Jong Y Park

Moffitt Cancer Center, Tampa, Florida, United States

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Publications (57)275.34 Total impact

  • Jong Y Park
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    ABSTRACT: There is increasing evidence that DNA methylation is a critical source of gene regulation. In addition, interindividual differences in DNA methylation status in cancer related genes are associated with risk and progression of prostate cancer. Therefore, DNA methylation in cancer related genes can be potential biomarkers and therapeutic targets for prostate cancer.In this chapter, current information on frequently hypermethylated genes associated with the carcinogenesis and progression of prostate cancer was updated. The potential biological role of hypermethylated genes in prostate cancer is discussed. These findings may provide new information of the pathogenesis, the exciting potential to be predictive and to provide strategies for personalized treatment of prostate cancer.
    Methods in molecular biology (Clifton, N.J.) 01/2015; 1238:607-25. · 1.29 Impact Factor
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    ABSTRACT: Tobacco smoking is a well-known cause of various diseases, however, its toxic mechanisms for diseases are not completely understood, yet. Therefore, we performed biological monitoring to find tobacco smoking-responsive mechanisms including oxidative stress in Korean men (N = 36). Whole genome microarray analyses were performed with peripheral blood from smokers and age-matched nonsmokers. We also performed qRT-PCR to confirm the microarray results and compared the gene expression of blood to those of buccal cells. To assess the effects of tobacco smoking on oxidative stress, we analyzed urinary levels of malondialdehyde (MDA), a lipid peroxidation marker, and performed PCR-based arrays on reactive oxygen species (ROS)-related genes. As results, 34 genes were differently expressed in blood between smokers and nonsmokers (ps < 0.01 and >1.5-fold change). Particularly, the genes involved in immune responsive pathways, e.g., the Fcγ-receptor mediated phagocytosis and the leukocyte transendothelial migration pathways, were differentially expressed between smokers and nonsmokers. Among the above genes, the ACTG1, involved in the maintenance of actin cytoskeleton, cell migration and cancer metastasis, was highly expressed by smoking in both blood and buccal cells. Concerning oxidative stress, smokers showed high levels of urinary MDA and down-regulation of expressions of antioxidant related genes including TPO, MPO, GPX2, PTGR1, and NUDT1 as compared to nonsmokers (ps < 0.05). In conclusion, these results suggest that systemically altered immune response and oxidative stress can be tobacco-responsive mechanisms for the related diseases. Based on consistent results in blood and buccal cells, expression of the ACTG1 can be a tobacco smoking-responsive biomarker.
    Toxicology Letters 11/2014; · 3.15 Impact Factor
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    ABSTRACT: Metastatic castrate resistant prostate cancer (mCRPC) is responsible for the majority of prostate cancer deaths with the median survival after diagnosis being 2 years. The metastatic lesions often arise in the skeleton, and current treatment options are primarily palliative. Using guidelines set forth by the National Comprehensive Cancer Network (NCCN), the medical oncologist has a number of choices available to treat the metastases. However, the sequence of those treatments is largely dependent on the patient history, treatment response and preferences. We posit that the utilization of personalized computational models and treatment optimization algorithms based on patient specific parameters could significantly enhance the oncologist's ability to choose an optimized sequence of available therapies to maximize overall survival. In this perspective, we used an integrated team approach involving clinicians, researchers, and mathematicians, to generate an example of how computational models and genetic algorithms can be utilized to predict the response of heterogeneous mCRPCs in bone to varying sequences of standard and targeted therapies. The refinement and evolution of these powerful models will be critical for extending the overall survival of men diagnosed with mCRPC.
    Clinical & experimental metastasis. 08/2014;
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    ABSTRACT: Genome-wide association studies have identified more than eighty risk variants for prostate cancer, mainly in European or Asian populations. The generalizability of these variants in other racial/ethnic populations needs to be understood before the loci can be utilized widely in risk modeling. In this study, we examined 82 previously reported risk variants in 4,853 prostate cancer cases and 4,678 controls of African ancestry. We performed association testing for each variant using logistic regression adjusted for age, study, and global ancestry. Of the 82 known risk variants, 68 (83%) had effects that were directionally consistent in their association with prostate cancer risk and 30 (37%) were significantly associated with risk at p<0.05, with the most statistically significant variants being rs116041037 (p=3.7×10(-26) ) and rs6983561 (p=1.1×10(-16) ) at 8q24, as well as rs7210100 (p=5.4×10(-8) ) at 17q21. By exploring each locus in search of better markers, the number of variants that captured risk in men of African ancestry (p<0.05) increased from 30 (37%) to 44 (54%). An aggregate score comprised of these 44 markers was strongly associated with prostate cancer risk (per-allele odds ratio (OR)=1.12, p=7.3×10(-98) ). In summary, the consistent directions of effects for the vast majority of variants in men of African ancestry indicate common functional alleles that are shared across populations. Further exploration of these susceptibility loci is needed to identify the underlying biologically relevant variants to improve prostate cancer risk modeling in populations of African ancestry. © 2014 Wiley Periodicals, Inc.
    International journal of cancer. Journal international du cancer. 07/2014;
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    ABSTRACT: The purpose of this study was to investigate the effects of mindfulness-based stress reduction for breast cancer survivors (MBSR(BC)) on multiple measures of objective and subjective sleep parameters among breast cancer survivors (BCS).
    Psycho-Oncology 06/2014; · 3.51 Impact Factor
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    ABSTRACT: Individuals with reduced attention and memory cognitive control-related processes may be motivated to smoke as a result of the cognitive enhancing effects of nicotine. Further, nicotine deprivation-induced reductions in cognitive control may negatively reinforce smoking. Minor allele carriers at rs16969968 in the nicotinic acetylcholine receptor α5 subunit gene (CHRNA5) have been shown to exhibit both reduced cognitive control and greater nicotine dependence. It is therefore of interest to see if variants in this gene moderate the influence of nicotine deprivation on cognitive control. P3b and P3a components of the event-related brain potential waveform evoked by a 3-stimulus visual oddball task are widely viewed as positive indices of cognitive control-related processes. We tested the hypothesis that individuals possessing at least one minor allele at rs16969968 in CHRNA5 would show greater nicotine deprivation induced reductions in P3b and P3a amplitude. The sample included 72 Non-Hispanic, Caucasian heavy smokers (54 men and 18 women) with a mean age of 36.11 years (SD = 11.57). Participants completed the visual oddball task during counterbalanced nicotine and placebo smoking sessions. Findings indicated that rs16969968 status did not moderate nicotine effects on P3b or P3a, whereas variation in other CHRNA5 SNPs, which are not as well characterized and are not in linkage disequilibrium with rs16969968, predicted nicotine deprivation induced reduction of P3a amplitude: rs588765 (F[1,68] = 7.74, p = 0.007) and rs17408276 (F[1,67] = 7.34, p = 0.009). Findings are interpreted in the context of vulnerability alleles which may predict nicotine effects on cognitive control.
    Genes Brain and Behavior 06/2014; · 3.60 Impact Factor
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    ABSTRACT: We report the association of an inherited variant located upstream of the poly (adenosine diphosphate-ribose) polymerase 1 (PARP1) gene (rs2249844), with survival in 11 BioGenoMEL melanoma cohorts. The gene encodes a protein involved in a number of cellular processes including single strand DNA repair. Survival analysis was conducted for each cohort using proportional hazards regression adjusting for factors known to be associated with survival. Survival was measured as overall survival (OS) and, where available, melanoma-specific survival (MSS). Results were combined using random effects meta-analysis. Evidence for a role for the PARP1 protein in melanoma ulceration and survival was investigated by testing gene expression levels taken from formalin-fixed paraffin-embedded tumors. A significant association was seen for inheritance of the rarer variant of PARP1, rs2249844 with OS (Hazard ratio (HR)=1.16 per allele, 95% confidence interval (CI) 1.04-1.28, p=0.005, 11 cohorts) and MSS (HR=1.20 per allele, 95%CI 1.01-1.39, p=0.03, 8 cohorts). We report bioinformatic data supportive of a functional effect for rs2249844. Higher levels of PARP1 gene expression in tumors were shown to be associated with tumor ulceration and poorer OS. © 2014 Wiley Periodicals, Inc.
    International Journal of Cancer 02/2014; · 6.20 Impact Factor
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    ABSTRACT: Background:Prostate cancer treatment is often accompanied by untoward side effects. Therefore, chemoprevention to reduce the risk and inhibit the progression of prostate cancer may be an effective approach to reducing disease burden. We investigated the safety and efficacy of Polyphenon E, a green tea extract, in reducing the progression of prostate cancer in TRAMP mice. 119 male TRAMP and 119 C57BL/6J mice were treated orally with one of three doses of Polyphenon E (200, 500, 1,000 mg/kg/day) in drinking water ad libitum replicating human achievable doses. Baseline assessments were performed prior to treatments. Safety and efficacy assessments during treatments were performed when mice were 12, 22 and 32 weeks old. The number and size of tumors in treated TRAMP mice were significantly decreased compared to untreated animals. In untreated 32 weeks old TRAMP mice, prostate carcinoma metastasis to distant sites was observed in 100% of mice (8/8), compared to 13% of mice (2/16) treated with high dose Polyphenon E during the same period. Further, Polyphenon E treatment significantly inhibited metastasis in TRAMP mice in a dose-dependent manner (P=0.0003). Long-term (32 weeks) treatment with Polyphenon E was safe and well tolerated with no evidence of toxicity in C57BL/6J mice. Polyphenon E is an effective chemopreventive agent in preventing the progression of prostate cancer to metastasis in TRAMP mice. Polyphenon E showed no toxicity in these mouse models. Impact: Our findings provide additional evidence for the safety and chemopreventive effect of Polyphenon E in preventing progression of PCa.
    Cancer Prevention Research 02/2014; · 4.89 Impact Factor
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    ABSTRACT: The HOXB13 gene has been implicated in prostate cancer (PrCa) susceptibility. We performed a high resolution fine-mapping analysis to comprehensively evaluate the association between common genetic variation across the HOXB genetic locus at 17q21 and PrCa risk. This involved genotyping 700 SNPs using a custom Illumina iSelect array (iCOGS) followed by imputation of 3195 SNPs in 20,440 PrCa cases and 21,469 controls in The PRACTICAL consortium. We identified a cluster of highly correlated common variants situated within or closely upstream of HOXB13 that were significantly associated with PrCa risk, described by rs117576373 (OR 1.30, P = 2.62×10(-14)). Additional genotyping, conditional regression and haplotype analyses indicated that the newly identified common variants tag a rare, partially correlated coding variant in the HOXB13 gene (G84E, rs138213197), which has been identified recently as a moderate penetrance PrCa susceptibility allele. The potential for GWAS associations detected through common SNPs to be driven by rare causal variants with higher relative risks has long been proposed; however, to our knowledge this is the first experimental evidence for this phenomenon of synthetic association contributing to cancer susceptibility.
    PLoS Genetics 02/2014; 10(2):e1004129. · 8.52 Impact Factor
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    ABSTRACT: Mindfulness-based stress reduction (MBSR) reduces symptoms of depression, anxiety, and fear of recurrence among breast cancer (BC) survivors. However, the effects of MBSR (BC) on telomere length (TL) and telomerase activity (TA), known markers of cellular aging, psychological stress, and disease risk, are not known. This randomized, wait-listed, controlled study, nested within a larger trial, investigated the effects of MBSR (BC) on TL and TA. BC patients (142) with Stages 0-III cancer who had completed adjuvant treatment with radiation and/or chemotherapy at least 2 weeks prior to enrollment and within 2 years of completion of treatment with lumpectomy and/or mastectomy were randomly assigned to either a 6-week MBSR for BC program or a usual care. Assessments of TA and TL were obtained along with psychological measurements at baseline, 6 weeks, and 12 weeks after completing the MBSR(BC) program. The mean age of 142 participants was 55.3 years; 72% were non-Hispanic White; 78% had Stage I or II cancer; and 36% received both chemotherapy and radiation. In analyses adjusted for baseline TA and psychological status, TA increased steadily over 12 weeks in the MBSR(BC) group (approximately 17%) compared to essentially no increase in the control group (approximately 3%, p < .01). In contrast, no between-group difference was observed for TL (p = .92). These results provide preliminary evidence that MBSR(BC) increases TA in peripheral blood mononuclear cells from BC patients and have implications for understanding how MBSR(BC) may extend cell longevity at the cellular level.
    Biological Research for Nursing 01/2014; · 1.85 Impact Factor
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    ABSTRACT: Background. Molecular markers for prostate cancer (PCa) risks are currently lacking. Here we address the potential association of a dinucleotide polymorphism (DNP) in exon 2 of the p73 gene with PCa risk/progression and discern any disruption of p73 protein isoforms levels in cells harboring a p73 DNP allele. Methods. We investigated the association between p73 DNP genotype and PCa risk/aggressiveness and survival by fitting logistic regression models in 1,292 incident cases and 682 controls. Results. Although we detected no association between p73 DNP and PCa risk, a significant inverse relationship between p73 DNP and PCa aggressiveness (AT/AT + GC/AT versus GC/GC, OR = 0.55, 95%Cl = 0.31-0.99) was detected. Also, p73 DNP is marginally associated with overall death (dominant model, HR = 0.76, 95%Cl = 0.57-1.00, P = 0.053) as well as PCa specific death (HR = 0.69, 95%Cl = 0.45-1.06, P = 0.09). Western blot analyses for p73 protein isoforms indicate that cells heterozygous for the p73 DNP have lower levels of ∆Np73 relative to TAp73 (P < 0.001). Conclusions. Our findings are consistent with an association between p73 DNP and low risk for PCa aggressiveness by increasing the expressed TAp73/∆Np73 protein isoform ratio.
    Prostate cancer. 01/2014; 2014:129582.
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    Camille Ragin, Jong Y Park
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    ABSTRACT: The disparities in prostate cancer incidence and mortality continue to be a global public health problem. Efforts to address the prostate cancer disparity in black men have been met with a number of challenges, specifically in the accessibility to biospecimens in the context of global prostate cancer collaborations. During the International Educational Workshop at the Science of Global Prostate Cancer Disparities conference held 1-4 November 2012 in Nassau, the Bahamas, an overview of biobanking and biospecimen repositories, and materials transfer in global prostate cancer collaborations were discussed. The challenges faced by low-resource countries were identified, and potential solutions were recommended.
    ecancermedicalscience 01/2014; 8:454.
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    ABSTRACT: Several variations in the nicotinic receptor genes have been identified to be associated with both lung cancer risk and smoking in the genome-wide association (GWA) studies. However, the relationships among these three factors (genetic variants, nicotine dependence, and lung cancer) remain unclear. In an attempt to elucidate these relationships, we applied mediation analysis to quantify the impact of nicotine dependence on the association between the nicotinic receptor genetic variants and lung adenocarcinoma risk. We evaluated 23 single nucleotide polymorphisms (SNPs) in the five nicotinic receptor related genes (CHRNB3, CHRNA6, and CHRNA5/A3/B4) previously reported to be associated with lung cancer risk and smoking behavior and 14 SNPs in the four 'control' genes (TERT, CLPTM1L, CYP1A1, and TP53), which were not reported in the smoking GWA studies. A total of 661 lung adenocarcinoma cases and 1,347 controls with a smoking history, obtained from the Environment and Genetics in Lung Cancer Etiology case-control study, were included in the study. Results show that nicotine dependence is a mediator of the association between lung adenocarcinoma and gene variations in the regions of CHRNA5/A3/B4 and accounts for approximately 15% of this relationship. The top two CHRNA3 SNPs associated with the risk for lung adenocarcinoma were rs1051730 and rs12914385 (p-value = 1.9×10-10 and 1.1×10-10, respectively). Also, these two SNPs had significant indirect effects on lung adenocarcinoma risk through nicotine dependence (p = 0.003 and 0.007). Gene variations rs2736100 and rs2853676 in TERT and rs401681 and rs31489 in CLPTM1L had significant direct associations on lung adenocarcinoma without indirect effects through nicotine dependence. Our findings suggest that nicotine dependence plays an important role between genetic variants in the CHRNA5/A3/B4 region, especially CHRNA3, and lung adenocarcinoma. This may provide valuable information for understanding the pathogenesis of lung adenocarcinoma and for conducting personalized smoking cessation interventions.
    PLoS ONE 01/2014; 9(9):e107268. · 3.53 Impact Factor
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    ABSTRACT: Although the causes of prostate cancer are largely unknown, previous studies support the role of genetic factors in the development of prostate cancer. CHEK2 plays a critical role in DNA replication by responding to double-stranded breaks. In this review, we provide an overview of the current knowledge of the role of a genetic variant, 1100delC, of CHEK2 on prostate cancer risk and discuss the implication for potential translation of this knowledge into clinical practice. Currently, twelve articles that discussed CHEK2 (∗)1100delC and its association with prostate cancer were identified. Of the twelve prostate cancer studies, five studies had independent data to draw conclusive evidence from. The pooled results of OR and 95% CI were 1.98 (1.23-3.18) for unselected cases and 3.39 (1.78-6.47) for familial cases, indicating that CHEK2 (∗)1100delC mutation is associated with increased risk of prostate cancer. Screening for CHEK2(∗)1100delC should be considered in men with a familial history of prostate cancer.
    Prostate cancer. 01/2014; 2014:294575.
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    ABSTRACT: Conventional biomarkers cannot always establish the cause of pleural effusions; thus, alternative tests permitting rapid and accurate diagnosis are required. The primary aim of this study is to assess the ability of pentraxin-3 (PTX3) in order to diagnose the cause of pleural effusion and compare its efficacy to that of other previously identified biomarkers. We studied 118 patients with pleural effusion, classified as transudates and exudates including malignant, tuberculous, and parapneumonic effusions (MPE, TPE, and PPE). The levels of PTX3, C-reactive protein (CRP), procalcitonin (PCT) and lactate in the pleural fluid were assessed. The levels of pleural fluid PTX3 were significantly higher in patients with PPE than in those with MPE or TPE. PTX3 yielded the most favorable discriminating ability to predict PPE from MPE or TPE by providing the following: area under the curve, 0.74 (95% confidence interval, 0.63-0.84), sensitivity, 62.07%; and specificity, 81.08% with a cut-off point of 25.00 ng/mL. Our data suggests that PTX3 may allow improved differentiation of PPE from MPE or TPE compared to the previously identified biomarkers CRP and PCT.
    Tuberculosis and Respiratory Diseases 12/2013; 75(6):244-9.
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    ABSTRACT: An association between low serum vitamin D levels and poorer melanoma survival has been reported. We have studied inheritance of a polymorphism of the GC gene, rs2282679, coding for the vitamin D-binding protein, which is associated with lower serum levels of vitamin D, in a meta-analysis of 3137 melanoma patients. The aim was to investigate evidence for a causal relationship between vitamin D and outcome (Mendelian randomization). The variant was not associated with reduced OS in the UK cohort, per-allele hazard ratio (HR) for death 1.23 (95% CI 0.93,1.64. In the smaller cohorts, HR in OS analysis was 1.07 (95% CI 0.88,1.3) and for all cohorts combined, HR for OS was 1.09 (95% CI 0.93,1.29). There was evidence of increased melanoma specific deaths in the 7 cohorts for which these data were available. The lack of unequivocal findings despite the large sample size illustrates the difficulties of implementing Mendelian randomization. This article is protected by copyright. All rights reserved.
    Pigment Cell & Melanoma Research 11/2013; · 5.84 Impact Factor
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    ABSTRACT: Korean pear has been used as a traditional prophylactic agent for alcohol hangover. However, its mechanism was not investigated in human yet. Therefore, we performed a randomized single blind crossover trial with 14 healthy young men to examine effects of Korean pear juice on alcohol hangover. All subjects consumed 540 ml of spirits (alcohol conc. 20.1 v/v%) after 30 minutes from the intervention, i.e. placebo or Korean pear juice treatment. Blood and urine specimens were collected in time-courses (9 time-points for 15 hrs after alcohol consumption). The total and average of hangover severity were alleviated to 16% and 21% by Korean pear juice at 15 hrs after the alcohol consumption (ps<0.05). Particularly, 'trouble concentrating' was significantly improved by the pear juice treatment (p<0.05). Impaired memory, sensitivity to light and sound, and mean of hangover severity were significantly improved by Korean pear juice among the subjects with ALDH2∗1/∗1 or ALDH2∗1/∗2 genotypes (ps<0.05) but not in the subjects with ALDH2∗2/∗2 genotype. In addition, the pear juice treatment lowered levels of blood alcohol (p<0.01). Therefore, Korean pear juice may alleviate alcohol- hangover and its detoxification of alcohol seems to be modified by the genetic variation of ALDH2.
    Food and chemical toxicology: an international journal published for the British Industrial Biological Research Association 04/2013; · 2.99 Impact Factor
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    ABSTRACT: Associations between single nucleotide polymorphisms (SNPs) at 5p15 and multiple cancer types have been reported. We have previously shown evidence for a strong association between prostate cancer (PrCa) risk and rs2242652 at 5p15, intronic in the telomerase reverse transcriptase (TERT) gene that encodes TERT. To comprehensively evaluate the association between genetic variation across this region and PrCa, we performed a fine-mapping analysis by genotyping 134 SNPs using a custom Illumina iSelect array or Sequenom MassArray iPlex, followed by imputation of 1094 SNPs in 22 301 PrCa cases and 22 320 controls in The PRACTICAL consortium. Multiple stepwise logistic regression analysis identified four signals in the promoter or intronic regions of TERT that independently associated with PrCa risk. Gene expression analysis of normal prostate tissue showed evidence that SNPs within one of these regions also associated with TERT expression, providing a potential mechanism for predisposition to disease.
    Human Molecular Genetics 03/2013; · 7.69 Impact Factor
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    ABSTRACT: Prostate cancer is the most frequently diagnosed cancer in males in developed countries. To identify common prostate cancer susceptibility alleles, we genotyped 211,155 SNPs on a custom Illumina array (iCOGS) in blood DNA from 25,074 prostate cancer cases and 24,272 controls from the international PRACTICAL Consortium. Twenty-three new prostate cancer susceptibility loci were identified at genome-wide significance (P < 5 × 10(-8)). More than 70 prostate cancer susceptibility loci, explaining ∼30% of the familial risk for this disease, have now been identified. On the basis of combined risks conferred by the new and previously known risk loci, the top 1% of the risk distribution has a 4.7-fold higher risk than the average of the population being profiled. These results will facilitate population risk stratification for clinical studies.
    Nature Genetics 03/2013; 45(4):385-391. · 35.21 Impact Factor
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    ABSTRACT: Background: Telomeres help maintain chromosomal structure and may influence tumorigenesis. We examined the association between telomere length and skin cancer in a clinic-based case-control study of 198 melanoma cases, 136 squamous cell carcinoma (SCC) cases, 185 basal cell carcinoma (BCC) cases, and 372 healthy controls. Methods: Cases were histologically confirmed patients treated at the Moffitt Cancer Center and University of South Florida Dermatology Clinic in Tampa, FL. Controls self-reported no history of cancer and underwent a skin cancer screening exam at study enrollment to rule out the presence of skin cancer. Quantitative real time PCR was used to measure telomere length in peripheral blood samples. Results: Melanoma patients had longer telomeres than controls (odds ratio (OR)=3.75; 95% confidence interval (CI): 2.02-6.94 for highest versus lowest tertile) (P for trend=<0.0001). In contrast, longer telomere length was significantly inversely associated with SCC (OR=0.01; 95% CI: 0.00-0.05 for highest versus lowest tertile) (P for trend=<0.0001) and BCC (OR=0.10; 95% CI: 0.06-0.19 for highest versus lowest tertile) (P for trend=<0.0001). Conclusion: Telomere length may be involved in the development of skin cancer, although the effect on cancer risk differs for melanoma and non-melanoma carcinomas. Our findings suggest that long telomere length is positively associated with melanoma while inversely associated with SCC and BCC.
    Cancer epidemiology. 03/2013;

Publication Stats

692 Citations
275.34 Total Impact Points

Institutions

  • 2003–2014
    • Moffitt Cancer Center
      • • Department of Cancer Epidemiology
      • • Department of Biostatistics
      Tampa, Florida, United States
  • 2013
    • Seoul Women's University
      Sŏul, Seoul, South Korea
  • 2011–2012
    • Sookmyung Women's University
      • College of Pharmacy
      Seoul, Seoul, South Korea
    • University of California, San Francisco
      San Francisco, California, United States
    • Institute of Cancer Research
      Londinium, England, United Kingdom
  • 1999
    • Temple University
      • Department of Pathology and Laboratory Medicine
      Philadelphia, PA, United States