Resistance to Methotrexate in Patients With Acute Lymphoblastic Leukemia in Relapse or Remission
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.
Studieoversikt
Status
Forhold
Detaljert beskrivelse
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.
Studietype
Registrering (Faktiske)
Deltakelseskriterier
Kvalifikasjonskriterier
Alder som er kvalifisert for studier
Tar imot friske frivillige
Kjønn som er kvalifisert for studier
Prøvetakingsmetode
Studiepopulasjon
Beskrivelse
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
Studieplan
Hvordan er studiet utformet?
Designdetaljer
Hva måler studien?
Primære resultatmål
Resultatmål |
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Mechanisms of intrinsic and acquired methotrexate resistance
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Correlation of acquired methotrexate resistance with dosage or timing of methotrexate administration
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Correlation of acquired methotrexate resistance with other clinical factors
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Samarbeidspartnere og etterforskere
Sponsor
Samarbeidspartnere
Etterforskere
- Studiestol: Richard Gorlick, MD, Children's Hospital at Montefiore
Studierekorddatoer
Studer hoveddatoer
Studiestart
Primær fullføring (Faktiske)
Studiet fullført (Faktiske)
Datoer for studieregistrering
Først innsendt
Først innsendt som oppfylte QC-kriteriene
Først lagt ut (Anslag)
Oppdateringer av studieposter
Sist oppdatering lagt ut (Anslag)
Siste oppdatering sendt inn som oppfylte QC-kriteriene
Sist bekreftet
Mer informasjon
Begreper knyttet til denne studien
Nøkkelord
Ytterligere relevante MeSH-vilkår
Andre studie-ID-numre
- B977
- COG-B977 (Annen identifikator: Children's Oncology Group)
- CDR0000078589 (Annen identifikator: Clinical Trials.gov)
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