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Disorders of Leukocytes

Disorders of Leukocytes

Leukocyte disorders can lead to either leukopenia, characterized by an abnormally low leukocyte count, or leukocytosis, marked by a very high leukocyte number.
Leukopenia may result from bone marrow disorders, autoimmune diseases, and infectious diseases. For example, conditions such as multiple myeloma and aplastic anemia can impair the bone marrow's ability to produce adequate leukocytes. Similarly, autoimmune diseases like lupus and viral infections such as HIV can prompt the immune...

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T Cell Activation and Clonal Selection

T Cell Activation and Clonal Selection

T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...

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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...

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Related Experiment Video

Updated: Apr 3, 2026

Chromosome Preparation From Cultured Cells

Chromosome Preparation From Cultured Cells

Published on: January 28, 2014

Is Having Clonal Cytogenetic Abnormalities the Same as Having Leukaemia.

Mirko Farina¹, Giuseppe Rossi, Daniella Bellotti

¹Department of Hematology, Spedali Civili, Brescia, Italy.

Acta Haematologica

|September 17, 2015

Summary

Clonal cytogenetic abnormalities in patients with acute myeloid leukemia (AML) do not always indicate active disease. Some patients can maintain remission for decades despite persistent genetic changes, highlighting diagnostic caution.

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Characterizing Mutational Load and Clonal Composition of Human Blood

Characterizing Mutational Load and Clonal Composition of Human Blood

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Characterizing Mutational Load and Clonal Composition of Human Blood

Characterizing Mutational Load and Clonal Composition of Human Blood

Published on: July 11, 2019

Area of Science:

Hematology
Cytogenetics
Oncology

Background:

Cytogenetic abnormalities are common in acute myeloid leukemia (AML).
Interpreting these abnormalities, especially in remission, requires careful consideration.

Observation:

A patient with AML achieved complete remission.
This patient exhibited persistent and transient clonal cytogenetic abnormalities for 22 years post-remission.
No leukemia recurrence was observed during this prolonged period.

Findings:

Clonal myeloid cell populations with mutations can persist without progressing to leukemia.
These findings challenge the assumption that all detectable clonal abnormalities signify active or impending AML.
The study emphasizes that not all mutations in myeloid cells lead to overt leukemia.

Implications:

More sensitive mutation detection techniques (e.g., PCR, sequencing) necessitate cautious interpretation of clonal abnormalities in AML patients.
Normal blood and bone marrow parameters are crucial in evaluating the significance of cytogenetic findings.
This case underscores the importance of long-term monitoring and nuanced diagnostic criteria in AML management.