Clofarabine Plus Cytarabine in Patients With Previously Untreated Acute Myeloid Leukemia and High-risk Myelodysplastic Syndrome
A Phase II Study of Clofarabine in Combination With Cytarabine (Ara-C) in Patients >/= 50 Years With Newly Diagnosed and Previously Untreated Acute Myeloid Leukemia (AML) and High-risk Myelodysplastic Syndrome (MDS) (>/= 10% Bone Marrow Blasts)
調査の概要
詳細な説明
The treatment of acute myeloid leukemia (AML) in older patients has not improved significantly in recent years when compared with the considerable progress that has been made in younger patients. Hence, new drugs and approaches are needed in this poor-prognosis group of patients with AML.
Nucleoside analogs are among the most active antileukemic agents available. Clofarabine was synthesized as a rational extension of the experience with other deoxyadenosine analogs. Clofarabine is converted to the monophosphate form by the enzyme deoxycytidine kinase which represents the major metabolite of clofarabine. Phosphorylation of clofarabine is substantially more efficient than that of other nucleosides such as fludarabine and so is intracellular retention of the triphosphate form of clofarabine. Mechanisms of action include inhibition of DNA synthesis, inhibition of DNA polymerases, and potent inhibition of ribonucleotide reductase (RNR) resulting in depletion of normal nucleotides and increased DNA uptake of the analog. Single agent clofarabine has shown activity in phase I studies in AML and ALL. As a potent inhibitor of RNR, however, clofarabine is ideal to be incorporated into biochemical modulation strategies such as have been tested and validated with fludarabine and ara-C in AML. By combining clofarabine with ara-C, inhibition of RNR by clofarabine will result in a drop of deoxynucleotides causing a decrease in the feedback inhibition of deoxycytidine kinase which is the rate-limiting step in the synthesis of ara-CTP leading to increased retention of ara-CTP. Therefore, the activity of clofarabine and ara-C in leukemic cells would be complemented by a biochemical synergism between these agents that should result in better clinical efficacy. We have established the safety of the combination in salvage patients with acute leukemias.
研究の種類
入学 (実際)
段階
- フェーズ2
連絡先と場所
研究場所
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Texas
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Houston、Texas、アメリカ、77030
- The University of Texas M.D. Anderson Cancer Center
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参加基準
適格基準
就学可能な年齢
健康ボランティアの受け入れ
受講資格のある性別
説明
Inclusion Criteria:
- Previously untreated acute myeloid leukemia (AML) or high-risk myelodysplastic syndrome (MDS) (> 10% blasts). Prior therapy with hydroxyurea, single agent chemotherapy (e.g. decitabine), hematopoietic growth factors, biological or "targeted" therapies are allowed.
- Age > 50 years to < 74 years (diploid cytogenetics) and < 69 years (abnormal cytogenetics).
- ECOG performance status </= 2.
- Sign a written informed consent form.
- Adequate liver function (total bilirubin < 2mg/dL, SGPT or SGOT < x 4 ULN) and renal function (serum creatinine < 2mg/dL).
- Male and female patients who are fertile agree to use an effective barrier method of birth control (ie, latex condom, diaphragm, cervical cap, etc) to avoid pregnancy. Female patients need a negative serum or urine pregnancy test within 7 days of study enrollment (applies only if patient is of childbearing potential. Non-childbearing is defined as >= 1 year postmenopausal or surgically sterilized).
- Patients who are considered to require immediate induction (rapidly rising WBC >/= 50,000 and/or organ involvement as per the assessment of the treating physician) can be treated without final cytogenetic results and pretreatment assessment of cardiac ejection fraction (MUGA or echocardiogram) if by history and physical examination patients have </= NYHA class II disease.
Exclusion Criteria:
- AML with the following cytogenetic abnormalities: t(15;17), t(8;21), inv(16). Cytogenetic results do not need to be available if immediate induction is required (see inclusion #7).
- Cardiac ejection fraction < 30%. Pretreatment assessment of ejection fraction is not necessary if immediate induction is required as long as by history and physical examination patients have </= NYHA class II disease (see inclusion #7).
- Active and uncontrolled infection or any other severe concurrent disease considered life-threatening, or which, in the judgement of the investigator and after discussion with the Principal Investigator, would make the patient inappropriate for entry into the study.
研究計画
研究はどのように設計されていますか？
デザインの詳細
- 主な目的：処理
- 割り当て：非ランダム化
- 介入モデル：単一グループの割り当て
- マスキング：なし（オープンラベル）
協力者と研究者
捜査官
- 主任研究者：Stefan Faderl, MD、M.D. Anderson Cancer Center
出版物と役立つリンク
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研究の完了 (実際)
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本研究に関する用語
キーワード
追加の関連 MeSH 用語
その他の研究ID番号
- ID03-0139
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