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Blood, 15 October 2008, Vol. 112, No. 8, pp. 3088-3098. Prepublished online as a Blood First Edition Paper on June 17, 2008; DOI 10.1182/blood-2008-01-129783.
Submitted January 15, 2008
Department of Pathology & Laboratory Medicine, University of Wisconsin School of Medicine and Public Health, Madison, WI, United States * Corresponding author; email: khyoung{at}wisc.edu.
The purpose of this study is to correlate the presence of TP53 gene mutations with the clinical outcome of a cohort of patients with diffuse large B-cell lymphoma (DLBCL) assembled from 12 medical centers. TP53 mutations were identified in 102 of 477 patients and the overall survival (OS) of patients with TP53 mutations was significantly worse than those with wild-type TP53 (p=0.0006). However, subsets of TP53 mutations were found to have different effects on OS. Mutations in the TP53 DNA binding domains were the strongest predictors of poor OS (p=0.0003). Mutations in the Loop-Sheet-Helix and Loop-L3 were associated with significantly decreased OS (p=0.002), but OS was not significantly affected by mutations in Loop-L2. A subset of missense mutations (His158, His175, Ser245, Gln248, His273, Arg280 and Arg282) in the DNA binding domains had the worst prognosis. Multivariate analysis confirmed that the International Prognostic Index and mutations in the DNA binding domains were independent predictors of OS. TP53 mutations also stratified patients with germinal center B-cell-like DLBCL, but not non-germinal center B-cell-like DLBCL, into molecularly-distinct subsets with different survivals. This study demonstrates the prognostic importance of mutations in the TP53 DNA binding domains in patients with DLBCL.
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