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Unclassifiable Leukemias - Proceedings of a Symposium, held on October 11 - 13, 1974 at the Institute of Cell Pathology, Hopital de Bicetre, Paris, France. (Paperback)
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Unclassifiable Leukemias - Proceedings of a Symposium, held on October 11 - 13, 1974 at the Institute of Cell Pathology, Hopital de Bicetre, Paris, France. (Paperback)
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Jean BERNARD * I should like to begin with an assumption and a
paradox. The assumption is that leukemia is a disease of a stem
cell characterized by pathologie alterations of that cell and its
progeny. All present research and discussions are centered around
the leukemic cell. So is this symposium, which would not take place
except for our primary interest in the leukemic cell. This does not
preclude, of course, consideration of other definitions and other
approaches to the prOblem. By definition, then, the leukemic cells
are abnormal cells and their metabolism and functions are presumed
to be abnormal. Yet, the classification of the different types of
leukemias is based upon the characteristics of normal cells. We
talk of "lymphoblasts" and "myeloblasts" as predominant cell types
in leukemia. This leads to a double paradox. In the first pi ace it
is clearly illogical to classify abnormal cells by their
resemblance to normal cells, since their very abnormality consists
in not being normal. Yet, as a second paradox, the classifica ti on
has had the happy consequence of ai ding us in the treatment and
prognosis of leukemia for the past 25 years. A more detailed
analysis shows that the consequence of this paradox are complex:
while there exists a useful correlation between cellular types,
treatment and prognosis, numerous problems and difficulties
persist. The most serious of them concems the "unclassified
leukemias" which are the reason for this reunion.
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