leukemias
DESCRIPTION
acute leukemias for undergraduatesTRANSCRIPT
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LEUKEMIAS
Dr SAPNA M
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Leukemoid Reaction• A leukemoid reaction describes a high
WBC count with neutrophilia,usually in
response to infection.• The WBC count may be as high as 50,000
/microL and can easily mimic CML or
AML.
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• Serum leukocyte alkaline phosphatase is normal or elevated in leukemoid reaction, but is depressed in chronic myelogenous leukemia.
• The bone marrow in a leukemoid reaction, if examined, may be hypercellular but is otherwise typically unremarkable.
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Features Suggesting Leukemoid Reaction
• Toxic granulation.• High LAP score.• Presence of an obvious cause for the
neutrophilia.
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• As noted above, a leukemoid reaction is typically a response to an underlying medical issue. Causes of leukemoid reactions include:• Hemorrhage• Drugs
– Use of Sulfa drugs– Use of Dapsone– Use of glucocorticoids– Use of G-CSF or related growth factors– All-trans retinoic acid (ATRA)
• Infections – Clostridium difficile– Tuberculosis– Pertussis– Infectious mononucleosis (lymphocyte predominant)– Visceral Larva Migrans (eosinophil predominant)
• Asplenia• Diabetic ketoacidosis• Organ necrosis
– Hepatic necrosis– Ischemic colitis
• As a feature of Trisomy 21 in infancy (incidence of ~10%)• As a paraneoplastic phenomenon (rare)
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Leukemoid reaction
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LAP score
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What is leukemia?
Leukemia is cancer of the white blood cells. White blood cells help your body fight infection. Your blood cells form in your bone marrow. In leukemia, however, the bone marrow produces abnormal white blood cells. These cells crowd out the healthy blood cells, making it hard for blood to do its work.
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Hematopoieticstem cell
Neutrophils
Eosinophils
Basophils
Monocytes
Platelets
Red cells
Myeloidprogenitor
Lymphoidprogenitor
B-lymphocytes
T-lymphocytes
Plasmacells
naïve
ALL
AML
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Myeloid maturation
myeloblast
promyelocytemyelocytemetamyelocyte band neutrophil
MATURATION
Adapted and modified from U Va website
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Definition • Leukemia: is a cancer of the blood or bone marrow
characterized by abnormal proliferation of blood cells,usually WBCs(Leukocytes).
• Acute leukemia: rapid increase of immature blood cells.
• Chronic leukemia: excessive build up of relatively mature,but still abnormal blood cells.
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About the Disease
• Leukemia, lymphoma and myeloma are cancers that originate in the bone marrow (leukemia & myeloma) or in lymphatic tissues (lymphoma).
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Different Types of Blood Cancers
• Leukemia• Non-Hodgkin Lymphoma• Hodgkin Lymphoma• Myeloma• Myelodysplastic Syndromes
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What is Leukemia
• Greek word which means “white blood”• Leukemia is when cells spread rapidly and destroy living
tissue.• It grows/invades the bone marrow which is the factory of
blood and replaces normal blood elements with cancer cells.
• Cancer cells replace all bone marrow cells which causes infection and bleeding problems.
• Leukemia is basically white blood cells that don’t work well and cause trouble.
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Signs and Symptoms• Most of the signs and symptoms are due to: 1-Anemia. 2-Leukopenia. 3-Thrombocytopenia.• Bicytopenia,Pancytopenia.• All symptoms associated with leukemia can be attributed to other diseases, consequently,leukemia is always diagnosed by laboratory investigations.
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Causes• Leukemia,like other malignancies, results from somatic mutations in the DNA.• Certain mutations produce leukemia by activating oncogenes or deactivating tumor suppressor genes.• These mutations may occur spontaneously or as a result of exposure to radiation or carcinogenic substances,and likely to be influenced by genetic factors.
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Causes-cont’d• Ionizing radiation• Viruses: Human T-lymphotropic virus (HTLV-1)• Chemicals: Benzene,chemotherapy.• Smoking: slight increase in leukemia
incidence.• Genetic predisposition toward developing
leukemia: Down syn.,Fanconi anemia
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Classification• Multiple classification systems.• FAB classification:
French-American-British Classification.• FAB Classification relies on morphologic,
cytochemical,and immunophenotyping
criteria to define 8 major subtypes
(M0-M7)
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FAB vs WHO Classification• French-American-British (FAB) Cx
– Cellular morphology and cytochemical stain– Acute leukemia as > 30% bone marrow blasts– Widely used
• World Health Organization Cx– Cellular morphology and cytochemical stain– Immunologic probes of cell markers, cytogenetics,
molecular abnormalities & clinical syndrome– Acute leukemia as > 20% bone marrow blasts– Standard for diagnosis
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Acute myeloid leukemias (AML) Classification - FAB
1. M0: minimally differentiated
2. M1: myeloblastic leukemia without maturation
3. M2: myeloblastic leukemia with maturation
4. M3: hypergranular promyelocytic leukemia
5. M4: myelomonocytic leukemia
6. M4Eo: variant, increase in marrow eosinophils
7. M5: monocytic leukemia
8. M6: erythroleukemia (DiGuglielmo's disease)
9. M7: megakaryoblastic leukemia
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AML classification - WHO
AML not otherwise categorized1. AML minimally differentiated2. AML without maturation3. AML with maturation4. Acute myelomonocytic leukemia5. Acute monocytic leukemia6. Acute erythroid leukemia7. Acute megakaryocytic leukemia8. Acute basophilic leukemia9. Acute panmyelosis with myelofibrosis
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Acute vs Chronic Leukemia
Acute Chronic
Age Children & young adults
Middle age and elderly
Onset Sudden insidious
Duration weeks to months years
WBC count Variable High
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Acute vs Chronic Leukemia
Acute Chronic
Platelets Low Early: Normal/ HighLate: Low
Anemia High (>90%) None/ mild
Predomi-nant cells
Blast cells Mature cells
AML = myeloblastALL= lymphoblast
CML=granulocytesCLL=lymphocytes
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Acute vs Chronic Leukemia
Acute Chronic
Marrow cellularity
>20% marrow blasts (WHO)> 30% marrow blasts (FAB)
>70% marrow cellularity (hypercellular); No dysplasia
Diagnosis PBS, BM exam, cytochemical stains, surface markers, EM,chromosome
PBS (peripheral blood smear)
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Acute Myeloid Leukemia
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Definition• Acute myeloid leukemia (AML): acute
myelogenous leukemia,acute non-
lymphocytic leukemia.• AML consists of a group of relatively well-
defined hematopoietic neoplasms
involving precursor cells commited
to the myeloid line(WBCs,RBCs,PLTs)
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Chracteristics• AML is characterized by a clonal proli- feration of myeloid precursors with a reduced capacity to differentiate into mature cellular elements.• As a result,there is an accumulation of leukemic blasts or other immature forms in the BM,peripheral blood,and other tissues with a variable reduction in the production of normal RBCs,platelets, and mature granulocytes.
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Specific:• M2 : Chloroma:-presents as a mass lesion
‘tumor of leukemic cells’ • M3 : DIC• M4/M5 : Infiltration of soft tissues,
gum infiltration, skin deposits ,Meningeal involvement-headache, vomiting, eye symptoms
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A
B
C
Chloromas
NEJM 1998
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Gum hypertrophy
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Leukostasis
• accumulation of blasts in microcirculation with impaired perfusion
• lungs: hypoxemia, pulmonary infiltrates
• CNS: stroke• only seen with WBC >> 50 x 109/L
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Pathological Features• CBC and differential.• Blood film (smear).• Bone marrow examination: BM aspirate
and trephine biopsy.
1-Morphology.
2-Immunephenotyping.
3-Cytogenetics and molecular biology.
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Jemshidi trephine & Salah aspiration needle
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Bone marrow in acute leukemia
• necessary for diagnosis• useful for determining type• useful for prognosis• Acute leukemias are defined by the
presence of > 20% blasts in bone marrow (% of nucleated marrow cells)
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• Bone marrow aspirate & trephine: Hypercellular, –blast cells ( > 20%), –presence of Auer rods - AML type
• Cytochemistry : Special stains to differentiate AML from ALL ; Positivity with Sudan black & Myeloperoxidase (MPO) in AML
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WBC Count in AML• WBC count in AML can be high,normal,or
low.• Median WBC count in AML is 15 000/uL.• 20% of patients have > 100 000/uL• 25-40% of patients have <5000/uL• 95% of patients have blast cells on blood
film.
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Distinguishing AML from ALL
• light microscopy– AML: Auer rods, cytoplasmic granules– ALL: no Auer rods or granules.
• flow cytometry• special stains (cytochemistry)
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Cytochemical Stains
• Since the early 20th century, cytochemical staining of cells has been a useful tool in differentiating hematopoietic diseases.
• Smears and imprints made from bone marrow, lymph nodes, spleen, or peripheral blood are preferred.– In enzymatic techniques, fresh smears are used to
ensure optimal enzyme activity
• Certain elements may be inhibited during the fixation of smears and imprints
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Myeloperoxidase (MPX/MPO)• The proxidase enzyme reacts with H2O2 & release O2,
which oxidizes the indicator dye and produce orange-brown granules in the cells (3-amino-9-erythrocarbazol)
• Enzyme MPX is found in the 1o granules of granulocytes, neutrophils and precursors (from the promyelocyte stage on) & eosinophils
• Monocytes may be weakly pos
• Leukemic myeloblasts are usually pos and Auer rods stain very strongly
• Used for differentiating AML (+) from ALL (-)
• Normal bone marrow smear <5 days old used for control slides (promyelocyte - neutrophils)
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MPO (right) & Sudan black (left) showing intense localised positivity in blasts
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Myeloperoxidase
(MPO)
p-Phenylene diamine + Catecol + H2O2
MPO > Brown black deposits
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Chloracetate (Specific) Esterase
Myeloid Cell Line
Naphthol-ASD-chloracetate CAE > Free naphthol compounds
+ Stable diazonium salt (eg, Fast Corinth) > Red deposit
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Non-Specific Esterase (NSE)• Nonspecific esterase liberates alpha-naphthyl from
the substrate alpha-naphthyl acetate. Alpha-naphthyl is couples with the dye molecule to form dark reddish-brown granules
• Monocytes, monblasts, macrophages, histiocytes, megakaryocytes and some carcinomas are NSE pos
• Abnormal erythroblasts are strongly pos
• Lymphocytes are neg or may show dot positivity
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Non-Specific Esterase
Monocytic Line
Naphthyl acetate ANAE > Free naphthyl compounds +Stable diazonium salt (eg, Fast blue RR) > Brown deposits
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NSE continued
• Used for differentiating myelomonocytic and monocytic leukemia (+) from granulocytic leukemia (-)
• Monocyte NSE are fluoride sensitive
• Peripheral smear with appreciable # of monocytes or a normal BM smear used for control slides
http://www.healthsystem.virginia.edu/internet/hematology/hessedd/malignanthematologicdisorders/leukemias/aml-m4.cfm
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Double Esterase in M4
NSE with Fl inhibition
Histiocyte
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Periodic Acid Schiff (PAS)• Periodic acid oxidizes glycogen, mucoproteins, and
other high-molecular weight carbohydrates to aldehydes.
• Aldehydes react with colorless Schiff reagent, staining them a bright red-pink
• Megakaryocytes and platelets stain strongly pos
• Normoblasts will stain Pos
• Lymphoblasts in ALL show course and granular (block) positivity
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PAS Continued
• Myeloblasts are Neg
• Aids in diagnosis of ALL, erythroleukemia, and megakaryoblastic leukemia
• Normal bone marrow smear used for control slides
http://www.pathologyoutlines.com/leukemia.html
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Periodic Acid Schiff
Periodic acid + Glycogen oxidation > Aldehyde + Schiff reagent
(para-rosaniline, Na metabisulfite) > Red deposit
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AML
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AML
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Auer rods in AML
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ALL
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P. Smear AML
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MO: Minimally differentiated
• Undifferentiated Blasts (No maturation)
• Myeloid phenotype - CD13, CD33, CD34
• (-) SBB, MPO• Negative: Auer rods,
Esterase
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M1 AML without maturation
> 30% myeloblasts Large cells, round nucleus Nucleoli (+) scanty cytoplasm >3% MPO, SBB (+) <20% NSE (+) CD 13, 33, 117
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M1 AML without maturation
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M2 AML with maturation
• Common type• >30% myeloblasts• >10% granulocyte• Kidney shape nucleus• Nucleoli (+)• (+) Auer rods • Eosinophilic granules• >50% MPO, SBB (+)• CD 13, 33
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M2 AML with maturation
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Auer Rods
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M3 (hypergranular promyelocytic)
• Promyelocyte-predominant • Large, kidney shape • (+) Auer rods (faggot cells) • basophilic, bilobed nuclei• CD 13,33• High incidence of DIC
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Acute myeloid leukemia with very abnormal cells (AML M3/ t15;17)
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M4 Acute myelomonocytic
• >30% myeloblast (FAB)• >20% granulocyte• >20% promonocytes and
monocytes• CD 11, 13, 33,14• (+) Auer rods common• High serum lysozyme level
– M4Eo = w/ eosinophilia
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M3
M5
M4
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M5: acute monocytic leukemia
1. M5a – without maturation– Monoblasts , few promonocytes
2. M5b – with maturation – Blast, Promonocytes (BM), Monocytes
(Blood)
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M5a
• Monoblast ameboid with round to oval nuclei,
• prominent nucleoli, • <20% promonocytes/mono• Vacuolated cytoplasm
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AML M5a
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M5b
• > 20% promonocytes, monocytes
• Promonocytes folded, convulated nucleus
• Azurophilic granules
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AML M5b
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M6 - erythroleukemia
Large, bizarre,round-to-oval cells
(+) nucleoli > 50% Erythroblasts > 30 % Myeloblasts CD 45,71 Glycophorin A CD 13, 15,33 myeloblast PAS (+)
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M6 (erythroblast)
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M6 (erythroblast)
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M7 – acute megakaryoblastic
• >30% megakaryoblasts• platelet like granules on
PAS stain• NSE (but not BE) (+) • Myeloid blasts may show
SBB or MPO (+) • CD 41,42,61
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M7 (Megakaryoblast)
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Megakaryoblast
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Acute Nonlymphocytic Leukemias
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• Acute lymphoblastic leukemias
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FAB Classification of ALL
L1: Small homogeneous blasts; mostly in children
L2: Large heterogeneous blasts; mostly in adults
L3: “Burkitt” large basophilic B-cell blasts with vacuoles
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WHO Classification of Lymphoproliferative Syndromes
Precursor B Lymphoblastic Leukemia/Lymphoma (ALL/LBL) -- ALL in children (80-85% of childhood ALL); LBL in young adults and rare; FAB L1 or L2 blast morphology
Precursor T ALL/LBL -- 15% of childhood ALL and 25% of adult ALL
Burkitt Leukemia/Lymphoma (FAB L3)
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• Confirmation:– Immunophenotyping–Molecular genetics–Cytogenetics: Chromosomal abnormalities
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ALL L1
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L3L2
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Burkits / ALL L3
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Prognostic factors
• High WBC – relapse in testis /cns• Infants <1 yr, children >10 yr poor outcome• L1- good prognosis• L2,3- bad prognosis
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Prognosis• The response to treatment and overall survival of patients with AML are heterogenous.• Prognostic factors are related to patient and tumor characteristics: 1-Age 2-Performance status 3- Karyotype
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Adverse Clinical Predictors
• Advanced age.• Poor performance status.• History of exposure to cytostatic agents or
radiotherapy.(Therapy-related AML).• History of MDS or other hematological
diseases
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THANK YOU