Preleukemia: Definition and Classification.- Conventional Morphological Examination of Blood and Bone Marrow Cells in the Diagnosis of Preleukemic Syndromes.- Pure Red Cell Aplasia Type III: Progression to Acute Myeloid Leukemia and Absence of the IgG Inhibitor to Erythropoiesis.- Discussion.- Blood and Bone Marrow Follow-Up Studies on Patients with Preleukemic States Observation of Different Phases of the Evolving Leukemic Process.- Discussion.- Abnormalities of Granulocytes and Megakaryocytes in Preleukemic Syndromes.- The Platelet Ultrastructure in Preleukemia.- Hereditary Deficiency of Myeloperoxidase and Preleukemia?.- Discussion.- Cytochemical Investigations on the Blood and Bone Marrow Cells in Preleukemia Demonstration of Maturational Anomalies.- Complementary Investigations in Myelodysplastic Syndromes.- Discussion.- Chromosome Findings in Preleukemia.- Discussion.- Cell Proliferation in Refractory Anemia with Hyperplastic Bone Marrow (Preleukemia).- Bone Marrow Cell Kinetics in Patients with Pancytopenia.- Discussion.- In Vitro Disorders of Granulopoiesis in Preleukemia.- Sequential Marrow Culture Studies and Terminal Deoxynucleotidyl Transferase Activities in Myelodysplastic Syndromes.- The Value of In Vitro Culture in Diagnosis and Progress in Preleukemia and Oligoblastic Leukemia.- Discussion.- A Prospective Study of Patients with Preleukemia.- The Factors of Prognosis in Refractory Anaemia with an Excess of Blasts in the Bone Marrow.- Studies on Human Preleukemia VII Prognostic Factors for the Diagnosis of the Preleukemic Stage in Aregenerative Anemia with Hypercellular Bone Marrow.- Discussion.- Tests for Diagnosis of Preleukemic States Round Table Discussion.- How can We Interpret the Cell-Kinetic Status of Preleukemia?.- Discussion.- Androgen Therapy in the Refractory Anemia with Excess of Myeloblasts in the Bone Marrow.- Cytotoxic Drugs in the Treatment of Preleukemic Syndromes.- Discussion.- Speculations on Problems of Immunology in Preleukel]