title: Clinical significance of p53 mutations in relapsed T-cell acute lymphoblastic leukemia.
abstract: In T-cell acute lymphoblastic leukemia (T-ALL), p53 gene mutations were found in 12 of 51 patients in first relapse (24%). In a retrospective study, bone marrow samples at diagnosis were obtained from 9 of the 12 relapsed patients with p53 mutation; only one patient was found to harbor a p53 mutation at diagnosis. No further p53 mutations were identified in 18 unpaired diagnosis T-ALL samples. This is the first report of a p53 mutation in T-ALL at diagnosis. p53 mutations in relapsed T-ALL were clinically relevant. Patients with p53 mutations experience a shorter duration of survival than those patients without p53 mutations. Additionally, patients with p53 mutations were significantly less likely to have achieved a complete second remission from reinduction therapy than those patients without p53 mutations and experience a shorter duration of survival from relapse even when a second reinduction is obtained. Though primarily identified only at relapse, p53 mutations were also associated with a decreased duration of first remission and overall decrease in survival from diagnosis. Patients with p53 mutations had a 3.8-fold increase in risk of death than those patients without p53 mutations. These findings suggest that p53 mutation is associated with poor clinical outcome that is characterized by (1) a shortened duration of survival after first relapse; (2) a reduced response to reinduction therapy; (3) a shortened duration of first remission; and, hence, (4) an overall decreased duration of survival and increased risk of death.
authors.affiliation: Department of Pediatrics, University of California, San Diego.
authors.forename: M B
authors.initials: MB
authors.lastname: Diccianni
authors.forename: J
authors.initials: J
authors.lastname: Yu
authors.forename: M
authors.initials: M
authors.lastname: Hsiao
authors.forename: S
authors.initials: S
authors.lastname: Mukherjee
authors.forename: L E
authors.initials: LE
authors.lastname: Shao
authors.forename: A L
authors.initials: AL
authors.lastname: Yu
mesh_terms: D001483:Base Sequence; D017931:DNA Primers / Q000737:chemistry; D004273:DNA, Neoplasm / Q000235:genetics; D016158:Genes, p53; D006801:Humans; D008969:Molecular Sequence Data; D017354:Point Mutation; D018807:Polymorphism, Single-Stranded Conformational; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000175:diagnosis / Q000235:genetics*; D011379:Prognosis; D012008:Recurrence; D016019:Survival Analysis
chemical_list: D017931:DNA Primers; D004273:DNA, Neoplasm