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Clinical Trial Summary

RATIONALE: Gathering information about patients with childhood hematologic cancer or aplastic anemia treated with dapsone may help doctors learn more about risk factors for developing methemoglobinemia.

PURPOSE: This phase I trial is studying methemoglobinemia in patients with childhood hematologic cancer or aplastic anemia treated with dapsone.


Clinical Trial Description

OBJECTIVES:

Primary

- Determine host-related risk factors for developing symptomatic methemoglobinemia in patients with pediatric hematologic malignancies or aplastic anemia who received dapsone prophylaxis for pneumocystis carinii.

- Determine whether a deficiency in cytochrome b5 reductase is a risk factor for symptomatic methemoglobinemia in a subset of these patients.

Secondary

- Collect a genomic DNA specimen from a subset of patients for whom enzyme testing is being conducted to store for future analyses of variations in the genes responsible for cytochrome b5 reductase.

OUTLINE: Patients' medical records are reviewed for possible risk factors (e.g., age, sex, and body mass index) for developing symptomatic methemoglobinemia.

A subset of patients undergo blood sample collection for analysis of cytochrome b5 reductase levels. DNA samples are also collected from these patients for future genetic polymorphism studies. ;


Study Design

N/A


Related Conditions & MeSH terms


NCT number NCT00960050
Study type Observational
Source National Cancer Institute (NCI)
Contact
Status Active, not recruiting
Phase Phase 1
Start date June 2009

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