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Articles by S Xu
Total Records ( 2 ) for S Xu
  L Chen , S Xu , X Zeng , J Li , W Yin , Y Chen , Z Shao and W. Jin

Chemokine C-X-C motif ligand 12 (CXCL12) is a potent chemotactic and angiogenic factor that has been proposed to play a role in organ-specific metastasis and angiogenic activity in several malignancies. In this study, we found that the overexpression of c-myb could elevate CXCL12 mRNA level and CXCL12 promoter activity in human T47D and MCF-7 breast cancer cells. Chromatin immunoprecipitation assay demonstrated that c-myb could bind to the CXCL12 promoter in the cells transfected with c-myb expression vector. c-myb siRNA attenuated CXCL12 promoter activity and the binding of c-myb to the CXCL12 promoter in T47D and MCF-7 cells. These results indicated that c-myb could activate CXCL12 promoter transcription.

  T. T Tsai , P. M Ho , S Xu , J. D Powers , N. M Carroll , S. M Shetterly , T. M Maddox , J. S Rumsfeld , K Margolis , A. S Go and D. J. Magid

Studies suggest that extended clopidogrel use after drug-eluting stent (DES) implantation may decrease the risk of myocardial infarction (MI) and death. Little is known about the competing risk of bleeding from clopidogrel in "real world" clinical practice.

Methods and Results—

We studied 7689 patients undergoing drug-eluting stent implantation enrolled in the HMO Research Network-Stent Registry between 2004 and 2007. Patients were analyzed in 6-month intervals for the occurrence of major bleeding, MI, and death. Clopidogrel use was determined by pharmacy dispensing data. Regression models assessed the association between clopidogrel use and outcomes. Overall, 3603 patients (49.1%) received clopidogrel for >6 months. During a mean follow-up of 418 days (SD, ±168 days), 217 (2.9%) patients died, 279 (3.7%) had a MI, and 271 (3.6%) had major bleeding. After adjustment, patients on clopidogrel therapy were associated with increased major bleeding in all time intervals (0 to 6 months: relative risk (RR)=2.70, 95% CI=1.41 to 5.19; 7 to 12 months: RR=1.71, 95% CI=1.05 to 2.79; 13 to 18 months: RR=2.34, 95% CI=1.26 to 4.34), compared with patients off clopidogrel. Clopidogrel use was also associated with decreased risk of MI for all time intervals (0 to 6 months: RR=0.52, 95% CI=0.36 to 0.77; 7 to 12 months: RR=0.46, 95% CI=0.30 to 0.70; 13 to 18 months: RR=0.53, 95% CI=0.29 to 0.99) and decreased death in the 7 to 12 month interval (RR=0.50, 95% CI=0.30 to 0.83).


Clopidogrel use was associated with increased major bleeding and decreased MI persisting to 18 months. Bleeding risks on clopidogrel therapy deserve consideration in the ongoing debate regarding optimal clopidogrel duration after PCI.

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