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Yerebakan H, Castano A, Ota T, George I, Hwang L, Jones S, Ryus C, Naroji S, Alvarez J, Naka Y, Takayama H, Maurer M. Long-Term Outcomes of Orthotopic Heart Transplantation in Patients with Cardiac Amyloidosis: Differential Survival by Amyloid Type. J Heart Lung Transplant 2013. [DOI: 10.1016/j.healun.2013.01.231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Trieu V, Hwang L, Motamed K, Hsiao C. 201 THERAPEUTIC DRUG MONITORING (TDM) ASSAYS FOR LH AND FSH. Maturitas 2012. [DOI: 10.1016/s0378-5122(12)70312-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Sachdeva M, Wu H, Ru P, Hwang L, Trieu V, Mo YY. MicroRNA-101-mediated Akt activation and estrogen-independent growth. Oncogene 2010; 30:822-31. [PMID: 20956939 DOI: 10.1038/onc.2010.463] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
MicroRNAs are gene regulators that work through a posttranscriptional repression mechanism. Dysregulation of microRNA expression could lead to a variety of disorders, in particular, human cancer, and has also been implicated in antihormone therapy resistance. However, little is known whether microRNAs have a role in estrogen-independent growth, leading to tamoxifen resistance in estrogen receptor (ER)-positive tumors. In this study, we use an in vivo selection system against a microRNA library using the MCF-7 model and demonstrate that miR-101 promotes estrogen-independent growth and causes the upregulation of phosphorylated Akt (pAkt) without impacting the ER level or activity. Importantly, although miR-101 suppresses cell growth in normal estradiol (E2)-containing medium, it promotes cell growth in E2-free medium. Moreover, estrogen deprivation greatly enhances miR-101-mediated Akt activation. Finally, we show that MAGI-2 (membrane-associated guanylate kinase), a scaffold protein required for PTEN (phosphatase and tensin homolog) activity, is a direct target for miR-101; suppression of MAGI-2 by miR-101 reduces PTEN activity, leading to Akt activation. Taken together, these results not only establish a role for miR-101 in estrogen-independent signaling but also provide a mechanistic link between miR-101 and Akt activation.
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Johnson FM, Bekele BN, Feng L, Wistuba II, Tang X, Tran HT, Erasmus JJ, Hwang L, Takebe N, Stewart DJ. Phase II study of dasatinib in patients with advanced non-small cell lung cancer. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.7594] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Blackwell KL, Hamilton EP, Rocha G, Gainey M, Trieu VN, Motamed K, Pramanik P, Hwang L, Treece T, Desai N. SPARC microenvironment signature (SMS) in patients treated with nab-paclitaxel (nabP)/carboplatin (C)/bevacizumab(B) for triple-negative metastatic breast cancer (TNMBC). J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.e21040] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Yardley DA, Daniel BR, Inhorn RC, Vazquez ER, Trieu VN, Motamed K, Hwang L, Rugo HS, Desai N. SPARC microenvironment signature (SMS) analysis of a phase II trial of neoadjuvant gemcitabine (G), epirubicin (E), and nab-paclitaxel ( nab-P) in locally advanced breast cancer (LABC). J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.10574] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Desai N, Piacente M, Liu X, D'Cruz O, Hwang L, Lin X, Ran S, Markovic S, Motamed K, Trieu VN. Effect of plasma SPARC on outcome in cancer models. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.10600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Markovic S, Suman V, Trieu VN, Liu X, Yeh W, Hwang L, Treece T, Motamed K, Pramanik P, Desai N. Tumor SPARC microenvironment signature (SMS) and plasma levels in a phase II trial of unresectable stage IV melanoma treated with nab-paclitaxel and carboplatin: A translational study of NCCTG trial N057E. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.8578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Knauer D, Hwang L, Lowe C, Hwang J, Norng M, Trieu V, Desai N. Albumin-Binding and Angiogenic Domains of SPARC Located at Its C-Terminus. Cancer Res 2009. [DOI: 10.1158/0008-5472.sabcs-09-2144] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background: SPARC (Secreted Protein Acidic and Rich in Cysteine) is an albumin-binding glycoprotein overexpressed in breast cancer and is associated with poor prognosis and shorter overall survival. We have previously shown that SPARC expression appeared to correlate with response to nanoparticle albumin-bound (nab) paclitaxel (Abraxane) in head-and-neck and pancreatic-cancer patients. To further define the role of SPARC, recombinant-human SPARC (rhSPARC) was characterized to identify its albumin-binding and angiogenic domain.Materials and methods: The albumin-binding site on SPARC was defined by testing the binding of Alexa 488-labeled BSA to immobilized rhSPARC in a solid-phase-binding assay and in a competitive-binding assay in presence of increasing concentration of various SPARC-derived peptides. The angiogenic activity of rhSPARC was evaluated using a HUVEC tube-formation assay.Results: The SPARC albumin-binding assay revealed a pattern of saturable and specific binding with an estimated Kd of 700 µM very near the known plasma concentration of albumin (600 µM). Competitive binding with Cathepsin K-digested SPARC and SPARC-derived peptides defined the albumin-binding domain to be amino acids 209-223 in the C-terminal region. In the HUVEC tube-formation assay, rhSPARC was pro-angiogenic at 10 µg/ml and anti-angiogenic at 100 µg/ml. The angiogenic domain of SPARC was located to the C-terminal of SPARC.Discussion: The albumin-binding domain of SPARC was located to residues aa209-223, supporting its role as a target for nab-technology-based drug delivery. We confirmed that SPARC can promote angiogenesis at physiological concentrations, contributing to the role of SPARC in a more aggressive tumor phenotype. The angiogenic domain of SPARC is located within a 54-aa sequence of its C-terminus. SPARC could be a potential therapeutic target and a biomarker for predicting response to nab-paclitaxel.
Citation Information: Cancer Res 2009;69(24 Suppl):Abstract nr 2144.
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Knauer D, Hwang L, Lowe C, Hwang J, Norng M, Wu R, Trieu V, Desai N. 1003 Identification of the albumin-binding domain and the angiogenic domain of SPARC. EJC Suppl 2009. [DOI: 10.1016/s1359-6349(09)70296-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Johnson FM, Tang X, Tran H, Saigal B, Erasmus J, Kurie J, Hwang L, Oh Y, Lippman S, Stewart DJ. Phase II study of dasatinib in non-small cell lung cancer (NSCLC). J Clin Oncol 2009. [DOI: 10.1200/jco.2009.27.15_suppl.e19015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
e19015 Background: Lung cancer is the leading cause of cancer-related deaths. Better systemic therapies are needed. One potential therapeutic target is c-Src which is expressed and activated in NSCLC patient tumors where it can mediate invasion, angiogenesis, and proliferation. Additionally, epidermal growth factor receptor (EGFR) and c-Src cooperate to promote NSCLC survival. We are conducting a phase II study of dasatinib, a tyrosine kinase inhibitor of c-Src, Abl, c-Kit, PDGFR, Btk, and EphA2. The primary objective is to determine the rate of progression free survival at 12 weeks in patients with metastatic NSCLC treated with dasatinib as front line therapy. Methods: Patients with metastatic NSCLC were treated with dasatinib (100 mg BID), with PET/CT scans every 6 weeks. KRAS and EGFR mutations, EGFR copy number, and pSrc expression were measured in pre-treatment biopsies. Blood was collected pretreatment and on day 21 to measure drug exposure (PK), pharmacodynamics (PD), and serum cytokine levels. Results: Twenty five patients have enrolled on study. Of the 16 patients evaluable for response: 1 had a partial response (PR) with no evidence of recurrence for at least 18 months (male smoker with adenocarcinoma and KRAS mutation); 6 patients had stable disease (SD) which includes 3 patients with prolonged stable disease for 4, 6, and 18 months; 9 had progressive disease (PD). Only 4 patients had a significant change in SUV (>25%): decreased in 2 with PR and SD and increased in 2 with PD and SD. There is currently no clear association between EGFR and KRAS mutational analysis and response, although the sample number is small. Only 2 patients have activating EGFR mutations: one with SD and one with PD. PK, PD, and cytokine data will be presented. The most common grade 3/4 toxicity is dyspnea/pleural effusion that has led to a reduced dasatinib starting dose in subsequent patients. Conclusions: Dasatinib as a single agent has activity in a subset of patients with NSCLC. Planned correlative studies may lead to the discovery of biomarkers that predict response. Toxicities observed were consistent with prior dasatinib phase I studies in solid tumor patients. Supported by NCI/CTEP (NIH contract N01-CM-62202), The Commonwealth Foundation for Cancer Research and Bristol-Myers Squibb. [Table: see text]
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Sciard D, Hwang L, Nguyen AT, Lee C, Nguyen TT, Kocieniewska D. 466. Peripheral Nerve Blocks for Ambulatory Surgery in a Private Practice Setting. Reg Anesth Pain Med 2008. [DOI: 10.1136/rapm-00115550-200809001-00308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Hwang L, Williams M, Grimes C, Fang S, Oujesky B. High Hiv Incidence among Drug Users in Hepatitis B Vaccination Project from Inner City Neighborhoods. Am J Epidemiol 2006. [DOI: 10.1093/aje/163.suppl_11.s194-c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Tsai Y, Hwang L. P.172 Functional comparison of the antagonism of hepatitis C virus genotype 1b and 2a nonstructural protein 5a to interferon antiviral activity. J Clin Virol 2006. [DOI: 10.1016/s1386-6532(06)80352-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Hwang L, Tebb K, Shafer M, Wibbelsman C, Pai-Dhungat M, Pantell R. 371 RETESTING FOR CHLAMYDIA TRACHOMATIS IN ADOLESCENTS: HOW WELL ARE WE DOING?:. J Investig Med 2005. [DOI: 10.2310/6650.2005.00005.370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Hwang L, Shafer M, Tebb K, Wibbelsman C, Cruz-Pecson S, Pai-Dhungat M, Pantell B. 358 TREATMENT AND FOLLOW-UP OF ADOLESCENTS WITH CHLAMYDIA TRACHOMATIS INFECTIONS. J Investig Med 2004. [DOI: 10.1136/jim-52-suppl1-358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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D'Souza G, Arafat R, Hwang L, Cunningham C, Shah S, Reynolds K. Cross-sectional survey of the extent and indicators of hepatitis C virus infection in Houston Department of Health and Human Services' sexually transmitted disease clinics. J Viral Hepat 2003; 10:134-40. [PMID: 12614470 DOI: 10.1046/j.1365-2893.2003.00410.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
To evaluate the prevalence and indicators of hepatitis C virus (HCV) infection in Houston and determine the effectiveness of targeted HCV screening in sexually transmitted disease (STD) clinics. We performed a cross-sectional survey in low-risk and high-risk groups in Houston. This included a blinded survey of HCV conducted in 1010 STD clinic clients having serological syphilis tests, and 1885 multi-speciality group practice patients having metabolic blood work. This was followed with a targeted hepatitis C survey of 822 high-risk clients from STD clinics. The seroprevalence of hepatitis C infection in the blinded survey was 3.9% (95% CI 3.0-4.8) in the multi-speciality group and 5.0% (95% CI 3.7-6.3) in the STD clinics. Prevalence of hepatitis C infection among targeted STD clinic clients was significantly higher at 15.3% (95% CI 12.7-17.7). Risk factors that correlated with HCV infection after logistic regression included: injection drug use (OR = 10, 95% CI = 3.4-30.3), heroin use (OR = 6.6, 95% CI = 2.2-20.5), non-transfusion/ transplantation blood exposure (OR = 3.0, 95% CI = 1.3-6.9), sharing equipment to snort drugs (OR = 2.5, 95% CI 1.2-5.4), and age above 25 years (OR = 51, 95% CI = 9-47). This study demonstrates that targeting clients in STD clinics for known risk behaviours is an effective way to identify cases of HCV infection. STD clinics allow access to clients with both drug use and sexual risk behaviours and are a useful location for targeting hepatitis C screening and prevention efforts.
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Hwang L, Orengo I. Lipoatrophy associated with glatiramer acetate injections for the treatment of multiple sclerosis. Cutis 2001; 68:287-8. [PMID: 11710450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
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Champoux M, Hwang L, Lang O, Levine S. Feeding demand conditions and plasma cortisol in socially-housed squirrel monkey mother-infant dyads. Psychoneuroendocrinology 2001; 26:461-77. [PMID: 11337131 DOI: 10.1016/s0306-4530(01)00006-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Previous studies have demonstrated that experimentally altering the accessibility and availability of food can have profound impact on behavior and adrenocortical activity in nonhuman primate species. In this study, groups of mother-infant squirrel monkey dyads were housed in either high demand (HFD: 120% normal daily food intake provided), low demand (LFD: 600% normal daily food intake provided) or variable demand (VFD: alternating two-week blocks of low demand and high demand) conditions for 12 weeks. During the 12-week experimental foraging phase, animals in the HFD group exhibited prolonged and consistent cortisol elevations. The cortisol levels in the VFD group reflected the ambient demand condition, with higher levels exhibited during the high demand phases of the study, and lower values when the low demand condition was in effect. Overall, mothers were more affected by the experimental manipulation than were infants. The experimental condition did not affect the infants' response to a 24-h separation from their mothers. A suppression of cortisol levels, particularly in the HFD group, was observed upon resumption of ad-libitum feeding.
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Krishnan R, Hwang L, Orengo I. Dog-ear graft technique. Dermatol Surg 2001; 27:312-4. [PMID: 11277904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
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Nunez-Gussman J, Hwang L, Hsu S. Guess what! Targetoid erythematous plaques: an unusual morphological presentation of multibacillary Hansen's disease. Eur J Dermatol 2001; 11:65-7. [PMID: 11174144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
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Hwang L, Wilson H, Orengo I. Off-center fold: irregular, pigmented genital macules. ARCHIVES OF DERMATOLOGY 2000; 136:1559-64. [PMID: 11115176 DOI: 10.1001/archderm.136.12.1559-b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Chesler L, Hwang L, Patton W, Heyman MB. Henoch-Schönlein purpura with severe jejunitis and minimal skin lesions. J Pediatr Gastroenterol Nutr 2000; 30:92-5. [PMID: 10630446 DOI: 10.1097/00005176-200001000-00024] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
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