Hema Flashcards
Following a myelodysplastic syndrome or myeloproliferative disorder
* Without antecedent myelodysplastic syndrome
Acute myeloid leukemia with multilineage dysplasia
Abnormalities in granulopoiesis include hypogranular cytoplasm and hypolobulated or
bizarrely segmented nuclei
Acute myeloid leukemia with multilineage dysplasia
Acute myeloid leukemia with multilineage dysplasia usually occurs in these age grp
ADULTS
characterized by ringed sideroblasts, vacuolated cytoplasm, and
nuclei that are multiple, fragmented, or megaloblastic
Abnormal erythropoiesis
small or have single-lobed or multiple, discrete nuclei in AML with multilineage dysplasia
Abnormal megakaryocytes
In MDS, from alkylating agent result, it may progress to this type of AML
AML with maturation (M2)
Less common: M4, M5, M6, M7
AML (FAB) result from topoisomerase type II inhibitors
M4
M5
average interval between topoisomerase II inhibitors treatment and AML
33 months
(without passing MDS phase)
examples of Topoisomerase type II inhibitor
etoposide
doxorubicin
Classifies CML by chronic, accelerated, or blast phase
WHO
typically seen in blood smear with CML
small megakaryocytes
granulocytic hyperplasia
Describe chronic phase of CML
▪ mild anemia; leukocytosis (>25x109
/L)
▪ increased myelocytes
and mature neutrophils
▪ Basophils increased
▪ Eosinophilia
▪ Serum LDH and uric acid – increased (due to excessive cell proliferation)
Describe ACCELERATED PHASE of CML
Fulfilling at least one of the following:
o Increasing WBC ct
o Increased spleen size
o Persistent thrombocytopenia (<100 x109
/L) or thrombocytosis (>1000 x 109
/L)
o Blast: 10-19%
o Basophilia: > 20%
o Clonal evolution
Describe BLAST PHASE of CML
one or more of these features:
o Blast: >20% of peripheral WBCs or nucleated BM cells
o Blast proliferating in extramedullary site (skin, lymph node, spleen)
o Large aggregates of blasts in BM
WHO DIAGNOSTIC CRITERIA FOR CML:
- Persistent monocytosis (>1x109
/L) - No Philadelphia chromosome on BCR/ABR fusion gene
- <20% blasts (myeloblasts, monoblast, or promonocyte)
- Dysplasia in >1 myeloid lines
Characterized by hypercellular marrow, erythrocytosis, granulocytosis, and thrombocytosis, myelofibrosis
CHRONIC MYELOPROLIFERATIVE DISORDERS
All may terminate in ACUTE LEUKEMIA
CHRONIC MYELOPROLIFERATIVE DISORDERS
Defect of the myeloid stem cell (named for the cell line most greatly affected)
CHRONIC MYELOPROLIFERATIVE DISORDERS
– gene that instructs protein production that
promotes cell growth and development
Janus kinase 2 (JAK2) oncogene
Molecular diagnostic studies (helpful) for this disorders
CHRONIC MYELOPROLIFERATIVE DISORDERS
Fusion gene
BCR/ABL oncogen
Conditions where JAK 2 is present
✓ Polycythemia vera
✓ Chronic idiopathic myelofibrosis
✓ Essential thrombocythemia
Conditions where BCR/ABL gene is present
✓ Chronic Myelogenous Leukemia
✓ Acute Lymphocytic Leukemia
Malignant hyperplasia of the multipotential myeloid stem cell causes increase in all cell lines; High blood viscosity
Hypercellular Marrow
- Malignant hyperplasia of the multipotential myeloid stem cell causes increase in all cell lines “pancytosis” (particularly RBCs → WBCs + Platelets)
- High blood viscosity
Polycythemia Vera
LAP in PV
Increased
Distinct gene for PV
JAK2 oncogene
ESR in PV
Probability of low ESR due to viscous blood
proliferation of granulocytes (granulocytosis)
Chronic Myelogenous Leukemia (CML)
Bone marrow has an increased M:E ratio (25:1)
CML
Blast crisis
CML
LAP in CML
Low
CML has this chromosome
Philadelphia chromosome t(9;22)
Proliferation of megakaryocytes
Essential Thrombocythemia (ET)
Platelets >1000 x 109/L (Giant forms, platelet function abnormalities)
Essential Thrombocythemia (ET)
Myeloid stem cell disorder characterized by proliferation of erythroid, granulocytic, and
megakaryocytic precursors in marrow with dyspoiesis
Chronic Idiopathic Myelofibrosis
Progressive marrow fibrosis (fibrin clots may accumulate causing blood vessel blockage → stroke,
heart attack
Chronic Idiopathic Myelofibrosis
Distinct cell found in Chronic Idiopathic Myelofibrosis
Teardrop cells (RBC)
Group of acquired clonal disorders affecting pluripotential stem cells
MYELODYSPLASTIC SYNDROMES (MSDs)
Progressive blood cytopenias, despite bone marrow hyperplasia
MYELODYSPLASTIC SYNDROMES (MSDs)
High incidence of terminating in acute myelogenous leukemia
MYELODYSPLASTIC SYNDROMES (MSDs)
MDS development is triggered by
chemotherapy, radiation, chemicals
WHO classification of MDS has an additional groups
Refractory cytopenia with multilineage dysplasia,
5q deletion syndrome
5 subgroups of MDS using the FAB classification scheme (up to 30% blasts in bone marrow)
RA
RARS
CMML
RAEB
RAEB-t
Anemia that is refractory (not responsive) to therapy
Refractory anemia (RA)
Refractory anemia (RA)
BM blasts:
PB blasts:
BM blasts: <5%
PB blasts: <1%
Ringed sideroblasts comprise >15% of bone marrow nucleated cells
Dimorphic erythrocytes
RARS
Leukocytosis
BM blasts: 5-20%
PB blast: <5%
Absolute monocytosis >1.0 x 109/L
CMML
BM blasts: 5-20%
PB blast: <5%
NO absolute monocytosis
RAEB
Trilineage (RBC, WBC, platelet) cytopenias
RAEB
WHO classification reassigns this MDS as an ACUTE LEUKEMIA
RAEB-t
RAEB-t
BM blasts:
PB blasts:
BM blasts: >20-<30%
PB blasts: >5%
ALL is differentiated based on morphology including:
- Cell size
- Prominence of nucleoli
- Amount and appearance of cytoplasm
CMML, RAEB
BM blasts:
PB blasts:
BM blasts: 5-20%
PB blasts: <5%
most common cancer in children, 23% of cancer diagnoses among children <15 years of age
ACUTE LYMPHOBLASTIC LEUKEMIA
results from the malignant transformation of normal developing T cells in the thymus, the so-called THYMOCYTES
T-cell acute Lymphoblastic leukemia (T-ALL)
Small homogenous lymphoblasts
Scanty cytoplasm, inconspicuous nucleoli
Round irregular/indistinct nucleus
ALL L1
Most common CHILDHOOD ALL with best prognosis
ALL L1
Large heterogenous lymphoblasts
Abundant basophilic cytoplasm
Clefted nuclei
Nucleoli present
ALL L2
WHO CLASSIFICATION OF ALL is based on
Phenotyping
Adult type ALL
ALL L2
Burkitt type ALL
L3
Large homogenous lymphoblast
VACUOLATED
Rarest
ALL L3
WHO classification of ALL
PRECURSOR B-CELL ALL
PRECURSOR T-CELL ALL
MATURE B-CELL ALL
ALL with poor prognosis
ALL L3
- 75% of cases occur in children <6 y/o
- 85% of ALL are this type
PRECURSOR B-CELL ALL
(+): enlarged lymph nodes, liver, spleen
* Leukocyte count: variable
* Lymphoblasts are pleomorphic and vary from small to large with nuclei having prominent or
inconspicuous nucleoli, compact or dispersed chromatin
* Blue or blue-gray cytoplasm is usually scant (but may be abundant)
* Coarse azurophilic granules may be present
PRECURSOR B-CELL ALL
Neoplasm of lymphoblasts committed to the B-cell lineage
PRECURSOR B-CELL ALL
under PRECURSOR B-CELL ALL
o Early Pre-B cell ALL
o Common ALL
o Pre-B cell ALL
- 15% of childhood ALL
- 25% of adult ALL
PRECURSOR T-CELL ALL
- Leukocyte count: often markedly elevated
- Lymphoblasts are similar to those in precursor B-cell ALL with a wide variation in morphology
PRECURSOR T-CELL ALL
Under PRECURSOR T-CELL ALL
o Early T cell ALL
o Intermediate T-ALL
o Mature T-ALL
Neoplasm of lymphoblasts committed to the T-cell lineage
PRECURSOR T-CELL ALL
expressed by specific cell lines at different maturation stages
Cluster differentiation (CD) markers
- B cell malignancy (CD19, CD20 positive)
- Smudge cells
- Small lymphocyte lymphoma – CLL lymphoma phase
Chronic Lymphocytic Leukemia (CLL)
CHRONIC LYMPHOPROLIFERATIVE DISORDERS
CLL
HCL
Prolymphocytic leukemia
- B cell malignancy (CD19, CD20 positive)
- Dry tap on bone marrow aspiration
- TRAP stain positive
Hairy Cell Leukemia (HCL)
- B cell (most common) or T cell malignancy
Prolymphocytic leukemia
Plasma cell neoplasms
MULTIPLE MYELOMA
WALDENSTROM MACROGLOBULINEMIA
Monoclonal gammopathy causes B cell production of excess IgG or IgA
MM
Identified on serum protein
electrophoresis by an “M” spike in the gamma globulin region
MM
- Bone tumors
- Increased blood viscosity
- Prolonged bleeding
- Bence Jones proteins (free light
chains-kappa or lambda)
MM
Monoclonal gammopathy causes B cell production of excess IgM (macroglobulin)
and decreased production of other
immunoglobulins
WALDENSTROM MACROGLOBULINEMIA
- Lymphadenopathy and
hepatosplenomegaly - No bone tumors
- Increased blood viscosity
WALDENSTROM MACROGLOBULINEMIA
T/F
WHO classification considers CLL and SLL (small lymphocytic leukemia) as one entity with different clinical presentations
T
CL L vs SLL
Diagnosis is based on the predominant site of involvement
CLL - peripheral blood (lymphocytosis, >10x109/L) and bone marrow involvement
SLL - lymph nodes and other lymphoid organs
Proliferation of malignant cells in solid lymphatic tissues
LYMPHOMAS
→ group of closely related disorders that are characterized by over proliferation of
one or more types of cells of the lymphoid system (lymphoreticular stem cells, lymphocytes,
reticular cells and histiocytes)
Lymphomas
→ includes various forms of leukemias and malignant lymphomas
that are of lymphoreticular origin.
Lymphoproliferative disorder
METHODS for lymphomas
Tissue biopsy,
CD4 marker identification,
Cytogenetics,
PCR
aka Classical Hodgkin Lymphoma, Nodular Lymphocyte Predominant Hodgkin Lymphoma
Hodgkin Lymphoma
Aneuploidy, or a deviation from the diploid no. of chromosomes
Gain of chromosomes 1, 2, 5, 12, and 21 is a recurring numerical abnormality
Hodgkin Lymphoma
Structural rearrangements involving chromosome 1 are frequently observed
Hodgkin Lymphoma
– Follicular lymphoma
– Multiple myeloma
– Chronic lymphocytic lymphoma
Low-grade/Indolent type NHL
– diffuse large B-cell lymphoma
– most frequent type of NHL
– Burkitt’s lymphoma
High-grade/Aggressive type NHL
40% of lymphomas
HODGKIN
3 different types of diffuse large B-cell lymphomas
- Germinal center, B-cell–like lymphoma
- Activated B-cell–like lymphoma
- Type 3 diffuse large B-cell lymphoma (NEW)
Affected lineage in HOGKIN
B-cell lineage
WHO classification of HODGKIN
Nodular sclerosis (70%)
Mixed cellularity (20%)
Lymphocyte rich
Lymphocyte depleted
Associated with EBV
HODGKIN
60% of lymphomas
HODGKIN
B cell neoplasms in NON HODGKIN
a) Mantle cell
b) Follicular
c) Burkitt
Skin itching, leading to ulcerative tumors
Sezary syndrome
CD2, CD3, CD4 (+)
MYCOSIS FUNGOIDES
(CUTANEOUS T CELL
LYMPHOMA)
leukemic phase of cutaneous T-cell lymphoma
Sezary Syndrome
typically the size of a small lymphocyte and has a dark-staining, clumped, nuclear chromatin pattern
Sézary cell
derived from mature or post thymic T cells
Mature T-Cell & NK-Cell Neoplasms
Used for cytochemistry studies
Fixatives containing alcohol (methanol or ethanol), acetone, formaldehyde
Leukocyte count reference value
3.4 – 9.7 X 109/L
Found in the central part of smear
Lymphocytes
Found in the edge part of the smear
Monocytes
Granulocytes