Week 5 Flashcards

1
Q

What is leukemia

A

white blood
orginate in BM
can infiltrate lymphoid tissues
-replacement of bone marrow or lymph nodes with proliferating WBC
-can be chronic, acute, myeloid or lymphoid

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2
Q

What is lymphoma

A

-neoplasm of lymphoid tissue originating in reticuloendothelial and lymphatic systems - malignant
-can circulate in peripheral cells

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3
Q

Where do leukocyte neoplasms come from

A

-most are acquired genetic diseases
-systemic not localized single cell goes into the blood stream and travel anywhere
-mutations that occur during DNA replication or altered expression of genes
-origin of leukemia is related to mutation or altered expression of genes that escape correction process

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4
Q

What are some HOST factors that increase the chances of developing neoplasms

risk factors

A

Congenital Chromosomal Abnormalities -Downs, Turners, Klinefelters a 10-20x increase with Downs in acute leukemia extra gene interfere with gene processes

Chronic Marrow Dysfunction = becomes acute leukemia

Immunodeficiency - inherited form becomes lymphoid leukemia, defected DNA processes

Previous treatment like chemo- induces DNA damage that can later lead to neoplasms

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5
Q

What are some ENVIRONMENTAL factors that increase the chances of developing leukocyte neoplasms

A

Ionizing radiation - xray, gamma rays can cause DNA breaks also UV light

Chemicals and drugs - mutagens that cause increased rate of mutation like benzene, alkylating agents - mustard gas, oxidative products, dioxin , nitrous acid

Viruses- Epstein Barr = Burkitt Non Hodgkin lymphoma
HTLV-1 = adult T cell leukemia/lymphoma
-virus coded proteins prevent apoptosis

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6
Q

What genetic factors can cause leukemia

A

-chromosomal translocations in hematopoietic cells can cause Acute leukemia

t(9,22) for CML
t(8, 14) in Burkitt lymphoma

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7
Q

Proto- oncogene vs oncogene

A

Proto-oncogene normal = protein in normal cell regulation; cell division and maturation

Oncogene -mutated form
Most chromosomal translocations in leukemias involve oncogenes
-dominate disorder only one copy is needed

Mutations that activate proto-oncogene can be qualitative or quantitative

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8
Q

What are the different changes in chromosome structure that can occur to cause mutations

A

deletions = loss of genes

Translations = fusion of genes = fusion protein that can encourage cell division or prevent apoptosis

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9
Q

What are tumor suppressor genes

A

Normal genes that code for inhibitory proteins which help to resist malignant transformation - prevent cancer
-different oncogenes because they slow down cell division and promote apoptosis
-

if both alleles (need two to be deactivated) are lost or inactivated (mutations) = malignancy in comparison to protooncogene which is activated and then causes malignancy
-if one is turned off then the other allele can take over

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10
Q

What is the multi hit theory of malignancy

A
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11
Q

What happens when you have genetic mutations under normal vs malignant conditions

A

Errors occur regularly in DNA replication and normally the cell would stop dividing and go into apoptosis

In malignant conditions there will be disruptions and abnormal cells will be able to divide and a CLONE of leukemic cell would result.
Increased proliferation and arrested differentiation

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12
Q

Examples of Altered Gene Expression
-arrested differentiation

A

Acute Promyelocytic Leukemia
translocation
t(15:17) fusion gene causes arrested differentiation and the cell will not mature past the preomyelocyte stage

lymphocyte neoplasms
-excessive DNA repression will stop lymphs at germinal stage

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13
Q

What is the result of gene mutations

A

Loss of inhibitor proteins = uncontrolled proliferation - mutation in tumor suppression gene

Abnormal proteins produced (activation of protooncogenes )= stimulated proliferation and arrested differentiation

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14
Q

Leukemic cells are different from normal cells because

A

Functionally abnormal
Structurally abnormal
Maturation arrested before cell is fully mature
Unregulated Proliferation

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15
Q

What are the two objectives when treating leukemic cells

and what are the categories of treatment

A

-remove leukemic cells through cytoreduction

-provide supportive care

categories of treatment
Chemotherapy
Radiation therapy
Supportive therapy
Targeted therapy
Stem cell transplantation

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16
Q

What is chemotherapy ** listen

A

-made with anti tumor properties
-mode of action - interferes with cell cycle in BOTH normal and cancer cells
-affects mainly rapidly dividing cells
such those in the mucocsa, BM – especially malignant clones ** and GI mucosa – makes patients very sick**
-limits dosage and determines max dose

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17
Q

What would you expect the results of chemotherapy to be

A
  • marrow hypoplasia
    -destruction of leukemic cells
    -affects normal cells too reduction of WBC, RBC, and PLT
    -neutrophil and plt are routinely monitored because they are the first to be affected when someone is on chemo

-helps to improve quality of life but it can increase risk of infection by inducing neutropenia
-CSFs or cytokines will stimulate RBC formation in BM
-EPO for anemia
-can do transfusion for RBC and PLT if hgb is needed
-Abtics and Anti fungals can be given at the same time

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18
Q

How does radiation therapy work

A
  • kills cells by producing unstable ions which damage DNA causing instant or delayed death
    -toxic effects of treatment can occurring during or after
    -most affected are hematopoietic system, the gastrointestinal tract, and the skin
    -toxic effects are reversible and stop when the treatment stops
19
Q

What does targeted treatment do

A

-targets tumor cells and doesnt touch the normal ones
-type of specific therapy getting away from chemo or radiation

examples:
-uses monoclonal AB specific for CD AG
-CML – tyrosine kinase inhibitors block the fusion protein that causes uncontrolled proliferation

20
Q

What type of donors can be used for stem cell transplantation

What are the sources of stem cells for transplant

A

Types of donors
Identical twin (syngeneic transplant)- desirable
Genetically different (allogeneic transplant)
Patient’s own marrow (autologous transplant)

Sources for hematopoietic stem cells
Bone Marrow
Peripheral blood
Umbilical cord blood

STC trans very expensive and youll be in the hospital for a long time
-Stem cells will go to pt BM engraft, multiply and repopulate can be allogenic (from a donor) or autologous (from yourself)

prognostic score is between 3 – 4.5 so patients with a prognostic score of 3 or higher may be considered for HSC transplantation

21
Q

What complications can arise from HSC transplant

A

Allogenic - GVHD
-when donor T cells react against tissues of recipient
-acute (in post transplant time see with rash or diarrhea ) or chronic ( 100 days after transplant- skin lesions, Hep)
-higher fatality

Autologous you own cells transplanted but risk:
-disease can come back

22
Q

How is treatment monitored

A

-through blood work during treatment to assess transfusion requirements and BM response

can look at
RBC, PLTs, BM aspirate , cytogenic study
CBC, manual diff - % blasts, retic count- done daily , blasts should reduce

23
Q

What is complete remission

A

-goal in pt with acute leukemia

defined as
-absence of signs of leukemia
-absence of disease
-BM and blood cells count return to normal

no evidence but not cure

cure is remission for over 4 years and no return of disease and no therapy
Cures are realistic for Hodgkin Lymph, CML, Hairy cell leukemia, ALL

24
Q

What are the traditional classifications of leukemia

A

-based on maturity and clinical presentation

Acute = immature malignant cells found forming quickly in disease

Chronic - mostly mature forms of cells in disease that progresses slowly

25
Q

What are general classifications of leukemia

A

important for diagnosis, therapy and prognosis

Myeloid v.s. Lymphoid which line is malignancy in

Leukemia (proliferating WBC precursors) v.s. Lymphoma -solid tumor of lymphoid tissue

Mature v.s. Immature with arrested development

Proliferative (in one or more cell line) v.s. Dysplastic (cytopenia in cell line)

Leukemia – diffuse
Lymphoma – solid tumor

26
Q

What are the four major classifications

A

Myelodysplastic:
Defective maturation
Peripheral blood cytopenias

Myeloproliferative:
Increased numbers of immature myeloid-derived cells
Chronic Leukemias

Acute Leukemia – Myeloid or Lymphoid

Mature Lymphoid Neoplasms- solid tumor in lymph node

27
Q

What is FAB

A

-distinguishes between Myeloid and Lymphoid Leukemias, Chronic and Acute Leukemias
-based on Morphological characteristics, Cytochemical stains

can also be used for the classification of
-BM counts can be used
-flow uses CD markers
-Cytochemical uses granule contents seen

28
Q

What can give a more precise classification of leukocyte neoplasms

A

Recurring chromosomal translocations
Genetic lesions

29
Q

What does WHO emphasize

A

molecular and cytogenetic changes

classification of myloid malignancies with AMLs
B-ALL is subdivided into 7 types

T cell lymph are not divided subclinically

30
Q

What is a myelodysplastic syndrome

A

-acquired clonal hematological disorders
-progressive cytopenia’s in the peripheral blood with defects in erythroid, myeloid or megakaryocytic maturation

PB cytopenia despite hypercellular BM
Dyspoiesis in cell lines
-BM isnt making enough healthy cells

-age of most that get it 70
-develops after chemo or radiation
-mutated stem cell that proliferates into clone of abnormal cell
-need Bone marrow, PB, cytogenetics, molecular diagnostics & flow cytometry for diagnosis
-mimics MEGA and IDA

31
Q

What is refractory anemia or preleukemia

A

another name for myelodysplastic syndrome
-because pt have feature of megaloblastic anemia or iron deficiency anemia but didnt repost to treatment of iron, folic acid, B12

32
Q

How does MDS occur

A

-GEMM myeloid progenitor is mutated
-affecting erythroid, myeloid or megakaryocytic cell lines
-lymphoid not likely affected
-mutated stem cell produces a pathologic clone that expands at the expense of other cells = dysplastic hematopoiesis
-can disrupt apoptosis causing premature death
-apoptosis regulated cell population by decreasing cell survival

33
Q

MDS vs. Leukemia

A

Chromosome abnormalities in MDS are usually chromosomal deletions as opposed to translocations like in Acute leukemia

distinguish based on morphology, % blasts, cytogenetic abnormalities

34
Q

What is dyspoiesis

A

occurs in MDS
-when blood cells become abnormal in appearance and function
-pancytopenia in PB with <20% in BM
-preleukemia turns into leukemia

-MDS has 20% more blasts in BM
MDS does transform into leukemia so monitoring BM is important

35
Q

Morphologic Evidence of Dyserythropoiesis
In Peripheral blood:

A

Oval macrocytes even with normal B12
Hypochromic microcytes even with normal iron
Dimorphic RBC population
Basophilic stippling, HJB,

36
Q

Morphologic Evidence of Dyserythropoiesis
In Bone Marrow

A

RBC precursors with:
More than one nucleus - lobes or buds
Abnormal nuclear shapes
Uneven cytoplasmic staining - Bso stippling, or uneven staining
Ringed sideroblasts
precursors also showing nuclear bridging

37
Q

What will neutrophils look like in Dysmyelopoiesis

A

nuclear or cytoplasmic dysplasia

cytoplasm is unevenly stained or is basophilic
-hypo/hyper granulation

Nucleus
hypo or hyper segmentation
Pseudo- Pelger Huet
-Asynchrony in maturation where the chromatin is clumped but the shape is immature (hyposegmented)

38
Q

Dysmegakaryocytopoiesis in MDS - Morphology

A

Thrombocytopenia (60%)
Giant platelets
Hypogranulation
Micromegakaryocytes in PB seen with budding of the cytoplasm

39
Q

What abnormal function can arise from abnormal maturation of cells

A
  • granulocytes can have decreased adhesion, deficient phagocytosis, decreased chemotaxis, or impaired microbicidal capacity

RBCs can have shortened lifespans, precursors can have a decreased response to EPO causing anemia

-pts can have increased bleeding despite adequate number of platelets

type and degree of dysfunction depend on the mutation present in the hematopoietic stem cell.

40
Q

What other conditions can cause dysplasia

dysplasia is not enough to diagnose MDS

A

Vitamin B12or folate deficiency (pancytopenia and dysplasia)
-heavy metals (Copper deficiency may cause reversible myelodysplasia)
-Fanconi anemia and congenital dyserythropoietic anemia
-Parvovirus B19 and some chemotherapeutic agents
-Paroxysmal nocturnal hemoglobinuria
-Human immunodeficiency virus (HIV)

41
Q

Myelodysplastic Syndrome (MDS) Classification:

FAB and WHO

A

FAB – based on morphology
% blasts in BM
amount of dysplasia
Which cells lines show pancytopenia

Refractory
RARS, RAEB, CMML, RAED-t

WHO – based on :
Molecular
Cytogenetic
Chromosome abnormalities
Best to differentiate from acute leukemias
Immunological (CD markers)

42
Q

What is Refractory Anemia (RARS)

A

low grade MDS with anemia and BM erythrodysplasia
-low amount of blasts
-can have megaloblastic changes with oval macros, multi nucs, fragmentation, or cytoplasmic budding
-has 15% ringed sideroblasts where iron laden mitochondria are around 1/3 of the nucleus

43
Q

What is Chronic Myelomonocytic Leukemia CMML

A

-persistent monocytosis of more than 1.0× 10^9/L
-too many monos and immature monos
-less blasts and promonocytes
-dysplasia in 1 or more myeloid cell lines
-pts will have increased leukocytes with absolute monocytosis
-splenomegaly

44
Q

colonial diseases

A

hematological conditions that are derived from a single cell