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FDA新药信息
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Dacogen Generic Name: decitabine Date of Approval: May 3, 2006 Company: MGI Pharma, Inc. and SuperGen, Inc. Treatment for: Myelodysplastic Syndromes -------------------------------------------------------------------------------- The U.S. Food and Drug Administration (FDA) has approved Dacogen (decitabine) for treatment of patients with myelodysplastic syndromes (MDS). Dacogen is indicated for treatment of patients with myelodysplastic syndromes (MDS) including previously treated and untreated, de novo, and secondary MDS of all French-American-British (FAB) subtypes (refractory anemia, refractory anemia with ringed sideroblasts, refractory anemia with excess blasts, refractory anemia with excess blasts in transformation, and chronic myelomonocytic leukemia), and Intermediate-1, Intermediate-2, and High-Risk International Prognostic Scoring System (IPSS) groups. MGI Pharma plans to make Dacogen commercially available during the second quarter of 2006. Results from a phase 3 clinical trial demonstrated an overall response rate of 21% in Dacogen-treated patients considered evaluable for response, defined as those patients with pathologically confirmed MDS at baseline who received at least 2 cycles of treatment, compared to 0% in the supportive care arm. All patients who responded to Dacogen treatment became or remained transfusion independent during the time of the response. The most commonly occurring adverse reactions with Dacogen include neutropenia, thrombocytopenia, anemia, pyrexia, fatigue, nausea, cough, petechiae, constipation, and diarrhea. It is recommended that patients be treated with Dacogen for a minimum of four cycles, and treatment may continue as long as the patient continues to benefit. Summary of Clinical Results SuperGen conducted a randomized open-label, multicenter, controlled trial that evaluated 170 adult patients with myelodysplastic syndromes meeting FAB classification criteria and IPSS High-Risk, Intermediate-2 and Intermediate-1 prognostic scores. Eighty-nine patients were randomized to Dacogen therapy plus supportive care, 83 of whom received Dacogen, and 81 were randomized to supportive care alone. Dacogen was intravenously infused at a dose of 15 mg/m2 over a 3-hour period, every eight hours, for three consecutive days. Dacogen therapy was repeated every 6 weeks, depending on the patient's clinical response and toxicity. Supportive care consisted of blood and blood product transfusions, prophylactic antibiotics, and hematopoietic growth factors. Co-primary endpoints of the study were overall response rate (complete responses plus partial responses) and time to acute myeloid leukemia (AML) or death. Secondary endpoints included hematologic improvement, duration of response, cytogenetic response rate, transfusion requirements, quality of life, survival, and safety. The overall response rate in the Dacogen study arm was 17% with a median response duration of 288 days, compared to 0% in the supportive care arm (p<0.001). A complete response rate of 9% and a partial response rate of 8% were observed in the Dacogen arm. The overall response rate was 21% in Dacogen-treated patients considered evaluable for response, defined as those patients with pathologically confirmed MDS at baseline who received at least 2 cycles of treatment. In addition, 13% of patients in the Dacogen arm had hematologic improvement, compared to 7% of patients in the supportive care arm. Two additional open label, single arm, multicenter studies were conducted to evaluate the safety and efficacy of Dacogen in patients with MDS of any FAB subtype. The results of the phase 2 studies were consistent with the results of the phase 3 trial with overall response rates of 26% (N=66) and 24% (N=98). Important Safety Information Dacogen may cause fetal harm when administered to a pregnant woman. Women of childbearing potential would be advised to avoid becoming pregnant while using Dacogen. Men should be advised not to father a child while receiving treatment with Dacogen and for 2 months afterwards. The most commonly occurring adverse reactions with Dacogen include neutropenia (90%), thrombocytopenia (89%), anemia (82%), pyrexia (53%), fatigue (48%), nausea (42%), cough (40%), petechiae (39%), constipation (35%), and diarrhea (34%). About Myelodysplastic Syndromes (MDS) Myelodysplastic syndromes, or MDS, are a group of diseases of the bone marrow characterized by the production of poorly functioning and immature blood cells. People with MDS may experience a variety of symptoms and complications, including anemia, bleeding, infection, fatigue and weakness. Those patients with high-risk MDS may experience bone marrow failure, which may lead to death from bleeding and infection. Over time, MDS can progress to acute leukemia, or AML. The Aplastic Anemia and MDS International Foundation currently estimates that up to 30,000 new cases of MDS are diagnosed annually in the United States. About Dacogen (Decitabine) For Injection Dacogen is a hypomethylating agent that is believed to exert its antineoplastic effects by incorporation into DNA and inhibition of an enzyme called DNA methyltransferase. Methylation is a process in which methyl (CH3) groups are added to DNA, resulting in the inactivation of genes that are critical for control of cellular differentiation and proliferation. Abnormal methylation, which silences certain genes, is associated with the development of many types of tumors. Dacogen-induced hypomethylation in neoplastic cells may restore normal function to genes that are critical for the control of cellular differentiation and proliferation. In rapidly dividing cells, the cytotoxicity of Dacogen may also be attributed to the formation of covalent adducts between DNA methyltransferase and decitabine incorporated into DNA. Non-proliferating cells are relatively insensitive to Dacogen. |
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