Acute tumour lysis syndrome after oral fludarabine in a patient with chronic lymphocytic leukaemia

Acute tumour lysis syndrome (TLS) is a very rare complication of cytotoxic therapy in patients with chronic lymphocytic leukaemia (CLL). We report a patient with CLL who developed tumour lysis syndrome twice after oral fludarabine therapy. Both times TLS developed more than 2 weeks after the initiation of therapy. To our knowledge this is the first reported case of TLS in CLL precipitated by oral fludarabine.