x:vimsupdates 6aprilnew iap ug teacing module … · 73%, acute myeloid leukemia (aml) accounts for...
TRANSCRIPT
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IAP UG Teaching slides 2015‐16
LEUKEMIA
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IAP UG Teaching slides 2015‐16
INTRODUCTION
Leukemias are the most common cancers affecting children.
Acute lymphoblastic leukemia (ALL) accounts for 73%, acute myeloid leukemia (AML) accounts for approximately 18%.
Chronic myeloid leukemia(CML) is rarely seen, accounting for less than 4%.
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IAP UG Teaching slides 2015‐16
EPIDEMIOLOGY
ALL: 3–4 cases per 100,000 white children
Peak incidence between 2 and 5 years of age
Accounts for 25–30% of all childhood cancers
In ALL, boys are more commonly affected than girls
The incidence of AML is similar for all paediatric age groups
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IAP UG Teaching slides 2015‐16
INCREASED RISK WITH
Ionizing radiation
Chemicals (e.g., benzene in AML)
Drugs (e.g., use of alkylating agents either alone or in
combination with radiation therapy increases the risk of AML)
Trisomy 21 (Down syndrome)
Bloom syndrome
Fanconi anaemia
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IAP UG Teaching slides 2015‐16
INCREASED RISK WITH..
Congenital agammaglobulinemia Poland syndrome Shwachman–Diamond syndrome Ataxia telangiectasia Li–Fraumeni syndrome Neurofibromatosis Diamond–Blackfan anaemia Kostmann disease Bloom syndrome
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Acute leukemia is characterized by clonal
expansion of immature hematopoietic or
lymphoid precursors.
Chronic leukemia refers to conditions
characterized by the expansion of mature
marrow elements
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IAP UG Teaching slides 2015‐16 7
CLINICAL MANIFESTATIONS
General Systemic Effects 1. Fever (60%). 2. Lassitude (50%). 3. Pallor (40%).
Hematologic Effects Arising from Bone Marrow Invasion
1. Anaemia – causing pallor, fatigability, tachycardia, dyspnoea and sometimes congestive heart failure.
2. Neutropenia – causing fever, ulceration of buccal mucosa and infection.
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CLINICAL FEATURES
3. Thrombocytopenia – causing petechial, purpura, easy
bruisability, bleeding from mucous membrane and sometimes
internal bleeding (e.g., intracranial haemorrhage).
Clinical Manifestations Arising from Lymphoid
System Infiltration
1. Lymphadenopathy
2. Splenomegaly.
3. Hepatomegaly.
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IAP UG Teaching slides 2015‐16
CLINICAL FEATURES
Clinical Manifestations of Extramedullary Invasion
CNS‐ ICT symptoms, seizures
Genitourinary‐painless testicular swelling
Bone joints‐ bone pain
Skin‐bleeds
Git‐ bleeds
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IAP UG Teaching slides 2015‐16
CLASSIFICATION
Light microscopy –morphology L1,L2,L3
Cytochemistry ‐ staining‐MPO,ESTERASE
Immunophenotyping – cd numbering
Cytogenetics ‐ chromosome/gene rearrangement
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IAP UG Teaching slides 2015‐16
CytologicFeatures
L1 L2 L3
Cell size Small cells predominate
Large, heterogeneous in size
Large andheterogeneous
Nuclearchromatin
Homogeneous Variable, heterogeneous
Finely stippled andhomogeneous
Nuclear shape Regular, occasional cleftingor indentation
Irregular, clefting and indentation common
Regular, oval to round
Nucleoli Not visible, or small andinconspicuous
One or more present,often large
Prominent, one ormore vesicular
Amount ofcytoplasm
Scanty Variable, often moderatelyabundant
Moderately abundant
Basophilia ofcytoplasm
Slight or moderate, rarelyintense
Variable, deep in some
Very deep
Cytoplasmicvacuolation
Variable Variable Often prominent11
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FAB types of acute lymphoblastic leukemia (ALL). (A)L1 morphology with uniform‐sized blasts. (B) L2 ALL with more blast cell variation. (C) L3 blasts with more clumped nuclear chromatin, nucleoli, basophilic cytoplasm, and cytoplasmic vacuoles.
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CYTOCHEMISTRY
Myleoperoxidase and esterase can be positive in AML.
Generally, when morphologic classification is difficult,
these histochemical tests are of little help
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IAP UG Teaching slides 2015‐16
IMMUNOPHENOTYPING
B‐ALLs are arrested at various stages of pre‐B cell development. The lymphoblasts usually express the pan B‐cell marker CD19 as well as CD10.
Similarly, T‐ALLs are arrested at various stages of pre‐T cell development. In most cases the cells are positive for CD2, CD5, and CD7.
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IAP UG Teaching slides 2015‐16
CYTOGENETICS
Tel–AML1 fusion gene t(12;21) (p13q22‐excellent
prognosis
BCR–ABL fusion gene t(9;22) (q34q11).‐poor prognosis
MLL gene rearrangement‐poor prognosis
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IAP UG Teaching slides 2015‐16
INVESTIGATION AND TREATMENT
Blood count
Haemoglobin: Moderate to marked reduction
White blood cell count: Low, normal, or increased
Thrombocytopenia: 92% of patients have platelet
counts below normal
Blood smear: Blasts are present on blood smear. Very
few to none (in patients with leukopenia).
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IAP UG Teaching slides 2015‐16
BONE MARROW
Leukemia must be suspected when the bone marrow
contains more than 5% blasts.
The hallmark of the diagnosis of acute leukemia is the
blast cell, are relatively undifferentiated cell with
diffusely distributed nuclear chromatin, one or more
nucleoli and basophilic cytoplasm.
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A, Acute lymphoblastic leukemia with CD 22,19,10 positivity
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INVESTIGATIONS
Chest radiograph: Mediastinal mass in T‐cell leukemia.
Blood chemistry: Electrolytes, blood urea, uric acid,
liver function tests, Immuno globulin levels.
Cerebrospinal fluid: Chemistry and cells. Cerebrospinal
fluid findings for the diagnosis of CNS leukemia require:
Presence of more than 5 WBCs/mm3
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IAP UG Teaching slides 2015‐16
CNS LEUKEMIA
CNS involvement in leukemia is classified as follows:
CNS1 ,5 WBCs/mm3, no blasts on cytocentrifuge slide
CNS2 ,5 WBCs/mm3, blasts on cytocentrifuge slide
CNS3 .5 WBCs/mm3, blasts on cytocentrifuge slide
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IAP UG Teaching slides 2015‐16
INVESTIGATION
Coagulation profile: Decreased coagulation factors that
frequently occur with AML are: hypofibrinogenemia, factors V,
IX and X.
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IAP UG Teaching slides 2015‐16
TREATMENT
In general, treatment regimens for children with newly
diagnosed ALL include three phases: remission induction,
consolidation (or intensification), and continuation (or
maintenance).
Protocol adopted depends on the institution
Modified BFM or COG protocol is often the choice
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IAP UG Teaching slides 2015‐16
INDUCTION
Prednisolone 60 mg/m2/day
Inj.VCR 1.5mg2/day
Inj DNR 30 mg/m2
L ASPARGINASE 10000u/m2
MTX I/T
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INTENSIFICATION & CNS PROPHYLAXIS
Inj CYCLOPHOSPHAMIDE 1gm/m2
Inj CYTARABINE 75mg/m2/day
6 MP 60 mg/m2/d
I/T MTX
CRANIAL IRRADIATION
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MAINTENANCE
Inj. VCR 1.5 mg/m2 one in a month
Tab PREDNISOLONE 60 mg/m2 for one wk
T.6MP 50 mg/m2 p.o daily
T.MTX 20 mg/m2 p.o wkly
The optimal duration of therapy remains unknown. Most investigators
continue to treat patients for 2 to 3 years, based on results of older studies
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IAP UG Teaching slides 2015‐16
SUPPORTIVE CARE
A total of 10 mg/kg/day of allopurinol in divided doses is
given in all cases before the commencement of
antileukemic drugs.
When the blast cell count is more than 50,000/mm3 or
there are large tumour masses, allopurinol is obligatory,
together with a fluid intake of 2–3 L/m2/day
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IAP UG Teaching slides 2015‐16
SUPPORTIVE TREATMENT
Supportive care including the use of packed red cells
When high fever and possible septicemia occur in the
presence of neutropenia, antibiotic therapy should be
started after taking appropriate blood cultures and a
chest radiograph.(NEUTROPENIA REGIME)
Platelet transfusions should be administered to patients
with overt bleeding or when the platelet count is below
10,000/mm3.
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IAP UG Teaching slides 2015‐16
REMISSION
Minimal Residual Disease and its Implication in the
Management of Leukemia
MRD detection are now used as prognostic markers after
induction.
Patients with .0.01% leukemic cells after the end of
induction have a worse prognosis and may require more
intensive therapy.
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RISK STRATIFICATIONFactor Favourable Intermediate Unfavourable
Age (years) 1–9 >/=10 <1 and MLL1
White blood cellcount 10 9/L
<50 >50
Immunophenotype Precursor B cell T cell
Genetics Hyperdiploidy .50 chromosomes orDNA index .1.16 ,Trisomies 4,10 and 17 , t(12;21)/ETV6‐CBFA2
Diploid,t(1;19)/TCF3‐PBX
t(9;22)/BCR‐ABL1, t(4:11)/MLL‐AF4, Hypodiploid ,44chromosomes
CNS status CNS1 CNS2 CNS3
MRD (end ofinduction)
<0.01% 0.01% to 0 99%
>or=1%29
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D/DITP‐
ITP is the most common cause of the acute onset of
petechial and purpura in children. Patients with ITP usually
present with isolated thrombocytopenia,well child with no
lymph node enlargement or spenomegaly usually
Aplastic Anaemia
Pancytopenia with no organ enlargement
Juvenile Rheumatoid Arthritis
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IAP UG Teaching slides 2015‐16
Infectious Mononucleosis
The atypical lymphocytes observed with acute Epstein‐Barr
virus (EBV) and other viral infections can sometimes be
confused with peripheral leukemic blasts because they are
larger than normal lymphocytes.
Metastatic Solid Tumors
Children with neuroblastoma frequently have malignant
involvement of liver, lymph nodes, bone, or bone marrow;
the marrow involvement may be extensive
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RELAPSE
Bone Marrow Relapse in Children with ALL
Despite current intensive front‐line treatments, 20% of
children with ALL experience bone marrow relapse.
Relapse may be an isolated event in the bone marrow or
may be combined with relapse in other sites
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IAP UG Teaching slides 2015‐16
RELAPSE
Isolated Extramedullary Relapses
Isolated extramedullary relapses, occurring either in the
CNS or testis, are less frequent than marrow relapses in
ALL.
Such relapse may not actually be isolated
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AML
Number of risk factors have been identified, including
ionizing radiation, chemotherapeutic agents (e.g.,
alkylating agents,), organic solvents, paroxysmal nocturnal
hemoglobinuria
Down syndrome, Fanconi anaemia, Bloom syndrome,
Kostmann syndrome, Shwachman‐Diamond syndrome,
Diamond‐Blackfan syndrome, Li‐Fraumeni syndrome, and
neurofibromatosis type 1.
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DEFINITION
The World Health Organization (WHO) classification of AML defines that 20% blasts are required for the diagnosis of AML
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CLASSIFICATION
M0 ‐ Acute myeloblastic leukemia without differentiation
M1 ‐ Acute myeloblastic leukemia without maturation
M2 ‐ Acute myeloblastic leukemia with maturation M3 ‐ Acute promyeloblastic leukemia M4 ‐ Acute myelomonocytic leukemia M5 ‐ Acute monocytic leukemia M6 ‐ Erythroleukemia M7 ‐ Acute megakaryocytic leukemia
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CLINICAL FEATURES
Anaemia, thrombocytopenia ,leucopenia
Subcutaneous nodules or “blueberry muffin” lesions (especially in infants), infiltration of the gingiva (especially in M4 and M5 subtypes)
Signs and laboratory findings of disseminated intravascular coagulation (especially indicative of acute promyelocytic leukemia
Discrete masses, known as chloromas or granulocytic sarcomas, typically are associated with the M2 subcategory of AML with a t(8;21) translocation.
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(A)Minimally differentiated acute myeloid leukemia(FAB M0). (B) Acute myeloid leukemia without maturation (FAB M1). (C) Acute myeloid leukemia with maturation (FAB M2). There are at least 10% of cells showing maturation. (Inset) The blasts are myeloperoxidase‐positive by cytochemistry
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DIAGNOSIS & TREATMENT
Bone marrow aspiration and biopsy specimens of
patients with AML typically reveals the features of a
hypercellular marrow consisting of a monotonous
pattern of cells with features that permit FAB
subclassification of disease.
Flow cytometry and special stains assist in identifying
myeloperoxidase‐containing cells
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TREATMENT
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AML‐protocol (Modified from MRC 12)
Daunorubicin 50 mg/m2 IV days 1, 3, 5
Cytosine arabinoside 100 mg/m2 IV bolus every 12
hours days 1 to 10 (20 doses)
Etoposide 100 mg/m2 IV 1 hour infusion days 1 to 5
Intrathecal cytarabine age adjusted doses at time of
diagnostic LP
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TREATMENT
Acute promyelocytic leukemia (FAB‐M3), characterized by a
gene rearrangement involving the retinoic acid receptor
[t(15;17); PML‐RARA], is very responsive to all‐trans‐retinoic
acid (tretinoin) combined with anthracyclines and cytarabine.
The success of this therapy makes marrow transplantation in
first remission unnecessary for patients with this disease
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IAP UG Teaching slides 2015‐16
JMML
JMML is a rare, clonal, myeloproliferative disorder of the
stem cell that usually manifests in the first few years of
life.
It has also been referred to as juvenile chronic
myelomonocytic leukemia (JCML), infantile monosomy 7
syndrome, or juvenile granulocytic leukemia
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IAP UG Teaching slides 2015‐16
CLINICAL FEATURES
The most common symptoms are fever, cough, infection,
pallor, malaise, hepatosplenomegaly, lymphadenopathy,
rash, bleeding, and failure to thrive.
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IAP UG Teaching slides 2015‐16
Several treatment regimens have been used to improve
survival, including low‐dose chemotherapy, intensive AML‐
type therapy, and 13‐cis‐retinoic acid.
The only known curative therapy for JMML is allogeneic
HSCT, and neither pre‐treatment chemotherapy nor
splenectomy has not been found to impact survival.
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IAP UG Teaching slides 2015‐16
Thank You
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