncology
• Cell Biology

Background:

• Acute lymphocytic leukemia (ALL) is a heterogeneous lymphoid malignancy.
• Accurate subclassification of ALL is crucial for prognosis and treatment.
• Morphological and immunophenotypic characteristics aid in ALL classification.

Purpose of the Study:

• To correlate electron microscopy findings with T and B cell markers in acute lymphocytic leukemia.
• To identify distinct morphological features of different ALL subtypes.

Main Methods:

• Electron microscopy was used to examine leukemic cells from 29 ALL patients.
• T and B cell markers were determined using sheep erythrocyte rosetting and surface immunoglobulin assays.

Main Results:

• 76% of cases were non-T, non-B ALL, characterized by small, inactive cells with nuclear folds.
• 21% of cases were T cell ALL, showing large, active cells, nuclear irregularity, and mediastinal masses.
• One B cell ALL case lacked distinct morphological features compared to non-T, non-B ALL.

Conclusions:

• Electron microscopy can reveal morphological differences between T cell ALL and non-T, non-B ALL.
• Non-T, non-B ALL predominantly exhibits small, inactive cell morphology.
• T cell ALL is associated with larger, active cells and mediastinal masses.