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Articles by B Wong
Total Records ( 3 ) for B Wong
  O. B Goodman , L. M Fink , J. T Symanowski , B Wong , B Grobaski , D Pomerantz , Y Ma , D. C Ward and N. J. Vogelzang
 

Purpose: Circulating tumor cells (CTC) have been recently accepted by the Food and Drug Administration of the United States as a prognostic tool in advanced prostate cancer. However, a number of questions remain about the use of the test. The optimal clinical cut-off has never been determined. Also, the predictive value of CTCs in the setting of low-burden advanced prostate cancer has not been evaluated. Herein we describe our experience with the CellSearch method of CTC enumeration.

Experimental Design: CTCs enumerated from 100 patients with castration-resistant prostate cancer were correlated with clinicopathologic characteristics and conventional biomarkers, such as prostate-specific antigen and lactate dehydrogenase. Patients received ongoing medical oncologic follow-up for up to 26 months, and overall survival status was documented.

Results: Forty-nine of the patients (49%) were alive at the end of the study. CTC counts correlate well with overall survival (P < 0.001) but are also tightly interrelated to other biomarkers. Threshold analysis identified 4 CTC/7.5 cc (compared with the approved value of 5) as an optimal cut-off value with respect to correlation with survival outcomes as well as predictive of metastatic disease. Univariate analysis confirmed a tight interrelationship between cut-off CTC values and biomarkers. Multivariate analysis with bootstrap sampling validation identified lactate dehydrogenase (P = 0.002) and CTCs (P = 0.001) as independently prognostically significant.

Conclusions: Baseline CTC values provide important prognostic information and specific prediction of metastatic disease. Their presence correlates with classic biomarkers. (Cancer Epidemiol Biomarkers Prev 2009;18(6):1904–13)

  Z Yang , B. H Funke , L. H Cripe , G. W Vick , D Mancini Dinardo , L. S Pena , R. J Kanter , B Wong , B. H Westerfield , J. J Varela , Y Fan , J. A Towbin and M. Vatta
 

Background— Danon disease is an X-linked dominant disorder characterized by the clinical triad of hypertrophic cardiomyopathy, skeletal myopathy, and variable mental retardation. Pathologically, autophagic vacuoles are noted in both skeletal and cardiac muscle. It exhibits an X-linked dominant mode of inheritance, and male carriers are severely affected, whereas female carriers develop milder and later-onset cardiac symptoms. Danon disease has been associated with mutations in the lysosome-associated membrane glycoprotein 2 (LAMP2) gene located at Xq24, typically resulting in splicing defects or protein truncation affecting the LAMP2. Because of its rarity, the full spectrum of genetic mutation resulting in Danon disease has not been elucidated.

Methods and Results— We analyzed 3 male cases with clinical and pathological findings consistent with Danon disease. Comprehensive mutational analysis failed to yield detectable products for selected LAMP2 exons, and genomic DNA deletion was suspected. Genomic junction fragment polymerase chain reaction analysis in case 1 identified a novel Alu-mediated 34-kb microdeletion encompassing the entire 5'-untranslated region and exon 1 of LAMP2. In case 2 and 3, junctional polymerase chain reaction and Southern blot analyses mapped the breakpoint to an MIRb and (TA)n simple repeats present in intron 3, which determined a 64-kb and a 58-kb deletion, respectively, thereby ablating exons 4 to 10. Western blot analysis confirmed the absence of LAMP2 in protein extract from lymphocytes of index case 2.

Conclusion— This article is the first report of Danon disease caused by microdeletions at Xq24, which functionally ablate LAMP2. The microdeletion mechanism appears to involve 1 Alu-mediated unequal recombination and 2 chromosomal breakage points involving TA-rich repeat sequences.

  K. G Cloyes , B Wong , S Latimer and J. Abarca
 

Serious mental illness (SMI) represents a major risk for repeated incarceration, yet recidivism studies often do not specifically focus on persons with SMI as compared to non-SMI offenders. The study reported here systematically identified Utah State prisoners released from 1998 to 2002 (N = 9,245) who meet criteria for SMI and compared SMI and non-SMI offenders on length of time to prison return. Findings indicate that 23% of the sample met criteria for SMI (n = 2,112). Moreover, survival analyses demonstrated a significant difference in return rates and community tenure for offenders with SMI compared to non-SMI offenders when controlling for demographics, condition of release, offense type, and condition of return (parole violation vs. new commitment). The median time for all SMI offenders to return to prison was 385 days versus 743 days for all non-SMI offenders, 358 days sooner (p < .001). Implications of these findings are discussed.

 
 
 
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