6.3 Chronic Leukemia Flashcards
CLL (Chronic lymphocytic leukemia)
-what do you see on blood smear
-smudge cells, and increased lymphocytes
ATLL (Adult T Cell leukemia/lymphoma)
-proliferation of what cells
-mature CD4 cells
What leukemia is this?
- splenomegaly
- “dry tap” on bone marrow aspiration
- no lymphadenopathy
Hairy Cell leukemia
Pt with lytic bone lesions and hypercalcemia:
- what is 1st thought?
- Suspect what else, and how to differentiate?
- 1st thought is multiple myeloma
- However, can also be ATLL. Consider this, especially if pt also presents with a rash!
Hairy cell leukemia
- proliferation of what cells?
- appearance on blood smear
- proliferation of mature B cells (naive B cell proliferation is CLL)
- lymphocytes have ‘hairy’ cytoplasmic processes
ATLL (Adult T Cell leukemia/lymphoma)
- assoc with what virus
- commonly seen in what populations
- HTLV-1 (human T cell leukemia virus)
- it’s a retrovirus that infects CD4 T cells, like HIV
- common in Japan and Caribbean
CLL (Chronic lymphocytic leukemia)
-what cells proliferate, with what markers?
-proliferation of naive B cells, with CD5 and CD20. (CD5 is usu on T cells)
Mycosis Fungoides
- proliferation of what?
- how does it present?
- mature CD4 cells (mycosis fungoides is the most common form of CTCL–cutaneous T cell lymphoma)
- T cells infiltrate the skin. Localized skin rash, plaques, nodules. Aggregates of neoplastic cells in epidermis are called Pautrier microabscesses.
Mycosis Fungoides
- what happens when cells spread to blood
- appearance in blood smear
- If spread to blood, produces Sezary syndrome
- lymphocytes have cerebriform nuclei
What leukemia is this?
- skin rash
- lympadenopathy, hepatosplenomegaly
- lytic (punched-out) bone lesions and hypercalcemia
ATLL
Chronic leukemia
-typically what population
-older adults, usu insidious onset
Hairy cell leukemia
-clinical features (3)
- mnemonic “TRAP”
1. cells stain TRAP+
2. B cells trapped in red pulp (splenomegaly)
3. B cells trapped in bone marrow (b/c of marrow fibrosis. “dry tap” on bone marrow aspiration)
4. Cells trapped, so none in lymph nodes (no lymphadenopathy)
CLL (Chronic lymphocytic leukemia)
-complications (3)
- Hypogammaglobulinemia–loss of mature B cells
- Autoimmune hemolytic anemia–improper Ab formation results in Ab against own RBCs
- Transformation to diffuse large B-cell lymphoma (Richter transformation), marked clinically by englarging lymph node or spleen–(pt now has more aggressive tumor that is rapidly growing)
Pt with CLL, presents with enlarging lymph node or spleen
-suspect what?
- CLL is transforming into diffuse large B-cell lymphoma (Richter transformation)
- Pt now has a more aggressive tumor that is rapidly dividing.
Hairy cell leukemia
-Tx
- Use 2-CDA (cladribine)
- adenosine deaminase inhibitor–part of purine pathway. Adenosine accumulates to toxic levels in neoplastic B cells.