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Blood, 1 March 2006, Vol. 107, No. 5, pp. 2200-2207. Prepublished online as a Blood First Edition Paper on November 22, 2005; DOI 10.1182/blood-2005-06-2338.
Submitted June 13, 2005
Clinical Research Division and Public Health Science Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA * Corresponding author; email: jchien{at}fhcrc.org.
Innate immunity is involved in the biology of graft versus host disease and common airways diseases. We screened 15 genes in this pathway using a haplotype approach to identify potential candidate genes that may be involved in the development of airflow obstruction after hematopoietic cell transplant. Sixty-nine haplotype tagging single nucleotide polymorphisms were selected for assessment in a discovery cohort (N=363). Significant associations were validated in a validation cohort (N=209). Expression of the candidate gene was demonstrated by detecting gene transcript and protein in malignant and normal small airway epithelial cells. In the discovery cohort, 133 patients developed significant airflow decline. Four patient and donor bactericidal permeability increasing (BPI) haplotypes were associated with a 2 to 3-fold increased risk for developing significant airflow decline (p-values 0.004 to 0.038). This association was confirmed in the validation cohort, which had 66 patients with significant airflow decline, with 9 significant haplotypes (p-values 0.013 to 0.043). BPI gene transcript and protein was detected in airway epithelial cells. These results suggest mutations in the BPI gene significantly influence the risk for developing rapid airflow decline after hematopoietic cell transplantation and may represent a novel therapeutic target for this form of airways disease.
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