Alter, B. P. (2005). "Bone marrow
failure: a child is not just a small adult
(but an adult can have a childhood disease)." Hematology
Am Soc Hematol Educ Program: 96-103.
Aplastic anemia may be inherited or acquired.
The distinction between these lies
not in the age of the patient, but in the
clinical and laboratory diagnoses. Adult
hematologists must consider adult presentations
of the inherited disorders, in
order to avoid incorrect management of
their patients. Physicians for adult
patients must also realize that children
with inherited disorders now survive to
transition into their care. The major inherited
bone marrow failure syndromes
associated with development of pancytopenia
include Fanconi anemia,
dyskeratosis congenita, Shwachman-Diamond
syndrome, and amegakaryocytic
thrombocytopenia. The ages at presentation
are highly variable, but often include
individuals of adult age who have previously
undiagnosed Fanconi anemia or
dyskeratosis congenita. Many of the genes
responsible for these disorders have
been identified (12 Fanconi anemia genes,
3 dyskeratosis congenita genes, and
1 each for Shwachman-Diamond syndrome and
amegakaryocytic
thrombocytopenia). A high index of suspicion
and specific testing of children or
adults with what appears to be acquired
aplastic anemia may identify inherited
disorders. Correct classification of patients
with aplastic anemia of any age is
mandatory for their appropriate management. |
Alter, B. P.
(2007). "Diagnosis,
genetics, and management of inherited bone
marrow failure syndromes."
Hematology
Am Soc Hematol Educ Program 2007: 29-39.
The inherited bone marrow failure syndromes
are traditionally considered to be
pediatric disorders, but in fact, many
of the patients now are diagnosed as
adults,
and many diagnosed as children now live
to reach adulthood. The most common
of these rare disorders include Fanconi
anemia, dyskeratosis congenita,
Shwachman-Diamond syndrome and amegakaryocytic
thrombocytopenia, which
often develop aplastic anemia and may
evolve into myelodysplastic syndrome
and acute myeloid leukemia; and Diamond-Blackfan
anemia, severe congenital
neutropenia, and thrombocytopenia absent
radii, single cytopenias that rarely
if
ever become aplastic but have increased
risks of leukemia. In addition, the first
three syndromes have high risks of solid
tumors: head and neck and anogenital
squamous cell carcinoma in Fanconi anemia
and dyskeratosis congenita, and
osteogenic sarcoma in Diamond-Blackfan
anemia. Diagnosis of a marrow failure
syndrome requires recognition of characteristic
physical abnormalities when
present, and consideration of these disorders
in the differential diagnosis of
patients who present with "acquired" aplastic
anemia, myelodysplastic syndrome,
acute myeloid leukemia, or atypically
early cancers of the types seen in the
syndromes. Ultimate proof will come from
identification of pathogenic mutations
in genes associated with each syndrome. |