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1 Departments of Biochemistry and Medicine, St. Boniface Hospital, St. Boniface,
Manitoba; and the Department of Physiology and Medical Research and the Department
of Medicine, University of Manitoba, Winnipeg, Canada.
Two enzymes, lactic dehydrogenase (LD) and phosphohexose isomerase
(PHI), were measured in the plasma of 30 patients with leukemia and compared with the findings in 66 control subjects. Abnormally elevated PHI
levels were found in both acute and chronic myelocytic leukemia, but not
in lymphocytic leukemia. The plasma LD was increased above normal in
acute and chronic myelocytic leukemia, in acute lymphocytic, but not in
chronic lymphocytic leukemia. Both enzymes were normal or only slightly
raised in three patients with the aleukemic type of the disease. Hemolytic
anemia in seven leukemic patients was associated with high plasma LD values
in the presence of relatively low PHI levels. Results of serial enzyme studies from the time of diagnosis until death
indicated that both plasma enzymes, but especially the LD, usually reflected
changes in the course of the disease-falling during remissions and rising
during relapses. In most cases this enzyme paralleled the leukocyte level
but occasionally indicated the onset of a relapse or remission before the
white cell count had begun to change.
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