Leukemia, Lymphoma, & White Cell Disorders Flashcards
> 20% blasts found on bone marrow aspirate/biopsy confirms the diagnosis of _____
AML
In AML, myeloblasts express stem cell marker _____, as well as HLA-DR, and markers of granulocyte maturation such as ____ and _____
CD34; CD33, CD13
What translocation is associated with the diagnosis of AML with maturation, and is the most frequent abnormality in kids with AML?
t(8;21)
Involves RUNX-AML1 gene which encodes core-binding factor required for hematopoiesis
May be accompanied by loss of a sex chromosome, or a del(9q) with loss of 9q22
T/F: t(8;21) is associated with a favorable px in adults, but a poorer px in children
True
_____ and _____ are cytogenetic changes associated with Acute Myelomonocytic Leukemia (AMML)
Inv(16) and t(16;16)
[breakpoint occurs in CBFB gene and affects RUNX1/AML1 pathway regulating hematopoeisis]
Leukemia characterized by abnormal eosinophils including large irregular basophilic granules and positive reactions with PAS and chloroacetate esterase
AMML
AMML with inv(16) and t(16;16) is associated with a good px with intensive chemotherapy, but prognosis is worse if _____ mutation is also present
KIT
Translocation associated with acute promyelocytic leukemia
t(15;17)
Involves disturbance of retinoic acid receptor resulting in PML-RARA fusion —> RA repression via HDAC-dependent chromatin remodeling
APL with t(15;17) translocation is sensitive to therapy with ______________
Mutations that cooperate with PML-RARA are _____ internal tandem duplications (ITDs)
All-trans retinoic acid
FLT3
FLT3-ITD mutations may occur in any AML subtype but most commonly in ____ and AML with a normal karyotype. These mutations are associated with a _____ prognosis
APL; poor
NPM1 mutations most commonly involve exon 12 leading to alterations at C-terminus, replacement of tryptophan at position 288 and 290 causing the protein to be aberrantly localized to the cytoplasm. What do NPM1 mutations in AML tell you about the prognosis?
Associated with a favorable px in the absence of FLT3 mutations
2 major risk factors for development of AML
History of radiation or benzene exposure
History of chemotherapy with alkylating agents
Condition in which leukemic blasts occlude microcirculation leading to complications such as respiratory failure and cerebral dysfunction
Leukostasis syndrome
Presentation of AML including locations of extramedullary invasion
Nonspecific sxs such as fatigue, pallor from anemia, bleeding issues like bruising and petechiae (d/t underlying thrombocytopenia), increased infections, variable degree of LAD and HSM
Extramedullary invasion of gingivae, skin, and meninges [gingival hypertrophy typically associated w/M4 and M5 variants of AML]
Common complaint is “bone pain”
Clinical/lab findings associated with AML
Elevated leukocyte count
Anemia
Thrombocytopenia
Blasts on peripheral smear
3 phases of tx for AML
Phase 1 = Induction — 3 days of anthracycline (daunorubicin or idarubicin), 7 days of continuous infusion of cytarabine
Phase 2 = Consolidation — High dose Ara-C (HDAC)
Phase 3 = Maintenance — ATRA (given only if APL subtype)
Major risk associated with induction phase of AML tx
Tumor lysis syndrome — characterized by abrupt necrosis of large mass of leukemia cells and release of their contents into circulation; pancytopenia, infections, bleeding complications
t(15;17) translocation, proliferation of promyelocytes with their primary granules
Presents with significant bleeding d/t fibrinolysis and DIC
APL
Tx for APL is initiated with all-trans retinoic acid (ATRA), what are the 2 major purposes of this tx?
Induces maturation of promyelocyte
Ameliorates DIC
3 phases of APL tx
- Induction with ATRA + arsenic trioxide
- Consolidation with HDAC
- Maintenance with ATRA
Most common rearrangement in adult ALL
t(9;22) —> BCR-ABL1 fusion (Ph chromosome)
ALL is usually of B cell lineage (CD10, CD19, TdT), but can have myeloid markers including CD13 and CD33. BCR-ABL1 fusion may be associated with _____ gene alterations, which typically indicate ____ px
IKZF1; poor
What translocation is associated with ALL in which cells have cytoplasmic Ig, CD10+, CD19+, CD34-, and CD9+
t(1;19)
Implications of t(8;14) translocation in ALL
Indicates mature B cell ALL — typically associated with high incidence of CNS involvement and/or abdominal nodal involvement at dx
Poor outcome; improved with high intensity chemotherapy