LeukemiaNCT00899899
Resistance to Methotrexate in Patients With Acute Lymphoblastic Leukemia in Relapse or Remission
An observational study of Leukemia, run by Children's Oncology Group.
Trial summary
RATIONALE: Studying samples of blood from patients with cancer in the laboratory may help doctors learn more about cancer and the development of drug resistance in patients. PURPOSE: This laboratory study is looking at resistance to methotrexate in patients with acute lymphoblastic leukemia in relapse or remission. Read more about this study
- Who is it for?
- Ages Up to 120 years
- Conditions the study is for
- Leukemia
- What is being tested?
- microarray analysis, reverse transcriptase-polymerase chain reaction and laboratory biomarker analysis
- How many people
- 135 participants
- Where
- No sites listed yet
- Study dates
- Jun 1998to Apr 2006
- Phase
- Observational
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages Up to 120 years
- All sexes
- No healthy volunteers
- Child, Adult, Older adult
Study population: Acute lymphoblastic leukemia (ALL) in relapse
DISEASE CHARACTERISTICS:
- Meets 1 of the following criteria:
- Acute lymphoblastic leukemia (ALL) in relapse, including all risk groups and leukemia subtypes, with frozen leukemic blast samples stored from the time of initial diagnosis and relapse
- Non-relapsing ALL (as control)
PATIENT CHARACTERISTICS:
- Not specified
PRIOR CONCURRENT THERAPY:
- Not specified
About this study
Official title: A Study of the Mechanisms of Intrinsic and Acquired Methotrexate Resistance in Acute Lymphocytic Leukemia
RATIONALE: Studying samples of blood from patients with cancer in the laboratory may help doctors learn more about cancer and the development of drug resistance in patients.
PURPOSE: This laboratory study is looking at resistance to methotrexate in patients with acute lymphoblastic leukemia in relapse or remission.
Read the detailed description
OBJECTIVES:
- Determine the mechanisms of intrinsic and acquired methotrexate resistance using in vitro assays of matched initial diagnosis, relapsed, and nonrelapsed (control) leukemic blast samples from patients with acute lymphoblastic leukemia in relapse or remission.
- Determine if the mechanisms of acquired methotrexate resistance are related to dosage or timing of methotrexate administration or other clinical factors in these patients.
OUTLINE: Random samples of frozen leukemic blasts from relapsing patients at initial diagnosis and relapse are selected. A corresponding sample from nonrelapsing patients (control) at initial diagnosis is also randomly selected.
Reduced folate carrier (RFC) and dehydrofolate reductase (DHFR) expression is measured using a quantitative reverse transcriptase-polymerase chain reaction assay of prepared RNA. DHFR gene amplification is measured by a dot blot analysis of prepared DNA. Results of these assays are used to determine if a particular mechanism of acquired methotrexate resistance is associated with a particular subset of acute lymphoblastic leukemia patients. Data are collected regarding the actual timing and dosage of methotrexate received by each patient and are correlated with the mechanisms of resistance.
PROJECTED ACCRUAL: A total of 135 paired samples will be accrued for this study.
- Conditions
- Leukemia
- Being tested
- microarray analysis, reverse transcriptase-polymerase chain reaction, laboratory biomarker analysis
- Keywords
- adult acute lymphoblastic leukemia in remission, childhood acute lymphoblastic leukemia in remission, recurrent adult acute lymphoblastic leukemia, recurrent childhood acute lymphoblastic leukemia
- Medical subject headings
- Leukemia, Precursor Cell Lymphoblastic Leukemia-Lymphoma
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
microarray analysisGenetic
reverse transcriptase-polymerase chain reactionGenetic
laboratory biomarker analysisOther
What is being measured
The primary outcome is the main question the study is designed to answer.
Mechanisms of intrinsic and acquired methotrexate resistance
Correlation of acquired methotrexate resistance with dosage or timing of methotrexate administration
Correlation of acquired methotrexate resistance with other clinical factors
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted12 May 2009 (estimated)
- Study startJun 1998
- Primary completionMar 2005
- Study completionApr 2006
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for LeukemiaStudies of the same condition, open and under way.
- More trials run by Children's Oncology GroupThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Case only
- Time perspective
- Retrospective
- Enrolment
- 135 participants (actual)
Sponsor and investigators
- Lead sponsor
- Children's Oncology Group
- Sponsor type
- Research network
- Collaborators
- National Cancer Institute (NCI)
- Responsible party
- Sponsor
- Investigators
- Richard Gorlick, MD, Study chair, Children's Hospital at Montefiore
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT00899899
- Sponsor's protocol ID
- B977
- Other IDs
- COG-B977, CDR0000078589
- Status last verified
- May 2015
- First submitted
- 9 May 2009
- Last updated
- 30 Sep 2015
- Results posted
- No
- Data monitoring committee
- No
Study at a glance
From the registry record, last updated by the sponsor on 30 Sep 2015. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- A Study of the Mechanisms of Intrinsic and Acquired Methotrexate Resistance in Acute Lymphocytic Leukemia
- ClinicalTrials.gov ID
- NCT00899899
- Acronym / sponsor ID
- B977
- Conditions
- Leukemia
- Keywords
- adult acute lymphoblastic leukemia in remission, childhood acute lymphoblastic leukemia in remission, recurrent adult acute lymphoblastic leukemia, recurrent childhood acute lymphoblastic leukemia
- Study type
- Observational
- Recruitment status
- Completed
- Enrolment
- 135 participants (actual)
- Lead sponsor
- Children's Oncology GroupResearch network
- Collaborators
- National Cancer Institute (NCI)
- Study start
- Jun 1998
- Primary completion
- Mar 2005 (actual)
- Study completion
- Apr 2006 (actual)
- First posted
- 12 May 2009 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
RATIONALE: Studying samples of blood from patients with cancer in the laboratory may help doctors learn more about cancer and the development of drug resistance in patients.
PURPOSE: This laboratory study is looking at resistance to methotrexate in patients with acute lymphoblastic leukemia in relapse or remission.
Detailed description
OBJECTIVES:
- Determine the mechanisms of intrinsic and acquired methotrexate resistance using in vitro assays of matched initial diagnosis, relapsed, and nonrelapsed (control) leukemic blast samples from patients with acute lymphoblastic leukemia in relapse or remission.
- Determine if the mechanisms of acquired methotrexate resistance are related to dosage or timing of methotrexate administration or other clinical factors in these patients.
OUTLINE: Random samples of frozen leukemic blasts from relapsing patients at initial diagnosis and relapse are selected. A corresponding sample from nonrelapsing patients (control) at initial diagnosis is also randomly selected.
Reduced folate carrier (RFC) and dehydrofolate reductase (DHFR) expression is measured using a quantitative reverse transcriptase-polymerase chain reaction assay of prepared RNA. DHFR gene amplification is measured by a dot blot analysis of prepared DNA. Results of these assays are used to determine if a particular mechanism of acquired methotrexate resistance is associated with a particular subset of acute lymphoblastic leukemia patients. Data are collected regarding the actual timing and dosage of methotrexate received by each patient and are correlated with the mechanisms of resistance.
PROJECTED ACCRUAL: A total of 135 paired samples will be accrued for this study.
Study design
- Observational model
- Case only
- Time perspective
- Retrospective
Who may qualify
- Ages
- Up to 120 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Child, Adult, Older adult
- Study population
- Acute lymphoblastic leukemia (ALL) in relapse
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| microarray analysis | Genetic | – |
| reverse transcriptase-polymerase chain reaction | Genetic | – |
| laboratory biomarker analysis | Other | – |
Primary outcome
Mechanisms of intrinsic and acquired methotrexate resistance
Correlation of acquired methotrexate resistance with dosage or timing of methotrexate administration
Correlation of acquired methotrexate resistance with other clinical factors
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 30 Sep 2015.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Richard Gorlick, MD study chair
Children's Hospital at Montefiore
Questions about this trial
What is this clinical trial studying?
An observational study of Leukemia, run by Children's Oncology Group.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 30 Sep 2015. Status can change between updates, so confirm with the study contact before making plans.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Mechanisms of intrinsic and acquired methotrexate resistance. The study lists 3 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 30 Sep 2015.