Chapter I INTRODUCTION Individuals who were born in the nineteenth century and have lived through the cataclysmic events of the twentieth have been forced ...

Cell lines and cell samples from patients provide opportunities for studying the mechanisms of leukemic cellular differentiation and proliferation. Phorbol esters and 1,25 dihydroxy vitamin D3 can induce differentiation of myeloid leukemic cells to macrophages. Differentiation to granulocytes can be induced by several different compounds. Myeloid differentiation is associated closely with the alteration in expression of several oncogenes. These regulatory events may be associated with the extent of methylation, unfolding or association of chromatin to the nuclear matrix. Oncogene amplification, mutation, (...) or deletion can occur with malignant transformation. Future studies point to the development of specific pharmacological agents which can modify the neoplastic transformation. (shrink)