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Objectives: To demonstrate the efficacy of Gemtuzumab ozogamicin in refractory AML patients with organ dysfunctions and poor performance status. Three refractory AML patients with are described. One of them was pretreated by intensive chemotherapy, two other patients progressed during Azacitidine treatment. WHO performance status III . Two patients had respiratory failure grade 2, the other one suffered from acute kidney insufficiency. Two patients were highly febrile with elevated CRP level. Gemtuzumab ozogamicin administration was performed in three patients followed by further switch to Gemtuzumab ozogamicin + Azacitidine or “7+3” treatment. Results: Gemtuzumab ozogamicin administration resulted in abrupt fever cessation in two febrile patients simultaneously with CRP level decrease and fast gradual resolution of respiratory failure. Recovery of kidney function was noticed in patient with renal insufficiency. WHO performance status have elevated in all three patients. No adverse effects grade II-III were noticed. Further treatment made two patients eligible for intensive chemotherapy, one patient was transplanted, patient with kidney failure obtained complete remission. Conclusions: Gemtuzumab ozogamicin therapy appeared to be safe and highly efficacious in relapsed/refractory AML patients with organ dysfunctions and poor performance status.

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