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Clinical Trial
Journal Article
Multicenter Study
Research Support, Non-U.S. Gov't
Subclonal TP53 copy number is associated with prognosis in multiple myeloma.
Blood 2018 December 7
Multiple myeloma (MM) is a genetically heterogeneous cancer of bone marrow plasma cells with variable outcome. To assess the prognostic relevance of clonal heterogeneity of TP53 copy number, we profiled tumors from 1777 newly diagnosed Myeloma XI trial patients with multiplex ligation-dependent probe amplification (MLPA). Subclonal TP53 deletions were independently associated with shorter overall survival, with a hazard ratio of 1.8 (95% confidence interval, 1.2-2.8; P = .01). Clonal, but not subclonal, TP53 deletions were associated with clinical markers of advanced disease, specifically lower platelet counts ( P < .001) and increased lactate dehydrogenase ( P < .001), as well as a higher frequency of features indicative of genomic instability, del(13q) ( P = .002) or del(1p) ( P = .006). Biallelic TP53 loss-of-function by mutation and deletion was rare (2.4%) and associated with advanced disease. We present a framework for identifying subclonal TP53 deletions by MLPA, to improve patient stratification in MM and tailor therapy, enabling management strategies.
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