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1 Division of Metabolism and Enzyme Studies and the Division of Clinical
Investigation, Sloan-Kettering Institute, and the Department of Medicine, Memorial and
James Ewing Hospitals, New York, N. Y.
A case is reported of thrombocytopenia developing suddenly in a patient
with metastatic carcinoma. Studies of this patients serum revealed a platelet
agglutinin presumed to be related to the development of the thrombocytopenia in spite of the failure to demonstrate autoagglutination. In addition, a
technique is described for the detection of a platelet lysin and clot retraction
inhibitor, both of which could be demonstrated in this patients serum. The
identity of the lysin and retraction inhibitor is suggested. Studies on the serums of other patients showed a dissociation between the
occurrence of platelet agglutinin on the one hand and of platelet lysin and
retraction inhibitor on the other.
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