Non-random Karyotype Progression in Chronic Myeloid Leukaemia

Abstract
A case of chronic myeloid leukaemia is reported, which in the past had been given a therapeutic dose of 131I for thyrotoxicosis. Cytogenetic studies performed shortly before death showed a stem-cell chromosome number 49(2PH1 and 2C9) and a sufficient number of 47 and 48 cells to suggest an evolutionary pattern. The possible role of the 131I therapy is discussed.