[Blast crisis in chronic myeloid leukemia].

Although the worst prognosis among acute forms of leukemia is persistently attributed to the blast crisis of chronic myeloid leukemia, a therapeutic nihilism seems to us to be unreasonable. Even in the developing stage of a blast crisis we consider an aggressive chemotherapy to be justified particularly in younger patients. In this connection, value and necessity of supporting of therapy are especially emphasized. Remissions can be achieved in about one third of patients during the blast crisis of CML. As in other forms of tumour therapy, the initial status, age, and secondary diseases have to be taken into account and a careful, individual therapy planning has to be made. For the future there is the hope that the increasing possibilities of differentiating blasts will allow more systematic therapeutic conclusions to be made. According to the present knowledge the greatest hopes for achieving long-term remissions or even healings can, in our opinion, be expected by bone-marrow transplantation.