Safety and Anti-Disease Activity of Oral Tosedostat (CHR-2797) in Elderly Subjects With Refractory or Relapsed AML
The OPAL Study: A Phase II Study to Evaluate the Efficacy, Safety and Tolerability of Tosedostat (CHR-2797) in Elderly Subjects With Treatment Refractory or Relapsed Acute Myeloid Leukemia
  • Phase

    Phase 2
  • Study Type

  • Status

    Completed No Results Posted
  • Indication/Condition

    AML ...
  • Intervention/Treatment

    tosedostat ...
  • Study Participants

The purpose of this study is to evaluate the efficacy and safety of tosedostat in elderly patients suffering from refractory or relapsed AML.
There is an urgent need for novel compounds and treatment strategies for elderly patients with AML, particularly those with refractory or relapsed disease for whom there are few effective treatment options. Treatment options for elderly patients are further limited by co-morbidity and tolerability constraints.

Tosedostat is a new aminopeptidase inhibitor, which in preclinical experiments has shown potent activity in both in vitro and in vivo cancer models as a single agent. In early clinical studies particularly good results have been observed in refractory and relapsed AML in older patients and these observations form the basis for the current study.

This multi-center, open label phase II study will enrol approximately 70 subjects in Part A and 130 subjects in Part B.
Study Started
Oct 31
Primary Completion
Mar 31
Study Completion
Mar 31
Last Update
Jun 28

Drug Tosedostat

In Part A, approximately 70 subjects will be randomized to one of 2 dose regimens of tosedostat which will be administered orally, once daily. The dose regimens of tosedostat will be: 120 mg for 6 months once daily, OR 240 mg (induction dose) once daily for 2 months, followed by 120 mg(maintenance dose) for 4 months In Part B a further 130 subjects will receive the dose regimen of tosedostat identified in Part A as being appropriate, based on the interim analysis during Part A.

  • Other names: - CHR-2797, - Aminopeptidase inhibitor

Tosedostat Experimental

oral, once daily administration of tosedostat to evaluate its efficacy, safety and tolerability



Signed, informed consent prior to any study specific procedure

Subjects with a confirmed diagnosis of AML according to WHO classification (excluding APL) who have had either a first CR lasting less than 12 months, or have not had a first CR and who will receive their first salvage therapy in this study [6]. For the purposes of this study, the following considerations apply:

Subjects should have received only 1 induction course, but this may have consisted of more than one cycle of treatment, with different agents or doses in each cycle
Induction courses should normally have consisted of agents and doses considered as standard of care for induction at the investigational site concerned
Subjects may have received consolidation for any number of cycles. Consolidation will be considered as any regimens given while the subject was in remission
Subjects who received hematopoietic stem cell transplant in first remission are eligible provided there has been no chemotherapy or other targeted therapies to treat a relapse, and there is no evidence of Graft Versus Host Disease (GVHD). Donor leukocyte infusion is allowed provided there is no evidence of hematologic relapse as defined by the International Working Group (IWG) [12]
Subject's peripheral blast count does not exceed 30,000/microlitre before randomization into the study. Hydroxyurea treatment or leukapheresis may be used prior to or during the screening period to achieve this - see Section 6.7.2.
Subject's life expectancy at randomization is judged to be at least 3 months
Subjects should have recovered from the adverse effects of prior therapies to grade ≤1 (according to CTCAE v3) (excluding alopecia and any adverse effects that are expected to be chronic and stable)
Subjects must have had a bone marrow aspiration performed within 28 days prior to randomization showing the subject has at least 5% blasts and is therefore neither in CR nor CRp. This may be done at the Screening Visit if appropriate and feasible

Subjects must have adequate hepatic and renal function including the following:

Total bilirubin ≤ 1.5 x upper limit of normal (in the absence of Gilbert's syndrome)
AST and ALT ≤ 2.5 x upper limit of normal
Serum creatinine ≤ 1.5 x upper limit of normal
Age ≥ 60 years
Performance status ≤ 2 (ECOG scale)
Screening left ventricular ejection fraction (LVEF) ≥ 50%
Subject is able to comply with all study procedures during the study including all visits and tests
Male subjects with female partners of reproductive potential must use acceptable contraceptive methods for the duration of time on study and continue to do so for a further 3 months after the end of tosedostat treatment


Subjects who have received prior therapy for first relapse or refractory disease (a second induction cycle within a single induction regimen is allowed as defined above in Inclusion criterion 2)
Anti-cancer therapy including chemotherapy, radiotherapy, endocrine therapy, immunotherapy or use of any other investigational agents within 2 weeks prior to randomization (with the exception of hydroxyurea which can be used in certain circumstances. Section 6.7.2)
Subjects with APL (FAB type M3) or CML in blast crisis
Any prior or co-existing medical condition that in the Investigator's judgment will substantially increase the risk associated with the subject's participation in the study
Psychiatric disorders or altered mental status precluding understanding of the informed consent process and/or completion of the necessary study procedures

Significant* cardiovascular disease defined as:

Congestive heart failure NYHA class 4
Unstable angina pectoris
History of myocardial infarction within 6 months prior to study entry
Presence of clinically significant valvular heart disease
Uncontrolled or clinically significant ventricular arrhythmia
Presence of clinically significant conduction defect on screening ECG
Uncontrolled hypertension (i.e., systolic BP >160mmHg, diastolic >90 mmHg in repeated measurements) despite adequate therapy
Clinically significant atrial fibrillation *Grade 3/4 in the CTCAE v3 grading would generally be considered clinically significant, although this remains a judgment for the Investigator to make.
Gastrointestinal disorders that may interfere with absorption of drug
Active serious infection or sepsis at randomization
Clinically significant interstitial lung disease
No Results Posted