Hematology Oncology Flashcards
What is the appearance of an acanthocyte? What is another name?
“Spiny” appearance on blood smear; also called spur cell
What pathology is associated with a spur cell (acanthocyte)?
Liver disease, abetalipoproteinemia (states of cholesterol dysregulation)
What type of RBCs might you see in abetalipoproteinemia?
Acanthocytes
Basophilic stippling is due to aggregation of what in the RBC?
Residual ribosomes
What pathology is associated with basophilic stippling?
Lead poisoning, sideroblastic anemias, myelodysplastic syndromes
Bite cells are seen in what disease?
G6PD
What is seen on a peripheral smear in a patient with G6PD?
Bite cells and Heinz bodies
When do you see Howell-Jolly bodies on a peripheral smear?
Functional hypospenia, asplenia, naphthalene poisoning
What are Howell-Jolly bodies?
Basophilic nuclear remnants found in RBCs
What pathology is associated with echinocyte?
End stage renal disease, liver disease, pyruvate kinase deficiency
There are two categories of normocytic anemia, nonhemolytic and hemolytic. How do you differentiate between the two?
Nonhemolytic has a reticulocyte count that is normal or low; hemolytic has a high reticulocyte count
What are the symptoms for lead poisoning?
Lead lines on gingivae (burton lines) and on metaphyses of long bones, encephalopathy, erythrocyte basophilic stippling, abdominal colic, sideroblastic anemia, wrist/foot drop
What are first line treatments for lead poisoning?
EDTA and dimercaprol
A kid with lead poisoning is given what?
Succimer
What enzymes are inhibited by lead?
Ferrochelatase and ALA dehydratase
What is the rate limiting step in heme synthesis?
ALA synthase
What is the genetic mutation resulting in sideroblastic anemia?
X linked defect in ALA synthase gene
What are the lab findings in sideroblastic anemia?
Increased iron, increased transferrin sat %, normal/decreased TIBC, increased ferritin
What are increased in the serum of B12 def?
Homocysteine and methylmalonic acid are increased
Orotic aciduria without hyperammonemia is seen in what disease? What enzyne is deficient?
Orotic aciduria due to UMP synthase defect
Ornithine transcarbamoylase def is differentiated from UMP synthase def how?
OTC def has hyperammonemia, UMP synthase def does not
What drugs can cause aplastic anemia?
Benzene, chloramphenicol, alkylating agents, antimetabolites
What is the most common inheritance pattern of Hereditary spherocytosis?
Autosomal dominant
What are some examples of common defective proteins in hereditary spherocytosis?
Spectrin, ankyrin, band 3, protein 4.2
What type of hemolysis is seen in hereditary spherocytosis?
Extravascular - macrophages cause the hemolysis
What is the inheritance of pyruvate kinase def?
Autosomal recessive
What may be seen on peripheral smear in pyruvate kinase def?
Burr cells “echinocytes”
Newborn presents with persistent jaundice and reticulocytosis. Osmotic fragility test is normal. What may be the underlying disease?
Pyruvate kinase deficiency
How does pyruvate kinase def. present?
Neonatal hemolytic anemia - persistent jaundice with reticulocytosis
What is seen on peripheral smear of G6PD def?
Heinz bodies and bite cells
What drugs can cause hemolytic stress in a patient with G6PD def?
Isoniazid, sulfonamides, ASA, Ibuprofen, dapsone, antimalarials, nitrofurantoin
What type of hemolysis is seen in Pyruvate kinase def?
Extravascular hemolysis
What is the “classic triad” associated with paroxysmal nocturnal hemoglobinuria?
Negative direct antiglobin (Coombs) test, venous thrombosis and pancytopenia
RBCs in paroxysmal nocturnal hemoglobinuria are negative for what?
CD55 and CD59
What is the importance of CD55?
Prevents formation of C3 convertase
What is the importance of CD59?
Blocks C9 from binding to RBC and therefore MAC formation
What is the treatment for paroxysmal nocturnal hemoglobinuria?
Eculizumab - prevents C5 conversion to C5a and C5b
Patients with PNH are at increased risk for what cancer?
Acute myeloid leukemia
What is the cause of sickle cell anemia?
Single point mutation in beta chain resulting in substitution of glutamic acid with valine
Hemoglobin C is formed as a result of what?
Point mutation in the 6th codon of beta Hgb chain that leads to replacement of glutamic acid residue with a lysine residue
What is seen on a peripheral smear of someone with sickle cell anemia?
Codocytes (target cells), sickle cells, Howell-Jolly bodies
An X ray of a patient with sickle cell anemia may reveal what?
Crewcut appearance
What drug is used for “treatment” of sickle cell anemia? What is its MOA?
Hydroxyurea - thought to stimulate HbF production
What are some causes of warm AIHA?
Autoimmune diseases (SLE), CLL, and various drugs (cephalosporins, penicillins, penicillin derivative, alpha-methyldopa)
What infectious organisms can cause cold agglutinin type immunohemolytic anemia?
Mycoplasma pneumoniae and EBV infectious mono
What are the lab values in iron def. anemia?
Low iron, low ferritin, low % transferrin saturation, elevated transferrin (or TIBC)
What are the lab values in anemia of chronic disease?
Low iron, elevated ferritin, low TIBC (or transferrin)
What are the lab values in hemochromatosis?
Elevated iron, elevated ferritin and % transferrin saturation, low transferrin (TIBC)
What are the lab values in anemia associated with prgenancy?
Elevated transferrin or TIBC, low % transferrin saturation
What are the beginning substrates for heme synthesis?
Glycine and succinyl CoA
What is the first step in heme synthesis? What enzyme is responsible for this?
Making delta-aminolevulinic acid; ALA synthase (rate limiting enzyme)
ALA synthase is responsible for what step in heme synthesis? What does it require?
1st step in heme synthesis - the rate limiting step; requires B6
What enzymes are affected by lead poisoning?
Ferrochelatase and ALA dehydratase
What accumulate in the blood in lead poisoning?
ALA and protoporphyrin
What enzyme is affected in Acute intermittent porphyria?
Porphobilinogen deaminase (aka uroporphyrinogen I synthase)
What accumulates in acute intermittent porphyria?
Porphobilinogen and ALA
What are the symptoms of acute intermittent porphyria?
Sxs come and go; Palpitations, port-wine urine, painful abdomen, polyneuropathy, psychological disturbances (depression), precipitated by drugs
What is the treatment for acute intermittent porphyria?
Glucose and heme (hemin) to inhibit ALA synthase
Defective porphobilinogen deaminase results in what condition?
Acute intermittent porphyria
What is the affective enzyme in porphyria cutanea tarda?
Uroporphyrinogen decarboxylase
What accumulates in porphyria cutanea tarda?
Uroporphyrin (tea-colored urine)
What is used to treat porphyria cutanea tarda?
Repeated phlebotomy
What exacerbates porphyria cutanea tarda?
Alcohol consumption
Defective uroporphyrinogen decarboxylase results in what disease?
Porphyria cutanea tarda
PT tests function of what?
Common pathway and extrinsic pathway in regards to coagulation
What are the hemophilias?
Bleeding disorders characterized by def in one of the factors involved in the intrinsic pathway of the coagulation cascade
Hemophilia A is a deficiency in what?
Factor VIII
What is the inheritance pattern of Hemophilia A?
X linked recessive
Hemophilia B is a defect in what?
Factor IX
What is the inheritance of Hemophilia B?
X linked recessive
What is the deficiency in Hemophilia C?
Factor XI
What is the inheritance of Hemophilia C?
Autosomal recessive
Hemophilias result in what lab findings?
Increased PTT and normal PT/INR
PTT measures what?
Intrinsic pathway (all factors except VII and XIII)
What mutation gives rise to Factor V Leiden?
Arg506Gln mutation - DNA point mutation in the factor V gene
What is the inheritance pattern of Factor V Leiden?
Autosomal dominant
What mutation results in Prothrombin gene mutation and therefore an increase in production of prothrombin>
Mutation in the 3’- untranslated region of the prothrombin gene
What disease is characterized by small than anticipated increase in PTT following administration of heparin?
Antithrombin deficiency
What disease commonly presents as skin and subcutaneous tissue necrosis following administration of warfarin?
Protein C or S def
Patients with Protein C or S def. have diminished ability to inactivate what?
Coagulation factors Va and VIIIa
What are the notable lab findings in DIC?
Low Plts, low fibrinogen, increased FDPs, increased PT, PTT, BT
What is seen on peripheral smear of DIC?
Schistocytes
What is the inheritance pattern of von Willebrand disease?
Autosomal dominant (vs hemophilias AR or XR)
What are the lab findings in von Willebrand disease?
Prlonged BT and PTT, normal PT
What is PTT prolonged in vWF disease?
Von Willebrand factor normally protects factor VIII
What is a ristocetin agglutination assay?
Induces vWF to bind platelet GpIB resulting in platelet agglutination
What is the results of the ristocetin agglutination assay in von Willebrand disease?
Impaired platelet aggregation
What does vWF bind on the platelet?
GpIb
ADP binding to PDY12 receptor on the platelet results in what?
GpIIb/IIIa insertion on the platelet membrane
What binds GpIIb/IIIa on the platelet?
Fibrinogen - helps platelets bind together
What drugs compete for ADP at the P2Y12 receptor?
Clopidogrel, prasugrel, ticlopidine
How does thrombotic thrombocytopenic purpura present?
Pentad: neurologic sxs, renal failure, fever, thrombocytopenia, microangiopathic hemolytic anemia
What causes thrombotic thrombocytopenic purpura?
Deficiency of ADAMTS 13
What is ADAMTS13?
Von Willebrand factor metalloprotease - normally degrades vWF multimers
How does hemolytic uremic syndrome present?
Thrombocytopenia, microangiopathic hemolytic anemia, and acute renal failure
What are the lab findings in thrombotic thrombocytopenic purpura?
Normal PT and PTT, increased bleeding time; additionally increased LDH and megakaryocytes
What is the cause of immune thrombocytopenia?
Antibodies against GpIIb/IIIa, resulting in splenic macrophage consumption of plt-ab complex
What causes thrombotic thrombocytopenic purpura?
Def of ADAMTS13
What is the cause of Bernard-Soulier syndrome?
Low GpIb resulting in defect in plt-vWF adhesion
What is the result of the ristocetin assay in Bernard Soulier syndrome?
No aggregation
What is in cryoprecipitate?
Fibrinogen, factor VIII, factor XIII, vWF and fibronectin
What is given in DIC?
Fresh frozen plasma
What are the “B” symptoms? When do you classically see them?
Fever, night sweats, and weight loss; classically HL, but also NHL
What type of Hodgkins lymphoma is is seen more commonly in women over men?
Nodular sclerosing type
When do you see Reed Sternberg cells?
Hodgkins lymphoma
Reed sternberg cells are positive for what cells markers?
CD15 and CD30
What is the appearance of Reed Sternberg cells?
Bilobed nucleus or binucleate with prominent eosinophilic nucleoli; “owl eyes” appearance
What type of HL has lacunar cells? What do they look like?
Nodular sclerosis HL; multilobated nucleus that lies in an open, pale cytoplasm
HL characterized by cells with multilobated nucleus that lies in an open, pale cytoplasm
Nodular sclerosing type
What type of HL is characterized by eosinophilia?
Mixed cellularity type
What are eosinophils seen in Mixed cellularity type HL?
RS cells release IL-5
Describe the appearance of “popcorn cells.” What cancer are they seen in?
Polylobulated nuclei and small peripheral nucleoli without perinucleolar halos; seen in lymphocyte predominant
What cells are seen in nodular lymphocyte-predominant HL?
Popcorn cells - lymphocytic and histiocytic
HL that presents with negative CD15 and CD30 cells is seen in what type?
Nodular lymphocyte predominant HL
What translocation is associated with follicular NHL?
Translocation 14;18 - resulting in overexpression of Bcl2
Translocation 14;18 results in what NHL?
Follicular NHL
Ig heavy chain is on what chromosome?
14
How do you differentiate follicular hyperplasia from lymphoma?
Follicular lymphoma has monoclonality, Bcl2 expression, and absence of tingible body macrophage in the germinal center
What translocation is associated with Mantle cell lymphoma?
Translocation 11;14 - overexpression of Cyclin D1
NHL with CD5+ and CD23- B cells and translocation 11;14
Mantle cell lymphoma
What type of B cell are seen in Mantle Cell lymphoma?
CD5+ and CD23-
How do you differentiate between CLL and Mantle Cell lymphoma?
CLL is CD23+ and mantle cell is CD23-
What translocation is seen in marginal zone lymphoma?
Translocation 11; 18
Translocation 11;18 is seen in what NHL?
Marginal zone lymphoma
What disease of chronic inflammation can result in marginal zone lymphoma?
Sjogrens, chronic gastritis (H pylori infection) and Hashimoto thyroiditis
What translocation is seen in Burkitt lymphoma and what does it result it?
8;14 - overexpression of c-myc
What chromosome is c-myc on?
8
Translocation 8;14 results in what cancer?
Burkitt lymphoma
Describe the starry sky appearance seen in Burkitt lymphoma
Reactive histiocytes in a backdrop of blue neoplastic cells
Bcl-2 is on what chromosome?
18
Adult T cell lymphoma is caused by infection with what?
Human T cell lymphotropic virus type 1
Infection with HTLV-1 can cause what?
Adult T cell lymphoma
What is the genome of HTLV-1?
+ssRNA; retroviridae family
What is a Pautrier microabscess? What is it associated with?
Intraepidermal neoplastic cell aggregates associated with mycosis fungoides
Describe the characteristic cells seen in Mycosis fungoides
Atypical CD4+ cells with cerebriform nuclei and intraepidermal neoplastic cell aggregates
What is mycosis fungoides?
CD4+ neoplasm characterized by skin patches/plaques with cells with cerebriform nuclei
What is Sezary syndrome?
Progression of Mycosis fungoides
What is the Pseudo-Pelger-Huet anomaly?
Neutrophils with bilobed nuclei. Typically seen after chemotherapy
How can you differentiate between Waldenstrom macroglonulinemia and Multiple myeloma?
WM has IgM M spike; Mult myeloma has IgG or IgA M spike
What is the difference between MGUS and multiple myeloma?
MGUS = bone marrow <10% monoclonal plasma cells; no CRAB findings
Tdt is a marker for what?
Pre-T and pre-B cells
CD10+ is a marker for what?
Marker of pre-B cells
Pre-T ALL expresses what cell markers on flow cytometry?
Tdt+, CD3+, CD7+; also is PAS positive