Biomarkers in Samples From Young Patients With Acute Myeloid Leukemia

This study is ongoing, but not recruiting participants.
National Cancer Institute (NCI)
Information provided by (Responsible Party):
Children's Oncology Group Identifier:
First received: November 23, 2010
Last updated: May 11, 2015
Last verified: May 2015

RATIONALE: Studying bone marrow samples from patients with cancer in the laboratory may help doctors learn more about changes that occur in DNA and identify biomarkers related to cancer.

PURPOSE: This research study is studying biomarkers in samples from young patients with acute myeloid leukemia.

Condition Intervention
Genetic: DNA analysis
Genetic: mutation analysis
Genetic: polymerase chain reaction
Other: laboratory biomarker analysis

Study Type: Observational
Study Design: Observational Model: Case-Only
Time Perspective: Retrospective
Official Title: Telomere Length and Telomerase Mutations in Pediatric Acute Myeloid Leukemia

Resource links provided by NLM:

Further study details as provided by Children's Oncology Group:

Primary Outcome Measures:
  • Frequency of mutations [ Designated as safety issue: No ]
  • Relapse-free survival [ Designated as safety issue: No ]
  • Overall survival [ Designated as safety issue: No ]
  • Difference in telomere length [ Designated as safety issue: No ]

Biospecimen Retention:   Samples With DNA
bone marrow

Estimated Enrollment: 234
Study Start Date: November 2010
Estimated Primary Completion Date: January 2100 (Final data collection date for primary outcome measure)
Detailed Description:


  • To compare the frequency of germline telomerase mutations in pediatric patients with acute myeloid leukemia (AML) demonstrating prolonged myelosuppression, defined as ≥ 1 episode > 35 days of neutrophil count recovery after chemotherapy, to the pediatric patients with the expected myelosuppression, defined as consistently < 35 days of neutrophil count recovery after chemotherapy.
  • To assess association between telomerase mutations and incidence of grade 3 or 4 mucositis, relapse, and death.
  • To compare germline (remission) telomere length in pediatric AML patients demonstrating delayed bone marrow recovery with the pediatric patients with consistently expected recovery.
  • To assess whether a correlation between telomere length and incidence of grade 3 or 4 mucositis, relapse, and death exist.

OUTLINE: This is a multicenter study.

Cryopreserved bone marrow samples are analyzed for DNA sequencing and mutation by Sanger-based sequencing methods, quantitative PCR, and SeqMan Pro (Lasergene from DNAStar). Results are then compared with previously published data and existing databases to determine the allele frequency in control populations.


Ages Eligible for Study:   up to 21 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
Diagnosis of acute myeloid leukemia.


  • Diagnosis of acute myeloid leukemia
  • Enrolled on CCG-2961 and meeting 1 of the following criteria:

    • More than 35 days to recover to an ANC > 500/mm³ after any course of chemotherapy
    • Consistently recovered < 35 days to an ANC > 500/mm³ after all courses of chemotherapy
  • Available cryopreserved cell from diagnostic and end-of-therapy samples


  • Not specified


  • See Disease Characteristics
  Contacts and Locations
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Please refer to this study by its identifier: NCT01247584

Sponsors and Collaborators
Children's Oncology Group
National Cancer Institute (NCI)
Principal Investigator: Maria M. Gramatges, MD Texas Children's Hospital
  More Information

Additional Information:
Responsible Party: Children's Oncology Group Identifier: NCT01247584     History of Changes
Other Study ID Numbers: AAML11B2  COG-AAML11B2  NCI-2011-02846  AAML11B2 
Study First Received: November 23, 2010
Last Updated: May 11, 2015
Health Authority: United States: Federal Government

Keywords provided by Children's Oncology Group:
childhood acute myeloid leukemia/other myeloid malignancies
childhood acute erythroleukemia (M6)
childhood acute megakaryocytic leukemia (M7)
childhood acute monoblastic leukemia (M5a)
childhood acute monocytic leukemia (M5b)
childhood acute myeloblastic leukemia without maturation (M1)
childhood acute myelomonocytic leukemia (M4)
childhood acute myeloblastic leukemia with maturation (M2)

Additional relevant MeSH terms:
Leukemia, Myeloid
Leukemia, Myeloid, Acute
Neoplasms by Histologic Type processed this record on May 02, 2016