acute myeloid leukemia irit avivi. what is an acute myeloid leukemia ? accumulation of early myeloid...
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ACUTE MYELOID LEUKEMIA
Irit Avivi
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What is an Acute Myeloid Leukemia?
Accumulation of early myeloid progenitors (blast cells) in bone marrow and blood
Definition requests presence of 20% or more blasts in BM
Normally- less than 5%
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AML
Aggressive disease with an acute onset
Can occur De Novo
or
following a known leukomogemic trigger (radiation, chemotherapy, diseases) :
Secondary AML
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Leukemia
Malignant Transformation
Proliferation and Accumulation
Peripheral blood Blasts in BM Visceral organs Cytopenias
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Bone Marrow - Normal (low power)
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BM - Acute Leukemia (low power)
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BM - Normal (high power))
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Bone Marrow - acute leukemia (high power)Bone Marrow - acute leukemia (high power)
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Pathophysiology
Radiation chromosomal damage
Chemotherapy
Viruses Protooncogen
Inhibition/Enhancements of regulatory genes
Inhibition of suppressor genes
Enhancements of proliferation
t(8;21),M2t(15;17) M3Inv 16;M4e
Inhibition of apoptosis
Myeloid Stem Cell
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Epidemiology
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Predisposing factors
Environmental Benzen, herbicies
Chemotherapy :AK ; NU;PRC
Radiation
Acquired diseases Meyloproliferative(CML;PV..)
Aplastic anemia
Genetic Congenital abnormality
to repair DNA :
Down syndrome
Ashkenazi Jews >> orientals
Relatives(1st degree x3)
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Clinical symptoms of Acute Leukemia
Bone marrow expansion Bone pain
Bone marrow failure Leucopoenia infections
Thrombopenia bleeding
Anemia
Leucostasis >50,000 blasts Dispnea,
CNS
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Clinical symptoms
Extramedullary
) Chloroma(
Skin,
CNS
Gingiva Kidney
Kidney
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Extramedullary: Gingival hypertrophy
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Clinical symptoms
DIC Bleeding Thrombosis
Metabolic Hyperuricemia Tumor lyses syndrome
K
Lactic Acid
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Diagnosis> 20% blasts in bone marrow/peripheral blood(
AML ;blasts
BM
Normal bone marrow
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Acute leukemia - AUER Rods ( FAB;AML M3 )
AuerRods
Aggregation of granules
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Acute Lymphoblastic LeukemiaAcute Lymphoblastic Leukemia
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Acute promyelocytic leukemia - AML M3Acute promyelocytic leukemia - AML M3
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Myeloblasts - AMLMyeloblasts - AML
Auer rod
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AML M2 blasts
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French American British (FAB) classification
-Based on morphology and staining (cytochemistry)
-Divides patients into 7 AML subtypes
-A morphological rather than biological classification
-Correlation between morphological and biological characteristics may exist , but not always
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Cytochemistry Myeloblasts - myeloproxidase positive
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Diagnosis
Diagnosis :>20% blasts in BM Cytochemical stains :
ALL TdT +, MPO - AML TdT -, MPO+
Classified into subgroups based on cell surface markers and cytogenetics
B cells T cells
19
22
20
22
3
3
5
7
Myeloblast
15
13
13
33
FACS
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Diagnosis : Karyotype, cytogenetics
chromosomal abnormalities: M3
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AML M2
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Chromosomal abnormalities (cytogenetics)
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Prognosis Risk factors
CytogenticsFlt-3 mutation
Age
White blood cell count at presentation
FAB classification
De-novo /secondary
Response to first course of chemotherapy
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Cytogenetic Classification
FavorableFavorable
IntermediateIntermediate
SWOGSWOG
UnfavorableUnfavorable
UnknownUnknown
MRC ; As for SWOG, MRC ; As for SWOG, except:-except:-t(15;17)t(15;17)
Inv(16)Inv(16)t(8;21)-t(8;21)-
t(8;21) –– other abnormalityt(8;21) –– other abnormality
+8 +8
normal karyotypenormal karyotype
11q2311q23del(9q), del(7q) –– alonedel(9q), del(7q) –– alone
Complex karyotypes (> 3 abn, butComplex karyotypes (> 3 abn, but > 5 abn)> 5 abn)All abnormalities of unknownAll abnormalities of unknownprognostic significanceprognostic significance
All other clonal chromosomal All other clonal chromosomal aberrations with less than 3 abnaberrations with less than 3 abn
-5/del(5q), -7/del(7q),-5/del(5q), -7/del(7q),inv(3q), 11q23, 20q,inv(3q), 11q23, 20q,21q, del(9q), t(6;9)21q, del(9q), t(6;9)t(9;22), 17p,t(9;22), 17p,
Complex (> 3 abn)Complex (> 3 abn) Complex karyotypes (> 5 abn)Complex karyotypes (> 5 abn)
+_
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0
50
25
75
100
0 1
Ove
rall
Su
rviv
al (
%)
Ove
rall
Su
rviv
al (
%)
YearsYears 2 3 4 5
67%67%64%64%62%62%
41%41%
15%15%11%11%
Favorable n=377 Favorable n=377
Intermediate n=1,072Intermediate n=1,072
Adverse n=163Adverse n=163
D. Grimwade, et al, Blood, 1998
Cytogenetic and prognosis
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Treatment
0
10
20
30
40
50
1970-74 1975-79 1980-84 1985-89 1990-94 1995-99
% S
till
Aliv
e
Years
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Treatment of acute leukemia (I)Supportive care:
Hydration
Allopurinol to prevent hyperuricemia
Cytopharesis
Blood products
Patient workup :
History for occupational exposure or exposure
Bone marrow aspiration and biopsy
Bone marrow sample for cytogenetic, FACS, PCR
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Treatment in the Younger AML Patient>60yrs
Course I of chemotherapy INDUCTION
IntensiveChemotherapy
AllogeneicStem Cell
Transplantation
AutologousStem Cell
Transplantation
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Outcome at 5 years
Allo Chemotherapy
Relapse 20-30% 40-60%
Overall survival 50% 50%
TRM 20-30% 5%
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So how to choose which therapy to a specific patient?
use the prognostic factors to estimate relapse rate and survival
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00%
20%
40%
Unfavorable CytogeneticsS
urv
iva
lS
urv
iva
l
80%
60%
100%
2 4 6Slovak M., et al, Blood, 2000
8
Allogeneic BMTAllogeneic BMT
Autologous BMTAutologous BMT
ChemotherapyChemotherapy
44%44%
15%15%
YearsYears
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What is the best treatment?Who should have a matched related Allo
SCT?
Who should have an
Auto SCT?
Patients with poor risk
and standard risk younger than 35/40 years in CR1
Patients in CR2 or beyond
Favourable/standard risk patients who relapsed, responded again to chemotherapy and have no matched donor
Patients in CR1?
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AML in Elderly patients(>60 years)
The majority of the patients are older than 60
Lower remission rate
Higher treatment –related morbidity & mortality
Very poor outcome
higher frequency of poor risk cytogenetics & resistance to chemotherapy
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Future directionsIdentify new prognostic factors
New therapies : Modulation of drug resistance
Biological, specific treatments:
Monoclonal antibodies
ATRA in APL, t (15;17)
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Summary
The majority of patients still die of their disease (significantly poor outcome in elderly patients)
Further improvement is needed:
Better ability to predict patients outcome
Tailoring treatment to patient’s risk factors
Improving therapy & supportive care
New strategies for elderly patients
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Suggested Reading
Hoffbrand Hematology
Williams Hematology
Harrison’s Text book of Internal Medicine
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