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Background.Refractory is one of the critical problems in the course of treatment of chronic lymphocytic leukemia.Presence of cytogenetic abnormalities,such as 11 chromosome deletion (11 q-) and 17 chromosome deletion (17 p-) often denote unsatisfactory response to the therapy and a short life expectancy.Alemtuzumab (anti-CD52) is effective in patients with unfavorable prognosis.