Aplastic Anemia and bone marrow failure syndromes Flashcards

1
Q

What are the physical features seen in Fanconi aplastic anemia?

A

Thumb abnormalities, short stature, microcephaly, patchy brown pigmentation.

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2
Q

What is the underlying abnormality in Fanconi Anemia (what genes are involved)?

A

Most patients have mutations involving FANCA or FANCC which are involved in DNA repair.

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3
Q

What is characteristic about the DNA in Fanconi anemia patients?

A

Their DNA is hypersensitive to damage induced by DNA crosslinking agents (e.g. DEB and mitomycin C).

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4
Q

What is the mode of inheritance for most patients with Fanconi Anemia?

A

Autosomal recessive

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5
Q

How do you diagnose Fanconi Anemia?

A

By doing chromosome breakage study, the report will tell you the percentage of cells with chromosome aberrations.

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6
Q

How do patients with short telomere syndromes present?

A

Nail dystrophy, skin hyperpigmentation, early graying of hair, and oral leukoplakia.

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7
Q

What are the modes of inheritance seen with short telomere syndrome? What is the defect seen here?

A

Autosomal dominant, autosomal recessive, and X-linked. The teleomerase enzyme is missing to add telomeres.

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8
Q

What malignancies are patients with Fanconi Anemia at risk for?

A

MDS/AML! Also at risk for squamous cell carcinoma of the Head/neck, esophageal, and vulvar/vaginal tumors. Also hepatocellular carcinoma

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8
Q

What are some complications seen in short telomere syndrome?

A

Pulmonary Fibrosis, cirrhosis, vascular complications (AV malformations), hepatopulmonary syndrome.

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9
Q

What malignancies are short telomere patients at risk of?

A

Squamous cell carcinoma of head/neck, anogenital, and GI cancers.

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10
Q

What treatment can you offer for short telomere syndrome besides allogeneic transplant?

A

Androgens-oxymetholone or danazol.

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11
Q

What is the defect seen in GATA 2 deficiency?

A

A GATA 2 mutation causes loss of expression or function of the Zinc finger transcription factor required for hematopoiesis and lymphatic development.

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12
Q

What are some clinical features seen in GATA 2 deficiency?

A

Congenital deafness, lymphedema, autism/ADHD, interstitial lung dx, warts, frequent infections (mycobacteria infections), w/wo cytopenias.

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13
Q

What cytogenetic abnormality is commonly seen in GATA 2 def and what does this suggest?

A

Monosomy 7 and trisomy 8, can suggest development of MDS/AML.

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14
Q

What are the clinical features of SMAD 9/9L?

A

Ataxia, adrenal hypoplasia, ambiguous genitalia

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15
Q

How do you make the diagnosis of SMAD 9/9L? What are they at risk for?

A

They will have monosomy 7 (compensates for mutation) or UPD7q (results in duplication of the wild type 7q arm). MDS/AML

16
Q

What are the clinical features of Shwachman Diamond Syndrome?

A

BM failure (most often neutropenia), exocrine pancreatic insufficiency (malabsorption)

17
Q

Patients with Shwachman Diamond Syndrome are at high risk of developing what?

A

MDS/AML

18
Q

What are the clinical features of Diamond Blackfan Anemia? What test can confirm this?

A

Hypo-proliferative bone marrow with macrocytic anemia, marrow has a high M:E with practically no erythroblasts, thumb anomaly, cleft palate, etc. Fetal Hgb is elevated. RBC ADA levels are high-confirmatory test.

19
Q

What are the treatment options for Diamond Blackfan Anemia?

A

RBC transfusion support with iron chelation, corticosteroids, and allogeneic HSCT.

20
Q

What patients are eligible for stem cell transplant in aplastic anemia?

A

Patients less than age 40 who have a HLA matched sibling, if they don’t have one they get treated with IST.

21
Q

What is the hallmark clinical features of PNH? What are the smooth muscle symptoms?

A

Intravascular hemolysis with DVT/PE (esp in a odd location). Smooth muscle dystonia-esophageal spasm, abd pain, dysphagia, erectile dysfunction.

22
Q

What is the molecular target of Eculizumab and Ravulizumab? This inhibits what part of the complement pathway?

A

They are C5 inhibitors. The terminal complement pathway (prevents formation of MAC).

23
Q

What are some of the more common side effects of terminal complement inhibitors?

A

Headache, nasopharyngitis, URI, nausea, pyrexia

24
Q

What is the mechanism of action for Pegcetacoplan? What does this allow to happen?

A

It block C3! It prevents C3 mediated extravascular hemolysis.

25
Q

What is the vaccination recommendation for those on complement therapy?

A

You vaccinate against N meningiococcus 2 or more weeks before giving the first dose. You also give antibiotic prophylaxis for the first 2 weeks of therapy.

26
Q

Thymoma, LGL, and CLL can be associated with what?

A

Pure Red Cell Aplasia