The Moment Humans And Ponatinib Wage War

R. Pettitt.1 1Department of Molecular and Clinical Cancer Medicine, University http://www.selleckchem.com/products/jq1.html of Liverpool, Liverpool, UK; 2Cheshire and Merseyside Genetics Laboratories, Liverpool Women's Hospital, Liverpool, UK. Introduction: TP53 mutation/deletion is strongly associated with adverse outcome in chronic lymphocytic leukaemia (CLL) and is accompanied by the under-expression of mRNA encoding TP53 and other genes on chromosome 17p (Lin et al, Br J Haemtol 2013;160:53). We speculated that TP53 mRNA levels might be reduced in other patients through alternative mechanisms, resulting in reduced p53 protein expression and adverse clinical outcome. Methods: TP53 mRNA levels were measured by RT-qPCR in 104 CLL samples (including 15 with TP53 deletion and/or mutation) and related to p53 protein levels measured by flow cytometry, 13q14 copy number measured by FISH, overall survival (OS) and treatment-free survival (TFS). miR-15a and miR-16-1 levels were measured by qPCR in 12 CLL samples selected on the basis of high or low 13q14 copy number. Results: TP53 mRNA levels varied widely among the 104 CLL samples analysed and were markedly increased in 18 samples (17%), all without TP53 deletion/mutation. The latter cases had a shorter OS (p?=?0.048) and TFS (p?=?0.057) compared with those with lower TP53 mRNA levels and no TP53 mutation/deletion. Furthermore, there was no correlation between TP53 mRNA levels and p53 protein expression. We speculated that the adverse outcome associated http://www.selleck.cn/products/AP24534.html with high TP53 mRNA levels might reflect variation in the expression of miR-15a and miR-16-1 which are encoded at the minimum deleted region at 13q14 and include TP53 among their targets. In keeping with our hypothesis, 13q14 copy number correlated negatively with TP53 mRNA levels (r?=??0.43, p? http://www.selleckchem.com/products/Rapamycin.html whereas the latter correlated negatively with TP53 mRNA levels (r?=??0.63, p?=?0.027 and r?=??0.51, p?=?0.094, respectively). Conclusion: TP53 mRNA levels vary widely between individual CLL samples, high levels being associated with low 13q14 copy number, reduced levels of miR-15a/miR-16-1 and short survival. The adverse outcome associated with high TP53 mRNA levels most likely results from deletion of tumour suppressor genes at 13q14 and/or reduced miR-15a/miR-16-1 expression with consequent loss of oncogene repression. SESSION 3��ADVANCES IN THE CLINICAL MANAGEMENT OF CLL 055 DEVELOPMENT OF A COMPREHENSIVE PROGNOSTIC INDEX FOR PATIENTS WITH CHRONIC LYMPHOCYTIC LEUKAEMIA (CLL) J. Bahlo,1 N. Pflug,1 T. Shanafelt,2 B. F. Eichhorst,1 M. A. Bergmann,3 T. Elter,1 K. Bauer,4 G. Malchau,5 K. G. Rabe,6 S. Stilgenbauer,3 H. Doehner,3 U. Jaeger,7 M. J. Eckart,8 G. Hopfinger,9 R. Busch,10 A. Fink,1 C. Wendtner,11 K. Fischer,1 N. E. Kay,2 M. Hallek.