Elizabeth A Grimm

University of Texas MD Anderson Cancer Center, Houston, Texas, United States

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Publications (227)1119.92 Total impact

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    ABSTRACT: c-Jun N-terminal kinase (JNK) known as the stress activated protein kinase, is a key mediator of a variety of stress stimuli, including proinflammatory cytokines, reactive oxygen species, and ultraviolet radiation (Bogoyevitch et al., 2010). By phosphorylating crucial molecules such as c-Jun, p53, and Bcl-2, active JNK regulates cell growth, differentiation, apoptosis, and autophagy (Bogoyevitch et al., 2010). Previous studies of JNK in cancer cells have produced paradoxical findings, with some supporting a pro-oncogenic function and others demonstrating its role as a tumor suppressor (Bogoyevitch et al., 2010; Tournier, 2013). To date, the role of JNK in melanoma remains ambiguous.This article is protected by copyright. All rights reserved.
    Pigment Cell & Melanoma Research 12/2014; 28(2). DOI:10.1111/pcmr.12348 · 5.84 Impact Factor
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    ABSTRACT: Primary uveal melanoma tumors have been shown to harbor activating mutations in the heterotrimeric G-alpha protein subunits GNAQ or GNA11 genes in approximately 85% of samples.(Van Raamsdonk et al., 2009, Van Raamsdonk et al., 2010) Mutations in GNAQ or GNA11 are mutually exclusive, and result in amino acid changes at either the R183 or Q209 sites. GNAQ or GNA11 mutations have also been identified in uveal melanoma liver metastases suggesting that the metastatic cells in the liver are derived from primary tumor cell clones with these mutations.(Carvajal et al. 2014) In addition, the many uveal melanoma cell lines derived from metastatic sites also harbor GNAQ or GNA11 mutations.(Griewank et al., 2012)This article is protected by copyright. All rights reserved.
    Pigment Cell & Melanoma Research 12/2014; DOI:10.1111/pcmr.12345 · 5.84 Impact Factor
  • Zhen Ding, Yong Qin, John E Wiktorowicz, Elizabeth A Grimm
    Nitric Oxide 11/2014; 42C:120. DOI:10.1016/j.niox.2014.09.065 · 3.18 Impact Factor
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    ABSTRACT: An obstacle to effective gene-based cancer therapies is the limited number of cancer-specific growth suppressing and apoptosis-inducing genes. Using a differentiation induction subtraction hybridization (DISH) approach with human melanoma cells, melanoma differentiation associated (mda) genes were isolated that display elevated expression as a function of irreversible growth arrest, cancer reversion and terminal differentiation. This screening paradigm resulted in the cloning of mda-7 in the context of terminal differentiation of human melanoma cells. Based on its structure, chromosomal location, sequence homology and cytokine-like properties, mda-7 has now been renamed IL-24 and classified as a member of the expanding IL-10 cytokine gene family. Expression of mda-7/IL-24 inversely correlates with melanoma progression and administration of mda-7/IL-24 by means of a replication incompetent adenovirus, Ad.mda-7, results in growth suppression and apoptosis in melanoma cells as well as in a broad-spectrum of additional cancer cell types. In contrast, Ad.mda-7 does not elicit deleterious effects in normal cells, including those of epithelial, fibroblast, astrocyte, melanocyte or endothelial origin. Based on these distinctive properties and anti-tumor and anti-angiogenic activities in human tumor xenograft animal models, mda-7/IL-24 has now entered the clinical arena. A Phase I/II clinical trial in patients with advanced carcinomas involving intratumoral administration of mda-7/IL-24 [using a replication incompetent adenovirus; ING241 (Ad.mda-7)] has documented that this gene is safe and well tolerated by patients and a single virus injection elicits apoptosis in a majority of the tumor. Current data suggests that mda-7/IL-24 may function as a dual-acting cytokine in which its normal physiological functions may be related to specific aspects of the immune system and over-expression culminates in cancer-specific apoptosis. This review will provide a prospectus of our current understanding of mda-7/IL-24.
    Cancer biology & therapy 10/2014; 2(4 Suppl 1):S23-37. DOI:10.4161/cbt.458 · 3.63 Impact Factor
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    ABSTRACT: The role of inflammation in cancer has been reported in various adult malignant neoplasms. By contrast, its role in pediatric tumors has not been as well studied. In this study, we have identified and characterized the infiltration of various inflammatory immune cells as well as inflammatory markers in Wilms tumor (WT), the most common renal malignancy in children. Formalin-fixed paraffin-embedded blocks from tumors and autologous normal kidneys were immunostained for inflammatory immune cells (T cells, B cells, macrophages, neutrophils, and mast cells) and inflammatory markers such as cyclooxygenase-2 (COX-2), hypoxia-inducible factor 1α, phosphorylated STAT3, phosphorylated extracellular signal–related kinases 1 and 2, inducible nitric oxide synthase, nitrotyrosine, and vascular endothelial growth factor expression. Overall, we found that there was predominant infiltration of tumor-associated macrophages in the tumor stroma where COX-2 was robustly expressed. The other tumor-associated inflammatory markers were also mostly localized to tumor stroma. Hence, we speculate that COX-2–mediated inflammatory microenvironment may be important in WT growth and potential therapies targeting this pathway may be beneficial and should be tested in clinical settings for the treatment of WTs in children.
    Translational oncology 08/2014; DOI:10.1016/j.tranon.2014.05.008 · 3.40 Impact Factor
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    ABSTRACT: Mutagen sensitivity assay, which measures the enhanced cellular response to DNA damage induced in vitro by mutagens/carcinogens, has been used in the study of cancer susceptibility. 4-Nitroquinoline-1-oxide (4-NQO), an ultraviolet (UV) radiation-mimetic chemical, can produce chromosomal breaks in mammalian cells and induce cancer. Given the potential role of 4-NQO as the experimental mutagen substituting for UV as the etiological carcinogen of cutaneous melanoma (CM), we tested the hypothesis that cellular sensitivity to 4-NQO is associated with the risk of developing CM in a case-control study of 133 patients with primary CM and 176 cancer-free controls. Short-term blood cultures were treated with 4-NQO at a final concentration of 10 μmol/l for 24 h and scored chromatid breaks in 50 well-spread metaphases. Multivariate logistic regression was used to calculate odds ratios and 95% confidence intervals. We found that the log-transformed frequency of chromatid breaks was significantly higher in 133 patients than in 176 controls (P=0.004) and was associated with an increased risk for CM (adjusted odds ratio=1.78, 95% confidence interval: 1.12-2.84) after adjustment for age and sex. Moreover, as the chromatid break values increased, the risk for CM increased in a dose-dependent manner (Ptrend=0.003). Further analysis explored a multiplicative interaction between the sensitivity to 4-NQO and a family history of skin cancer (Pinteraction=0.004) on the risk of CM. Therefore, our findings suggest that sensitivity to 4-NQO may be a risk factor for the risk of CM, which is more sensitive than UV-induced chromotid breaks.
    Melanoma Research 06/2014; DOI:10.1097/CMR.0000000000000106 · 2.10 Impact Factor
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    ABSTRACT: Nearly all primary uveal melanoma (UM) that metastasize involve the liver. Hepatocyte growth factor (HGF) is proposed to be an important microenvironmental element in attracting/supporting UM metastasis through activation of MET. The majority (>85%) of UM express mutations in the G-alpha proteins, that drive the MEK-ERK1/2 pathway. Thus, we proposed that the combination of MET and MEK inhibition would inhibit the growth and migration of G-alpha protein mutant versus non-mutant UM cells. Western-blots demonstrated the relative protein levels of ERK1/2 and MET in UM cells. Cells were treated with the small molecule inhibitors AZD6244 (MEKi) and/or MK-8033 (METi) and downstream markers evaluated. Further studies determined the effect of combination MEKi and METi treatment on cell growth, apoptosis and migration. All G-alpha protein mutant UM cell lines express MET mRNA and protein. The level of mRNA expression correlates with protein expression. MEKi, but not METi treatment results in markedly reduced ERK1/2 phosphorylation. Either MEKi or METi treatment alone results in reduced cell proliferation, but only modest induction of apoptosis. The combination MEKi+METi results in significant reduction of proliferation in G-alpha protein mutant cells. UM cell migration was blocked by METi, but not MEKi treatment. MET protein expression showed no correlation with G-alpha protein mutation status. Combining MEKi with METi treatment has added benefit to either treatment alone in reducing G-alpha protein mutant UM cell growth. Combining METi with MEKi treatment adds the effect of limiting uveal melanoma cell migration.
    PLoS ONE 02/2014; 9(2):e83957. DOI:10.1371/journal.pone.0083957 · 3.53 Impact Factor
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    ABSTRACT: Melanoma is one of the cancers of fastest-rising incidence in the world. iNOS is overexpressed in melanoma and other cancers, and previous data suggest that iNOS and nitric oxide (NO) drive survival and proliferation of human melanoma cells. However, specific mechanisms through which this occurs are poorly defined. One candidate is the PI3K/AKT/mTOR pathway, which plays a major role in proliferation, angiogenesis, and metastasis of melanoma and other cancers. We used the chick embryo chorioallantoic membrane (CAM) assay to test the hypothesis that melanoma growth is regulated by iNOS-dependent mTOR pathway activation. Both pharmacologic inhibition and siRNA-mediated gene silencing of iNOS suppressed melanoma proliferation and in vivo growth on the CAM in human melanoma models. This was associated with strong downregulation of mTOR pathway activation by Western blot analysis of p-mTOR, p-P70S6K, p-S6RP, and p-4EBP1. iNOS expression and NO were associated with reversible nitrosylation of TSC2, and inhibited dimerization of TSC2 with its inhibitory partner TSC1, enhancing GTPase activity of its target Rheb, a critical activator of mTOR signaling. Immunohistochemical analysis of tumor specimens from stage III melanoma patients showed a significant correlation between iNOS expression levels and expression of mTOR pathway members. Exogenously-supplied NO was also sufficient to reverse mTOR pathway inhibition by the B-Raf inhibitor Vemurafenib. In summary, covalent modification of TSC2 by iNOS-derived NO is associated with impaired TSC2/TSC1 dimerization, mTOR pathway activation, and proliferation of human melanoma. This model is consistent with the known association of iNOS overexpression and poor prognosis in melanoma and other cancers.
    Cancer Research 01/2014; 74(4). DOI:10.1158/0008-5472.CAN-13-0588 · 9.28 Impact Factor
  • Free Radical Biology and Medicine 11/2013; 65:S24. DOI:10.1016/j.freeradbiomed.2013.10.440 · 5.71 Impact Factor
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    ABSTRACT: Oral melanoma (OM) in dogs is an aggressive malignancy, with clinical behavior resembling cutaneous melanomas in humans. Melanoma in humans is promoted by an inflammatory environment that is contributed to by leptin and inducible nitric oxide synthase (iNOS). To determine if the patterns of leptin and iNOS expression are similar in OM in dogs and cutaneous melanomas in humans. Twenty client-owned dogs. Retrospective case study. Immunostaining of the OM tumors from each dog was scored for percentage and intensity of leptin and iNOS expression. Mitotic index was used as an indicator of tumor aggression. Leptin was detected in ≥75% of the tumor cells in specimens from 11 dogs. One tumor expressed leptin in ≤25% of the cells. The intensity of leptin expression was variable with 6, 9, and 5 cases exhibiting low-, moderate-, and high-intensity staining, respectively. OM with the lowest percentage of iNOS positive cells displayed the highest mitotic indices (P = .006, ANOVA). The expression of leptin is a common finding in melanomas in dogs. These data suggest that the possibility of future clinical applications, such as measuring the concentrations of plasma leptin as a screening tool or leptin as a target for therapy. The relevance of iNOS is not as clear in dogs with OM, for which other directed therapeutics might be more appropriate.
    Journal of Veterinary Internal Medicine 09/2013; 27(5):1278-82. DOI:10.1111/jvim.12169 · 2.06 Impact Factor
  • Cancer Research 08/2013; 73(8 Supplement):2936-2936. DOI:10.1158/1538-7445.AM2013-2936 · 9.28 Impact Factor
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    ABSTRACT: It is widely accepted that many cancers express features of inflammation, driven by both microenvironmental cells and factors, and the intrinsic production of inflammation-associated mediators from malignant cells themselves. Inflammation results in intracellular oxidative stress, with the ultimate biochemical oxidants composed of reactive nitrogens and oxygens. Although the role of inflammation in carcinogensis is well accepted, we now present data that inflammatory processes are also active in the maintenance phase of many aggressive forms of cancer. The oxidative stress of inflammation is proposed to drive a continuous process of DNA adducts and crosslinks, as well as posttranslational modifications to lipids and proteins that we argue support growth and survival. In this Perspective we introduce data on the emerging science of inflammation-driven posttranslational modifications on proteins responsible for driving growth, angiogenesis, immunosuppression, and inhibition of apoptosis. Examples include data from human melanoma, breast, head and neck, lung, and colon cancers. Fortunately, numerous anti-oxidant agents are clinically available, and we further propose that the pharmacological attenuation of these inflammatory processes, particularly the reactive nitrogen species, will restore the cancer cells to an apoptosis-permissive and growth inhibitory state. Our mouse model data using an arginine antagonist that prevents enzymatic production of nitric oxide, directly supports this view. We contend that selected antioxidants be considered as part of the cancer treatment approach, as they are likely to provide a novel and mechanistically justified addition for therapeutic benefit.
    Clinical Cancer Research 07/2013; 19(20). DOI:10.1158/1078-0432.CCR-12-1554 · 8.19 Impact Factor
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    ABSTRACT: Melanoma is the most highly malignant skin cancer, and nucleotide excision repair (NER) is involved in melanoma susceptibility. In this analysis of 1,042 melanoma patients, we evaluated whether genetic variants of NER genes may predict survival outcome of melanoma patients. We used genotyping data of 74 tagging single-nucleotide polymorphisms (tagSNPs) in eight core NER genes from our genome-wide association study (including two in XPA, 14 in XPC, three in XPE, four in ERCC1, 10 in ERCC2, eight in ERCC3, 14 in ERCC4, and 19 in ERCC5) and evaluated their associations with prognosis of melanoma patients. Using the Cox proportional hazards model and Kaplan-Meier analysis, we found a predictive role of XPE rs28720291, ERCC5 rs4150314, XPC rs2470458, and ERCC2 rs50871 SNPs in the prognosis of melanoma patients (rs28720291: AG vs. GG, adjusted hazard ratio (adjHR)=11.2, 95% confidence interval (CI) 3.04-40.9, P=0.0003; rs4150314: AG vs. GG, adjHR=4.76, 95% CI 1.09-20.8, P=0.038; rs2470458: AA vs. AG/GG, adjHR=2.11, 95% CI 1.03-4.33, P=0.040; and rs50871: AA vs. AC/CC adjHR=2.27, 95% CI 1.18-4.35, P=0.015). Patients with an increasing number of unfavorable genotypes had markedly increased death risk. Genetic variants of NER genes, particularly XPE rs28720291, ERCC5 rs4150314, XPC rs2470458, and ERCC2 rs50871, may independently or jointly modulate survival outcome of melanoma patients. Because our results were based on a median follow-up of 3 years without multiple test corrections, additional large prospective studies are needed to confirm our findings.Journal of Investigative Dermatology advance online publication, 14 February 2013; doi:10.1038/jid.2012.498.
    Journal of Investigative Dermatology 02/2013; DOI:10.1038/jid.2012.498 · 6.19 Impact Factor
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    ABSTRACT: In an earlier genome-wide association (GWA) study and the subsequent replications, three loci located in the melanocortin 1 receptor (MC1R) and TYR genes as well as the regions adjacent to MTAP and CDKN2A were identified to be risk factors for cutaneous melanoma (CM) (Bishop et al., 2009). However, this GWAS study did not cover all the potential genetic risk regions of susceptibility genes. More recently, three additional GWASs identified additional risk loci for CM, including a few SNPs in MC1R (Amos et al., 2011; Barrett et al., 2011; Macgregor et al., 2011). There are a number of SNPs in MC1R that contains only one exon, only a few of which have been included in the published GWASs; therefore, it is necessary to sequence the whole gene to provide a holistic view of the contribution of all MC1R SNPs to risk of CM (Meng et al., 2012). © 2013 John Wiley & Sons A/S.
    Pigment Cell & Melanoma Research 01/2013; 26(3). DOI:10.1111/pcmr.12070 · 5.84 Impact Factor
  • 01/2013; 1(Suppl 1):P89. DOI:10.1186/2051-1426-1-S1-P89
  • Free Radical Biology and Medicine 11/2012; 53:S49. DOI:10.1016/j.freeradbiomed.2012.10.131 · 5.71 Impact Factor
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    ABSTRACT: CDDO-Me has been shown to exert potent anti-inflammatory activity for chronic kidney disease and antitumor activity for several tumors, including melanoma, in early clinical trials. To improve CDDO-Me response in melanoma, we utilized a large-scale synthetic lethal RNAi screen targeting 6,000 human druggable genes to identify targets that would sensitize melanoma cells to CDDO-Me. Based on screening results, five unique genes (GNPAT, SUMO1, SPINT2, FLI1, and SSX1) significantly potentiated the growth-inhibitory effects of CDDO-Me and induced apoptosis in A375, a BRAF mutated melanoma line (P<0.001). These five genes were then individually validated as targets to potentiate CDDO-Me activity, and related downstream signaling pathways of these genes were analyzed. In addition, the levels of phosphorylated Erk1/2, Akt, GSK-2, and PRAS40 were dramatically decreased by downregulating each of these five genes separately, suggesting a set of common mediators. Our findings indicate that GNPAT, SUMO1, SPINT2, FLI1, and SSX1 play critical roles in synergy with inflammation pathways in modulating melanoma cell survival, and could serve as sensitizing targets to enhance CDDO-Me efficacy in melanoma growth control. © 2012 John Wiley & Sons A/S.
    Pigment Cell & Melanoma Research 10/2012; 26(1). DOI:10.1111/pcmr.12031 · 5.84 Impact Factor
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    Keiji Tanese, Elizabeth A Grimm, Suhendan Ekmekcioglu
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    ABSTRACT: Melanoma appears to be heterogeneous in terms of its molecular biology, etiology and epidemiology. We previously reported that the expression of inducible nitric-oxide synthase (iNOS) in melanoma tumor cells is strongly correlated with poor patient survival. Therefore, we hypothesized that nitric oxide (NO) produced by iNOS promotes the melanoma inflammatory tumor microenvironment associated with poor outcome. To understand the role of NO and iNOS in the melanoma inflammatory tumor microenvironment, polymerase chain reaction arrays of inflammatory and autoimmunity genes were performed on a series of stage III melanoma lymph node metastasis samples to compare the gene expression profiles of iNOS-expressing and nonexpressing tumor samples. The results indicate that expression of CXC chemokine ligand 10 (CXCL10) was inversely correlated with iNOS expression, and the high CXCL10-expressing cases had more favorable prognoses than the low CXCL10-expressing cases. Functional studies revealed that treating iNOS-negative/CXCL10-positive melanoma cell lines with a NO donor suppressed the expression of CXCL10. Furthermore, scavenging NO from iNOS-expressing cell lines significantly affected the chemokine expression profile. Culture supernatants from NO scavenger-treated melanoma cells promoted the migration of plasmacytoid dendritic cells, which was diminished when the cells were treated with a CXCL10-neutralizing antibody. CXCL10 has been reported to be an antitumorigenic chemokine. Our study suggests that the production of NO by iNOS inhibits the expression of CXCL10 in melanoma cells and leads to a protumorigenic tumor microenvironment. Inhibiting NO induces an antitumorigenic environment, and thus, iNOS should be considered to be an important therapeutic target in melanoma.
    International Journal of Cancer 08/2012; 131(4):891-901. DOI:10.1002/ijc.26451 · 6.20 Impact Factor
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    ABSTRACT: In this study, we assessed the specific role of BRAF(V600E) signaling in modulating the expression of immune regulatory genes in melanoma, in addition to analyzing downstream induction of immune suppression by primary human melanoma tumor-associated fibroblasts (TAF). Primary human melanocytes and melanoma cell lines were transduced to express WT or V600E forms of BRAF, followed by gene expression analysis. The BRAF(V600E) inhibitor vemurafenib was used to confirm targets in BRAF(V600E)-positive melanoma cell lines and in tumors from melanoma patients undergoing inhibitor treatment. TAF lines generated from melanoma patient biopsies were tested for their ability to inhibit the function of tumor antigen-specific T cells, before and following treatment with BRAF(V600E)-upregulated immune modulators. Transcriptional analysis of treated TAFs was conducted to identify potential mediators of T-cell suppression. Expression of BRAF(V600E) induced transcription of interleukin 1 alpha (IL-1α) and IL-1β in melanocytes and melanoma cell lines. Further, vemurafenib reduced the expression of IL-1 protein in melanoma cell lines and most notably in human tumor biopsies from 11 of 12 melanoma patients undergoing inhibitor treatment. Treatment of melanoma-patient-derived TAFs with IL-1α/β significantly enhanced their ability to suppress the proliferation and function of melanoma-specific cytotoxic T cells, and this inhibition was partially attributable to upregulation by IL-1 of COX-2 and the PD-1 ligands PD-L1 and PD-L2 in TAFs. This study reveals a novel mechanism of immune suppression sensitive to BRAF(V600E) inhibition, and indicates that clinical blockade of IL-1 may benefit patients with BRAF wild-type tumors and potentially synergize with immunotherapeutic interventions. Clin Cancer Res; 18(19); 5329-40. ©2012 AACR.
    Clinical Cancer Research 07/2012; 18(19):5329-40. DOI:10.1158/1078-0432.CCR-12-1632 · 8.19 Impact Factor
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    ABSTRACT: Despite extensive investigation, the precise contribution of the ultraviolet radiation (UVR) component of sunlight to melanoma etiology remains unclear. UVR induces keratinocytes to secrete proinflammatory and immunomodulatory mediators that promote inflammation and skin tumor development; expression of the slug transcription factor in keratinocytes is required for maximal production of these mediators. In the present studies we examined the possibility that UVR-exposed melanocytes also produce proinflammatory mediators and that Slug is important in this process. Microarray studies revealed that both UVR exposure and Slug overexpression altered transcription of a variety of proinflammatory mediators by normal human melanocytes; some of these mediators are also known to stimulate melanocyte growth and migration. There was little overlap in the spectra of cytokines produced by the two stimuli. However IL-20 was similarly induced by both stimuli and the NFκB pathway appeared to be important in both circumstances. Further exploration of UVR-induced and Slug-dependent pathways of cytokine induction in melanocytes may reveal novel targets for melanoma therapy.
    06/2012; 2012:410925. DOI:10.1155/2012/410925
    This article is viewable in ResearchGate's enriched format

Publication Stats

9k Citations
1,119.92 Total Impact Points

Institutions

  • 1988–2014
    • University of Texas MD Anderson Cancer Center
      • • Department of Melanoma Medical Oncology
      • • Department of Experimental Therapeutics
      • • Department of NeuroSurgery
      • • Department of Bioimmunotherapy
      • • Department of Molecular and Cellular Oncology
      • • Department of Cancer Biology
      • • Department of Thoracic Cardiovascular Surgery
      Houston, Texas, United States
  • 2006–2011
    • University of Houston
      Houston, Texas, United States
  • 1996
    • Houston Zoo
      Houston, Texas, United States
  • 1988–1996
    • Baylor College of Medicine
      • Department of Neurosurgery
      Houston, Texas, United States
  • 1992
    • University of Texas Health Science Center at Houston
      • Division of General Surgery (LBJ)
      Houston, TX, United States
  • 1987
    • National Eye Institute
      Maryland, United States
  • 1982–1986
    • National Institutes of Health
      • Branch of Surgery
      베서스다, Maryland, United States
  • 1984
    • National Cancer Institute (USA)
      • Surgery Branch
      Maryland, United States