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Victor MT, Zheng W, Park SJ, Jiang SIB, Guo TW. Insurance Status is Associated With Recurrence in Cutaneous Head and Neck Squamous Cell Carcinoma. Otolaryngol Head Neck Surg 2024; 170:132-140. [PMID: 37622529 DOI: 10.1002/ohn.504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 07/20/2023] [Accepted: 08/01/2023] [Indexed: 08/26/2023]
Abstract
OBJECTIVE To identify socioeconomic factors influencing the presentation and outcomes of cutaneous head and neck squamous cell carcinoma (cHNSCC). STUDY DESIGN Retrospective cohort study. SETTING Tertiary academic medical center with comprehensive cancer center. METHODS Patients treated for cHNSCC at a single institution between 2008 and 2022 were included. Demographic, socioeconomic data and disease characteristics were obtained from medical record abstraction. Outcome measures included tumor stage, number of distinct primaries, recurrence, and disease-related death. χ2 and Mann-Whitney tests were implemented to evaluate clinicopathologic distributions across disease stages. Survival analyses were performed using Cox regression and Kaplan-Meier analysis. RESULTS A total of 346 patients met the inclusion criteria. The median age at presentation and length of follow-up was 70.8 and 3.1 years, respectively. The majority of the cohort was white, male, and English-speaking. 13.3% of patients were underinsured and 27.5% were immunosuppressed. Patients who presented with advanced disease were more likely to be underinsured (21.7% vs 9.6%, P = .006) and have a history of homelessness (8.5% vs 2.1%, P = .014). Immunosuppressed patients were more likely to be underinsured (P = .009). Insurance status (1.97 [1.06-3.66], P = .032) and immune status (2.35 [1.30-4.26], P = .005) were independently associated with worse recurrence-free survival. CONCLUSION Socioeconomic factors that influence access to care, such as insurance status, are associated with cHNSCC disease stage and disease recurrence. These factors may impose barriers that delay diagnosis and treatment. This may result in worse disease-related outcomes and greater treatment-associated morbidity for certain patients.
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Affiliation(s)
- Mitchell T Victor
- Department of Otolaryngology-Head and Neck Surgery, University of California, San Diego Health, La Jolla, California, USA
- Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - Wynne Zheng
- Department of Otolaryngology-Head and Neck Surgery, University of California, San Diego Health, La Jolla, California, USA
| | - Soo J Park
- Moores Cancer Center, University of California, San Diego Health, La Jolla, California, USA
- Division of Hematology and Oncology, Department of Medicine, University of California, San Diego Health, La Jolla, California, USA
| | - Shang I Brian Jiang
- Department of Dermatology, University of California, San Diego Health, La Jolla, California, USA
| | - Theresa W Guo
- Department of Otolaryngology-Head and Neck Surgery, University of California, San Diego Health, La Jolla, California, USA
- Moores Cancer Center, University of California, San Diego Health, La Jolla, California, USA
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2
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Faraji F, Cohen EEW, Guo TW. Evolving treatment paradigms in recurrent and metastatic head and neck squamous cell carcinoma: the emergence of immunotherapy. Transl Cancer Res 2023; 12:1353-1358. [PMID: 37304550 PMCID: PMC10248584 DOI: 10.21037/tcr-23-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2023] [Accepted: 04/24/2023] [Indexed: 06/13/2023]
Affiliation(s)
- Farhoud Faraji
- Department of Otolaryngology-Head and Neck Surgery, Gleiberman Head and Neck Cancer Center, Moores Cancer Center, UC San Diego Health, La Jolla, CA, USA
| | - Ezra E. W. Cohen
- Division of Hematology-Oncology, Department of Internal Medicine, Gleiberman Head and Neck Cancer Center, Moores Cancer Center, UC San Diego Health, La Jolla, CA, USA
| | - Theresa W. Guo
- Department of Otolaryngology-Head and Neck Surgery, Gleiberman Head and Neck Cancer Center, Moores Cancer Center, UC San Diego Health, La Jolla, CA, USA
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3
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Jang SS, Davis ME, Vera DR, Lai SY, Guo TW. Role of sentinel lymph node biopsy for oral squamous cell carcinoma: Current evidence and future challenges. Head Neck 2023; 45:251-265. [PMID: 36193862 PMCID: PMC11081060 DOI: 10.1002/hed.27207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Revised: 08/24/2022] [Accepted: 09/19/2022] [Indexed: 12/14/2022] Open
Abstract
Sentinel lymph node biopsy (SLNB) has been used across oncological specialties for prognostication, staging, and identification of occult nodal metastasis. Recent studies demonstrated the potential clinical utility of SLNB in oral cavity squamous cell carcinoma (OCSCC). Elective neck dissection is the current standard of care in early management of OCSCC with depth of invasion greater than 2-4 mm; however, majority of patients ultimately do not have nodal disease on final pathology. SLNB is an alternative procedure widely adopted in early cancer management in many oncological subspecialities. Several considerations such as depth of invasion, nodal mapping, histopathology methods, operator variability, postoperative complications, and advancement in preoperative and intraoperative imaging technology can guide the appropriate application to SLNB in OCSCC. The aim of this review is to discuss the current evidence for SLNB in the treatment of early stage OCSCC, imaging technologies that support SLNB procedures, and studies that are currently underway.
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Affiliation(s)
- Sophie S Jang
- Department of Otolaryngology - Head and Neck Surgery, University of California, San Diego, La Jolla, California, USA
| | - Morgan E Davis
- Department of Otolaryngology - Head and Neck Surgery, University of California, San Diego, La Jolla, California, USA
| | - David R Vera
- Department of Radiology, University of California, San Diego, La Jolla, California, USA
| | - Stephen Y Lai
- Department of Head and Neck Surgery, The University of Texas M. D. Anderson Cancer Center, Houston, Texas, USA
| | - Theresa W Guo
- Department of Otolaryngology - Head and Neck Surgery, University of California, San Diego, La Jolla, California, USA
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4
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Guo TW, Saiyed F, Yao CMKL, Kiong KL, Martinez J, Sacks R, Lee JJ, Moreno AC, Frank SJ, Rosenthal DI, Glisson BS, Ferrarotto R, Mott FE, Johnson FM, Myers JN. Outcomes of patients with oropharyngeal squamous cell carcinoma treated with induction chemotherapy followed by concurrent chemoradiation compared with those treated with concurrent chemoradiation. Cancer 2021; 127:2916-2925. [PMID: 33873251 DOI: 10.1002/cncr.33491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 12/23/2020] [Accepted: 01/18/2021] [Indexed: 11/11/2022]
Abstract
BACKGROUND Induction chemotherapy (IC) has been associated with a decreased risk of distant metastasis in locally advanced head and neck squamous cell carcinoma. However, its role in the treatment of oropharyngeal squamous cell carcinoma (OPSCC) is not well established. METHODS The outcomes of patients with OPSCC treated with IC followed by concurrent chemoradiation (CRT) were compared with the outcomes of those treated with CRT alone. The primary outcome was overall survival (OS), and the secondary end points were the times to locoregional and distant recurrence. RESULTS In an existing database, 585 patients met the inclusion criteria: 137 received IC plus CRT, and 448 received CRT. Most patients were positive for human papillomavirus (HPV; 90.9%). Patients receiving IC were more likely to present with a higher T stage, a higher N stage, and low neck disease. The 3-year OS rate was significantly lower in patients receiving IC (75.7%) versus CRT alone (92.9%). In a multicovariate analysis, receipt of IC (adjusted hazard ratio [aHR], 3.4; P < .001), HPV tumor status (aHR, 0.36; P = .002), and receipt of concurrent cetuximab (aHR, 2.7; P = .002) were independently associated with OS. The risk of distant metastasis was also significantly higher in IC patients (aHR, 2.8; P = .001), whereas an HPV-positive tumor status (aHR, 0.44; P = .032) and completion of therapy (aHR, 0.51; P = .034) were associated with a lower risk of distant metastasis. In HPV-positive patients, IC remained associated with distant metastatic progression (aHR, 2.6; P = .004) but not OS. CONCLUSIONS In contrast to prior studies, IC was independently associated with worse OS and a higher risk of distant metastasis in patients with OPSCC. Future studies are needed to validate these findings.
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Affiliation(s)
- Theresa W Guo
- Department of Head and Neck Surgery, The University of Texas MD Anderson Cancer Center, Houston, Texas.,Division of Otolaryngology-Head and Neck Surgery, Department of Surgery, University of California, San Diego, California
| | - Faiez Saiyed
- Department of Head and Neck Surgery, The University of Texas MD Anderson Cancer Center, Houston, Texas.,Department of Otorhinolaryngology, University of Maryland School of Medicine, Baltimore, Maryland
| | - Christopher M K L Yao
- Department of Head and Neck Surgery, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Kimberley L Kiong
- Department of Head and Neck Surgery, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Julian Martinez
- Department of Head and Neck Surgery, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Ruth Sacks
- Department of Thoracic Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - J Jack Lee
- Department of Biostatistics, Division of Basic Sciences, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Amy C Moreno
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Steven J Frank
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - David I Rosenthal
- Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Bonnie S Glisson
- Department of Thoracic Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Renata Ferrarotto
- Department of Thoracic Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Frank E Mott
- Department of Thoracic Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Faye M Johnson
- Department of Thoracic Head and Neck Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas.,Graduate School of Biomedical Sciences, University of Texas, Houston, Texas
| | - Jeffrey N Myers
- Department of Head and Neck Surgery, The University of Texas MD Anderson Cancer Center, Houston, Texas.,Graduate School of Biomedical Sciences, University of Texas, Houston, Texas
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Fukusumi T, Guo TW, Ren S, Haft S, Liu C, Sakai A, Ando M, Saito Y, Sadat S, Califano JA. Reciprocal activation of HEY1 and NOTCH4 under SOX2 control promotes EMT in head and neck squamous cell carcinoma. Int J Oncol 2020; 58:226-237. [PMID: 33491747 PMCID: PMC7864008 DOI: 10.3892/ijo.2020.5156] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2019] [Accepted: 10/08/2020] [Indexed: 12/12/2022] Open
Abstract
Several comprehensive studies have demonstrated that the NOTCH pathway is altered in a bimodal manner in head and neck squamous cell carcinoma (HNSCC). In a previous study, it was found that the NOTCH4/HEY1 pathway was specifically upregulated in HNSCC and promoted epithelial-mesenchymal transition (EMT), and that HEY1 activation supported SOX2 expression. However, the interactions in this pathway have not yet been fully elucidated. The present study investigated the NOTCH4/HEY1/SOX2 axis in HNSCC using in vitro models and the Cancer Genome Atlas (TCGA) database. To explore the association, reporter and ChIP RT-qPCR assays using SOX2-overexpressing (SOX2-OE) cells were performed. The association between NOTCH4 and HEY1 was examined in the same manner using HEY1-overexpressing (HEY1-OE) cells. The results of the in vitro experiments indicated that HEY1 promoted EMT in the HNSCC cells. Furthermore, the overexpression of HEY1 also promoted sphere formation and increased murine xenograft tumorigenicity. Reporter assays and ChIP RT-qPCR experiments indicated that SOX2 regulated HEY1 expression via direct binding of the HEY1 promoter. HEY1 expression significantly correlated with SOX2 expression in primary lung SCC and other SCCs using the TCGA database. HEY1 also regulated NOTCH4 expression to create a positive reciprocal feedback loop. On the whole, the present study demonstrates that HEY1 expression in HNSCC is regulated via the promotion of SOX2 and promotes EMT. The NOTCH4/HEY1 pathway is specifically upregulated via a positive reciprocal feedback loop mediated by the HEY1-medaited regulation of NOTCH4 transcription, and SOX2 correlates with HEY1 expression in SCC from other primary sites.
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Affiliation(s)
- Takahito Fukusumi
- Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
| | - Theresa W Guo
- Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
| | - Shuling Ren
- Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
| | - Sunny Haft
- Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
| | - Chao Liu
- Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
| | - Akihiro Sakai
- Department of Otolaryngology‑Head and Neck Surgery, Tokai University, School of Medicine, Isehara, Kanagawa 259‑1193, Japan
| | - Mizuo Ando
- Department of Otolaryngology‑Head and Neck Surgery, University of Tokyo, Tokyo 113‑8655, Japan
| | - Yuki Saito
- Department of Otolaryngology‑Head and Neck Surgery, University of Tokyo, Tokyo 113‑8655, Japan
| | - Sayed Sadat
- Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
| | - Joseph A Califano
- Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
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6
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Sakai A, Ando M, Fukusumi T, Ren S, Liu C, Qualliotine J, Haft S, Sadat S, Saito Y, Guo TW, Xu G, Sasik R, Fisch KM, Gutkind JS, Fertig EJ, Molinolo AA, Califano JA. Aberrant expression of CPSF1 promotes head and neck squamous cell carcinoma via regulating alternative splicing. PLoS One 2020; 15:e0233380. [PMID: 32437477 PMCID: PMC7241804 DOI: 10.1371/journal.pone.0233380] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2020] [Accepted: 05/03/2020] [Indexed: 12/22/2022] Open
Abstract
Alternative mRNA splicing increases protein diversity, and alternative splicing events (ASEs) drive oncogenesis in multiple tumor types. However, the driving alterations that underlie the broad dysregulation of ASEs are incompletely defined. Using head and neck squamous cell carcinoma (HNSCC) as a model, we hypothesized that the genomic alteration of genes associated with the spliceosome may broadly induce ASEs across a broad range of target genes, driving an oncogenic phenotype. We identified 319 spliceosome genes and employed a discovery pipeline to identify 13 candidate spliceosome genes altered in HNSCC using The Cancer Genome Atlas (TCGA) HNSCC data. Phenotypic screens identified amplified and overexpressed CPSF1 as a target gene alteration that was validated in proliferation, colony formation, and apoptosis assays in cell line and xenograft systems as well as in primary HNSCC. We employed knockdown and overexpression assays followed by identification of ASEs regulated by CPSF1 overexpression to identify changes in ASEs, and the expression of these ASEs was validated using RNA from cell line models. Alterations in expression of spliceosome genes, including CPSF1, may contribute to HNSCC by mediating aberrant ASE expression.
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Affiliation(s)
- Akihiro Sakai
- Moores Cancer Center, University of California San Diego, San Diego, California, United States of America
- Department of Otolaryngology, Head and Neck Surgery, Tokai University, Isehara, Japan
| | - Mizuo Ando
- Moores Cancer Center, University of California San Diego, San Diego, California, United States of America
| | - Takahito Fukusumi
- Moores Cancer Center, University of California San Diego, San Diego, California, United States of America
| | - Shuling Ren
- Moores Cancer Center, University of California San Diego, San Diego, California, United States of America
- Department of Otolaryngology, Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Chao Liu
- Moores Cancer Center, University of California San Diego, San Diego, California, United States of America
- Department of Otolaryngology, Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Jesse Qualliotine
- Division of Otolaryngology, Head and Neck Surgery, Department of Surgery, University of California San Diego, San Diego, CA, United States of America
| | - Sunny Haft
- Moores Cancer Center, University of California San Diego, San Diego, California, United States of America
| | - Sayed Sadat
- Moores Cancer Center, University of California San Diego, San Diego, California, United States of America
| | - Yuki Saito
- Moores Cancer Center, University of California San Diego, San Diego, California, United States of America
| | - Theresa W. Guo
- Department of Otolaryngology, Head and Neck Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland, United States of America
| | - Guorong Xu
- Center for Computational Biology and Bioinformatics, Department of Medicine, University of California San Diego, San Diego, CA, United States of America
| | - Roman Sasik
- Center for Computational Biology and Bioinformatics, Department of Medicine, University of California San Diego, San Diego, CA, United States of America
| | - Kathleen M. Fisch
- Center for Computational Biology and Bioinformatics, Department of Medicine, University of California San Diego, San Diego, CA, United States of America
| | - J. Silvio Gutkind
- Department of Pharmacology, University of California San Diego, San Diego, CA, United States of America
| | - Elana J. Fertig
- Division of Oncology Biostatistics and Bioinformatics, Sidney Kimmel Comprehensive Cancer Center, Department of Oncology, Johns Hopkins University, Baltimore, MD, United States of America
| | - Alfredo A. Molinolo
- Department of Pathology, University of California San Diego, San Diego, California, United States of America
| | - Joseph A. Califano
- Moores Cancer Center, University of California San Diego, San Diego, California, United States of America
- Division of Otolaryngology, Head and Neck Surgery, Department of Surgery, University of California San Diego, San Diego, CA, United States of America
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7
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Haft S, Ren S, Xu G, Mark A, Fisch K, Guo TW, Khan Z, Pang J, Ando M, Liu C, Sakai A, Fukusumi T, Califano JA. Mutation of chromatin regulators and focal hotspot alterations characterize human papillomavirus-positive oropharyngeal squamous cell carcinoma. Cancer 2019; 125:2423-2434. [PMID: 30933315 DOI: 10.1002/cncr.32068] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Revised: 11/29/2018] [Accepted: 01/07/2019] [Indexed: 12/12/2022]
Abstract
BACKGROUND Human papillomavirus (HPV)-associated oropharyngeal cancer is a disease clinically and biologically distinct from smoking-related head and neck squamous cell carcinoma (HNSCC). Despite its rapidly increasing incidence, the mutational landscape of HPV+ oropharyngeal squamous cell carcinoma (OPSCC) remains understudied. METHODS This article presents the first mutational analysis of the 46 HPV+ OPSCC tumors within the newly expanded cohort of 530 HNSCC tumors from The Cancer Genome Atlas. A separate exome sequencing analysis was also performed for 46 HPV+ OPSCCs matched to their normal lymphocyte controls from the Johns Hopkins University cohort. RESULTS There was a strikingly high 33% frequency of mutations within genes associated with chromatin regulation, including mutations in lysine methyltransferase 2C (KMT2C), lysine methyltransferase 2D (KMT2D), nuclear receptor binding SET domain protein 1 (NSD1), CREB binding protein (CREBBP), E1A-associated protein p300 (EP300), and CCCTC-binding factor (CTCF). In addition, the commonly altered genes phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit α (PIK3CA) and fibroblast growth factor receptor 3 (FGFR3) showed distinct domain-specific hotspot mutations in comparison with their HPV- counterparts. PIK3CA showed a uniquely high rate of mutations within the helicase domain, and FGFR3 contained a predominance of hotspot S249C alterations that were not found in HPV- HNSCC. CONCLUSIONS This analysis represents one of the largest studies to date of HPV+ OPSCC and lends novel insight into the genetic landscape of this biologically distinct disease, including a high rate of mutations in histone- and chromatin-modifying genes, which may offer novel therapeutic targets.
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Affiliation(s)
- Sunny Haft
- Moores Cancer Center, University of California San Diego, La Jolla, California.,Division of Otolaryngology-Head and Neck Surgery, Department of Surgery, University of California San Diego, La Jolla, California
| | - Shuling Ren
- Moores Cancer Center, University of California San Diego, La Jolla, California.,Division of Otolaryngology-Head and Neck Surgery, Department of Surgery, University of California San Diego, La Jolla, California
| | - Guorong Xu
- Moores Cancer Center, University of California San Diego, La Jolla, California.,Center for Computational Biology and Bioinformatics, Department of Medicine, University of California San Diego, La Jolla, California
| | - Adam Mark
- Moores Cancer Center, University of California San Diego, La Jolla, California.,Center for Computational Biology and Bioinformatics, Department of Medicine, University of California San Diego, La Jolla, California
| | - Kathleen Fisch
- Moores Cancer Center, University of California San Diego, La Jolla, California.,Center for Computational Biology and Bioinformatics, Department of Medicine, University of California San Diego, La Jolla, California
| | - Theresa W Guo
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland
| | - Zubair Khan
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland
| | - John Pang
- Moores Cancer Center, University of California San Diego, La Jolla, California.,Division of Otolaryngology-Head and Neck Surgery, Department of Surgery, University of California San Diego, La Jolla, California
| | - Mizuo Ando
- Moores Cancer Center, University of California San Diego, La Jolla, California.,Department of Otolaryngology-Head and Neck Surgery, Tokyo University, Tokyo, Japan
| | - Chao Liu
- Moores Cancer Center, University of California San Diego, La Jolla, California.,Division of Otolaryngology-Head and Neck Surgery, Department of Surgery, University of California San Diego, La Jolla, California
| | - Akihiro Sakai
- Moores Cancer Center, University of California San Diego, La Jolla, California.,Department of Otolaryngology, Center of Head and Neck Surgery, Tokai University, Isehara, Japan
| | - Takahito Fukusumi
- Moores Cancer Center, University of California San Diego, La Jolla, California
| | - Joseph A Califano
- Moores Cancer Center, University of California San Diego, La Jolla, California.,Division of Otolaryngology-Head and Neck Surgery, Department of Surgery, University of California San Diego, La Jolla, California
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8
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Ren S, Gaykalova DA, Guo TW, Favorov AV, Fertig EJ, Khan Z, DeJong PM, Ando M, Liu C, Sakai A, Fukusumi T, Haft S, Sadat S, Gutkind JS, Koch WM, Califano JA. Abstract 3320: Discovery and development of DNA methylation biomarkers in human papillomavirus related oropharyngeal squamous cell carcinoma. Cancer Res 2018. [DOI: 10.1158/1538-7445.am2018-3320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Purpose: Human papillomavirus (HPV) related oropharyngeal squamous cell carcinoma (OPSCC) has an improved prognosis compared to cancers associated with tobacco and alcohol exposure, and also exhibits a different composition of epigenetic alterations. In this methylome-wide association study, we identified DNA methylation-based biomarkers with potential utility in screening for HPV positive OPSCC. Experimental Design: In the discovery stage, genome wide DNA methylation was measured using methyl-CpG binding domain protein-enriched genome sequencing (MBD-seq) in 50 HPV positive OPSCC tissues and 25 normal tissues. We defined 51 differentially methylated regions (DMRs) with maximal methylation specificity to cancer samples. We used TCGA methylation array data to evaluate the performance of the proposed candidates. Top 20 candidates were validated using quantitative methylation specific PCR (QMSP) in independent 24 HPV related OPSCCs and 22 controls. Results: Supervised hierarchical clustering of 51 DMRs based on TCGA methylation data found that HPV positive OPSCC had significantly higher DNA methylation levels compared to normal samples and head and neck squamous cell carcinoma (HNSCC) without HPV or with different tumor sites. The methylation levels of all top 20 candidates in HPV positive OPSCC were significantly higher than those in normal samples in TCGA data. 16 of these 20 candidates were found by QMSP to have significant higher methylation levels compared with controls. 2 candidates (CCDC181 and OR6S1) had a sensitivity of 100%, while 10 candidates (KCNA3, ITGA4, BEND4, ELMO1, SFMBT2, HOXB4, ZNF439, ZNF93, VSTM2B and ZNF773) had a specificity of 100%. Our 20 candidates were found by the receiver operating characteristic analysis to have a prediction accuracy ranging from 56.3% to 99.8%. Conclusions: This study discovered 20 epigenetic markers for detection of HPV related OPSCC, which can potentially be applied to develop a population based screening test and improve disease management.
Citation Format: Shuling Ren, Daria A. Gaykalova, Theresa W. Guo, Alexander V. Favorov, Elana J. Fertig, Zubair Khan, Peter M. DeJong, Mizuo Ando, Chao Liu, Akihiro Sakai, Takahito Fukusumi, Sunny Haft, Sayed Sadat, J Silvio Gutkind, Wayne M. Koch, Joseph A. Califano. Discovery and development of DNA methylation biomarkers in human papillomavirus related oropharyngeal squamous cell carcinoma [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2018; 2018 Apr 14-18; Chicago, IL. Philadelphia (PA): AACR; Cancer Res 2018;78(13 Suppl):Abstract nr 3320.
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Affiliation(s)
- Shuling Ren
- 1University of California San Diego, La Jolla, CA
| | | | | | | | | | - Zubair Khan
- 2Johns Hopkins Medical Institutions, Baltimore, MD
| | | | | | - Chao Liu
- 1University of California San Diego, La Jolla, CA
| | | | | | - Sunny Haft
- 1University of California San Diego, La Jolla, CA
| | - Sayed Sadat
- 1University of California San Diego, La Jolla, CA
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9
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Fukusumi T, Guo TW, Sakai A, Ando M, Ren S, Haft S, Liu C, Amornphimoltham P, Gutkind JS, Califano JA. The NOTCH4- HEY1 Pathway Induces Epithelial-Mesenchymal Transition in Head and Neck Squamous Cell Carcinoma. Clin Cancer Res 2017; 24:619-633. [PMID: 29146722 DOI: 10.1158/1078-0432.ccr-17-1366] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Revised: 09/16/2017] [Accepted: 11/09/2017] [Indexed: 12/26/2022]
Abstract
Purpose: Recently, several comprehensive genomic analyses demonstrated NOTCH1 and NOTCH3 mutations in head and neck squamous cell carcinoma (HNSCC) in approximately 20% of cases. Similar to other types of cancers, these studies also indicate that the NOTCH pathway is closely related to HNSCC progression. However, the role of NOTCH4 in HNSCC is less well understood.Experimental Design: We analyzed NOTCH4 pathway and downstream gene expression in the TCGA data set. To explore the functional role of NOTCH4, we performed in vitro proliferation, cisplatin viability, apoptosis, and cell-cycle assays. We also compared the relationships among NOTCH4, HEY1, and epithelial-mesenchymal transition (EMT)-related genes using the TCGA data set and in vitro assays.Results:HEY1 is specifically upregulated in HNSCC compared with normal tissues in the TCGA data set. NOTCH4 is more significantly related to HEY1 activation in HNSCC in comparison with other NOTCH receptors. NOTCH4 promotes cell proliferation, cisplatin resistance, inhibition of apoptosis, and cell-cycle dysregulation. Furthermore, NOTCH4 and HEY1 upregulation resulted in decreased E-cadherin expression and increased Vimentin, Fibronectin, TWIST1, and SOX2 expression. NOTCH4 and HEY1 expression was associated with an EMT phenotype as well as increased invasion and cell migration.Conclusions: In HNSCC, the NOTCH4-HEY1 pathway is specifically upregulated, induces proliferation and cisplatin resistance, and promotes EMT. Clin Cancer Res; 24(3); 619-33. ©2017 AACR.
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Affiliation(s)
- Takahito Fukusumi
- Moores Cancer Center, University of California San Diego, La Jolla, California
| | - Theresa W Guo
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland
| | - Akihiro Sakai
- Moores Cancer Center, University of California San Diego, La Jolla, California
| | - Mizuo Ando
- Moores Cancer Center, University of California San Diego, La Jolla, California
| | - Shuling Ren
- Moores Cancer Center, University of California San Diego, La Jolla, California
| | - Sunny Haft
- Moores Cancer Center, University of California San Diego, La Jolla, California
| | - Chao Liu
- Moores Cancer Center, University of California San Diego, La Jolla, California
| | | | - J Silvio Gutkind
- Moores Cancer Center, University of California San Diego, La Jolla, California
| | - Joseph A Califano
- Moores Cancer Center, University of California San Diego, La Jolla, California.
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Fukusumi T, Guo TW, Ren S, Sakai A, Ando M, Haft S, Liu C, Califano JA. Abstract 1332: NOTCH - HEY1 pathway induces EMT in head and neck squamous cell carcinoma. Cancer Res 2017. [DOI: 10.1158/1538-7445.am2017-1332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background
Head and neck squamous cell carcinoma (HNSCC) is noted to have a NOTCH mutation rate of 20% within the Cancer Genome Atlas (TCGA) dataset consistent with tumor suppressor gene status. However, NOTCH genes are also upregulated in wild type HNSCC and show signs of downstream activation in a substantial proportion of HNSCC. In this study, we aimed to further explore the potential for NOTCH pathways to be activated in HNSCC.
Material and Methods
mRNA sequence of TCGA data includes 520 HNSCC tumors and 46 normal tissues. We used 447 HNSCC excluding 73 tumors with NOTCH mutations. The activated groups of NOTCH downstream genes were defined as tumors with expression 1 standard deviation above the mean of normal tissue. We used four HNSCC cell lines (SKN3, Cal27, SCC61, SCC090) to ascertain the results of the TCGA analysis in vitro.
Result
In TCGA analysis, HEY1 activated HNSCC had significant more expression of NOTCH pathway genes. In particular NOTCH4 had the most significant correlation with HEY1 activation among NOTCH receptors. To confirm this result in vitro, HEY1 expression was compared between si-control and si-NOTCH4 of SKN3, Cal27, SCC61 and SCC090. As expected, HEY1 expression in all si-NOTCH4 treated cell lines were significant decreased. Next, we examined the relationship about NOTCH4 and an epithelial mesenchymal transition phenotype (EMT). Using TCGA data, we found that mesenchymal marker genes were significantly increased in high NOTCH4 group. In vitro experiments, si-NOTCH4 cells decreased mesenchymal marker gene expression such as Fibronectin and TWIST1. We also examined HEY1 function. Similar to NOTCH4, it was found that HEY1 is significantly related to EMT in silico and in vitro.
Conclusion
The NOTCH4-HEY1 pathway is significantly upregulated in HNSCC and induces EMT.
Citation Format: Takahito Fukusumi, Theresa W. Guo, Shuling Ren, Akihiro Sakai, Mizuo Ando, Sunny Haft, Chao Liu, Joseph A. Califano. NOTCH - HEY1 pathway induces EMT in head and neck squamous cell carcinoma [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2017; 2017 Apr 1-5; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2017;77(13 Suppl):Abstract nr 1332. doi:10.1158/1538-7445.AM2017-1332
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Ma J, Qin W, Wang XY, Guo TW, Bian L, Duan SW, Li XW, Zou FG, Fang YR, Fang JX, Feng GY, Gu NF, St Clair D, He L. Further evidence for the association between G72/G30 genes and schizophrenia in two ethnically distinct populations. Mol Psychiatry 2006; 11:479-87. [PMID: 16402132 DOI: 10.1038/sj.mp.4001788] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Recently, the nested genes G72 and G30 on chromosome 13q32-q33 have been implicated in the etiology of schizophrenia. We genotyped six single-nucleotide polymorphisms (SNPs: rs3916965, rs3916967, rs2391191, rs778294, rs779293 and rs3918342), which span approximately 82.5 kb in the region encompassing the G72/G30 genes in 1176 Han Chinese subjects (588 cases and 588 controls) and 365 Scottish subjects (183 cases and 182 controls). Significant association between an allele of marker rs778293 and schizophrenia was found in our Chinese samples (P = 0.0013), and was replicated in the Scottish samples (P = 0.022). LD analysis revealed that four SNPs between rs3916965 and rs778294 were in LD, called block I, and the two distal SNPs (rs778293 and rs3918342) constituted a block II in both the Chinese and Scottish samples. We selected one SNP from each block (rs778294 from block I and rs778293 from block II), and then analyzed the haplotypes. A significant difference was observed for the common haplotype GC in the Chinese sample (P = 0.0145), and was replicated in the Scottish sample (P = 0.003). On meta-analysis, we separately analyzed the studies in Asian and European populations because of significant heterogeneity in the homogeneity test. We found a statistically significant association between rs778293 and schizophrenia in Asian populations, but no difference was found between cases and controls in the European populations. Overall, our data give further support to the existing evidence that G72/G30 genes are involved in conferring susceptibility to schizophrenia.
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Affiliation(s)
- J Ma
- Bio-X Center, Shanghai Jiao Tong University, Shanghai, People's Republic of China
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12
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Bian L, Yang JD, Guo TW, Sun Y, Duan SW, Chen WY, Pan YX, Feng GY, He L. Insulin-degrading enzyme and Alzheimer disease: a genetic association study in the Han Chinese. Neurology 2005; 63:241-5. [PMID: 15277615 DOI: 10.1212/01.wnl.0000129987.70037.db] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND The gene for insulin-degrading enzyme (IDE) represents a strong positional and biologic candidate for late-onset Alzheimer disease (LOAD) susceptibility. IDE is located on chromosome 10q23.3 close to a region of linkage for LOAD. In addition, many studies have identified a possible role of IDE in the degradation of amyloid beta-protein and the intracellular amyloid precursor protein (APP) domain released by gamma-secretase processing. OBJECTIVE To examine the association of IDE with AD in the Han Chinese. METHODS Four IDE polymorphisms (three in 5'-untranslated region and one in intron 21) were analyzed, using a population of 210 patients with LOAD and 200 control subjects well matched for age, sex, and ethnic background. RESULTS Among the four polymorphisms studied, only the C allele of single-nucleotide polymorphism (SNP) IDE2 showed association with AD (p = 0.005). Stratification of the data by APOE epsilon4 status indicated that the association between IDE2 and AD was confined to APOE epsilon4 carriers only. No association was found between all variants studied and AD within APOE epsilon4-negative subjects. The global haplotype frequencies showed significant differences between AD patients and control subjects. Furthermore, overrepresentation of GCTG haplotype in the AD group was found. It may be a risk haplotype for AD. CONCLUSIONS These results suggest a possible synergic interaction between IDE and APOE epsilon4 in the risk to develop late-onset sporadic AD. IDE might modify the effect of the APOE epsilon4 risk factor in the Han Chinese population.
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Affiliation(s)
- L Bian
- Institute for Nutritional Sciences, Chinese Academy of Sciences, China
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13
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Yang MS, Yu L, Guo TW, Zhu SM, Liu HJ, Shi YY, Gu NF, Feng GY, He L. Evidence for association between single nucleotide polymorphisms in T complex protein 1 gene and schizophrenia in the Chinese Han population. J Med Genet 2004; 41:e63. [PMID: 15121791 PMCID: PMC1735778 DOI: 10.1136/jmg.2003.011023] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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14
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Zhang YM, Guo TW, Li ZC. Evaluation of the new TAMZ titanium alloy for dental cast application. Chin J Dent Res 2000; 3:54-8. [PMID: 11314090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
OBJECTIVE To reveal the potential of the new titanium alloy as dental prosthodontic materials. METHODS Dental castings of TAMZ alloy were investigated in the casting machine specially designed for titanium. A mesh pattern was used to count the castability value. The mechanical properties were measured by means of a universal testing machine. Optical micrography was done on the exposed cross-section of TAMZ alloy casting. From the surface to the inner part the Knoop hardness in reacted layer of TAMZ alloy casting was measured. The structure and elemental analyses of the reacted layer were made by SEM and element line scanning observation. RESULTS The castability value (Cv = 98%) and the tensile test (sigma b = 850 Mpa, sigma 0.2 = 575 Mpa, delta = 7.33%) data were collected. The castings microstructure showed main alpha phase and small beta phase. Knoop hardness in the surface reacted layer was greater than that in the inner part. From the SEM and element line scanning observation, there are three different layers in the surface reacted layer of the TAMZ alloy castings, and higher level of element of O, Al, Si and Zr were found in the reacted layer while the Si permeated deeper than others. CONCLUSION TAMZ alloy can be accepted as a material for dental alloy in prosthodontics.
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Affiliation(s)
- Y M Zhang
- Department of Prosthodontics, College of Stomatology, Fourth Military Medical University (FMMU), Xian 710032, P. R. China. wqtzym#fmmu.edu.cn
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Shi CS, Mao Y, Guo TW. Correlation between autoregressive moving-average model parameters of electromyogram of human jaw closing muscles and maximum clenching time at intercuspal position. J Oral Rehabil 1994; 21:559-63. [PMID: 7996340 DOI: 10.1111/j.1365-2842.1994.tb01170.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
During maximum clenching in the intercuspal position, surface electromyograms of left masseter and anterior temporal muscles were sampled in 16 healthy subjects with natural dentitions to establish a four-order, autoregressive (AR) moving-average (MA) model of the myoelectrical signals. The correlation coefficients and the linear regression between the model parameters and the clenching time were calculated. The model parameters had the positive or the negative correlation, and AR model parameters had the higher correlation than MA model parameters. The model parameters relate to muscular fatigue and the slope of the regressive equation relates to the endurance time of the isometric contraction.
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Affiliation(s)
- C S Shi
- Prosthodontic Department, Stomatological College, Fourth Military Medical University, Xian Shaanxi, China
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16
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Shi SG, Oyang G, Guo TW. [Effects of the orientation of occlusal plane on EMG of masticatory muscles in complete denture wearers]. Zhonghua Kou Qiang Yi Xue Za Zhi 1994; 29:234-7, 255. [PMID: 7859577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The occlusal plane was designed as parallel to Camper's line (the standard dentures) and 5 degree inclined upward, downward laterally and anterior-posterior for comparing the activities of masticatory muscles. Following results were obtained: (1) the amplitude of the masseter (Mm) and the anterior temporalis (Ta) muscles with standard dentures biting in intercuspal position were the highest among those with other dentures, (2) during unilateral chewing with standard dentures, the average amplitude of the anterior digastric muscles (Da) on the balanced side was higher than that on the working side, but the amplitude values of the Mm and the Ta on the working side were significantly lower than those on the opposite side, (3) to incline the plane forward or backward may cause the activity of the Da increased in the balanced side and (4) to incline the plane right or left the amplitude of Ta and Mm between the working and the balanced side was not significant different.
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Affiliation(s)
- S G Shi
- College of Stomatology, Fourth Military Medical University, Xi'an
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17
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Abstract
The EMG signals from left and right masseter and anterior temporal muscles of 40 healthy subjects were sampled at rest position and through gradually increased clench level to maximum voluntary contraction (MVC) at intercuspal position. A visual sense feedback of masseter muscle potential value was used for the subject to control clench level. The relationship between mean power frequency (MPF) and potential of EMG was investigated by a curvilinear regression of the second order. It was found that the relationship was of the second order logarithmic curve with maximum value of MPF. With the raising of the potential levels of EMG, the MPF increased at the lower clench levels and decreased at higher clench levels. The results indicate that controlling an identical clench level is necessary for using MPF to describe the functional state of masticatory muscles in the clinical situation.
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Affiliation(s)
- C S Shi
- Prosthodontic Department, Stomatological College, Fourth Military Medical University, Xian Shaanxi, People's Republic of China
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18
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Guo TW, Huang CW. [Repair and refabrication of removable denture]. Shanghai Kou Qiang Yi Xue 1993; 2:54. [PMID: 15159886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
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19
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Mao Y, Shi CS, Guo TW. Discrimination of clenches at varied jaw positions using autoregressive model coefficients of myoelectrical activities of anterior temporal and masseter muscles. J Oral Rehabil 1992; 19:449-55. [PMID: 1453257 DOI: 10.1111/j.1365-2842.1992.tb01109.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
During 10% maximum clenching at intercuspal, protruded, retruded contact and lateral positions, the surface electromyograms (EMG) of bilateral anterior temporal and masseter muscles of 20 normal subjects with intact natural dentitions were recorded. The autoregressive (AR) model of the sampled EMG was then built and the obtained coefficients of the AR model were accepted as featured parameters of the EMG. Finally Bayes' stepwise discriminant analysis was used for establishing discriminant functions of estimating low level clenches at varied jaw positions. It was found that total conformation rates of internal and external sample substitution (15 and 5 subjects) were 82.67% and 78% respectively; the discriminant effect between intercuspal and retruded contact position was not up to predicted standard. The results indicate that AR model coefficients may describe the characteristics of surface EMG of masticatory muscles and easily be used in multiple statistical analysis, from which the classification and diagnosis may be taken.
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Affiliation(s)
- Y Mao
- Prosthodontic Department, Stomatological College, Fourth Military Medical University, Xian Shaanxi, Peoples' Republic of China
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20
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Abstract
Power spectral analysis of electromyogram (ENG) was used to investigate the relationship between mean power frequency (MPF) and sustained contraction time. Surface EMG activity was recorded from masseter and anterior temporal muscles on both sides for seven healthy subjects while clenching at intercuspal position in maximum potential level of these muscles. A visual sense feedback of EMG potential was used to control clenching level. According to linear regression analysis, there was a negative correlation between MPF of EMG and sustained contraction time. The results indicate that the slope of MPF versus contraction time may be used for detecting muscular fatigue in the stomatognathic system.
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Affiliation(s)
- C S Shi
- Prosthodontic Department, Stomatological Hospital, Fourth Military Medical University, Xian Shaanxi, Peoples' Republic of China
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21
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Abstract
A computer system was used for simultaneously collecting and processing mandibular movements and the myoelectric activities of the masticatory muscles of 15 dentate subjects and 11 complete denture wearers. The displacement, velocity, cycle of mandibular movements, and the muscular mean potentials were indices in observing mastication. A good complete denture should perform with physiologic characteristics, and restore masticatory function and oral health. The kinetic energy from the velocities of lateral and vertical directions can serve for the chewing and comminution of food, but lateral comminution may affect denture retention. The mean myoelectrical potentials of the mandibular elevator muscles of complete denture wearers tend to increase at the opening phase; however, the potentials decrease at the closing phase.
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Affiliation(s)
- C S Shi
- Department of Prosthodontics, Fourth Military Medical University, Stomatological College, Xian Shaanxi, People's Republic of China
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Abstract
Fifteen subjects with complete natural dentitions were selected for investigation of their occlusal sounds on the left and right sides by means of power spectral analysis. It was found that the occlusal sounds consisted of various frequency components. Their mean power frequencies (MPF) and frequencies at 10, 20, 50, 80 and 90% of cumulative power (F10, F20, F50, F80, F90) on the left and right sides were almost identical (P greater than 0.05). The correlation coefficients between MPF and F50, MPF and F50 with the others were high. The results indicate that F20, MPF or F50 and F80 may be used as indices to describe the power spectral shape, and that power spectral analysis of occlusal sounds may be used as a contribution to diagnosis of occlusal conditions.
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Affiliation(s)
- C S Shi
- Prosthodontic Department, Stomatological College, Fourth Military Medical University, Xian Shaanxi People's Republic of China
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Abstract
Thirteen normal subjects were selected for this investigation. At the vertical dimension of rest position and habitual clench, their myoelectric activities of the masseter, anterior and posterior temporal, and digastric muscles on the left and right sides were simultaneously sampled and processed by computer, and the mean power frequency (MPF) and the mean amplitude (MA) of the myoelectric signal were calculated. At rest position, the temporal muscles were major muscles and the MPF differences of various masticatory muscles were not significant. At habitual clench, with the increase in MA, the MPF of various muscles increased. The results show that MPF may have application in describing a central tendency of myoelectrical signal frequency distribution and in evaluating recruitment of motor units. MPF and MA are the quantitative indices reflecting masticatory muscle function.
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Affiliation(s)
- C S Shi
- Prosthodontic Department, Fourth Military Medical University, Stomatological College, Xian Shaanxi, P.R. China
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Abstract
The size of soya particles masticated by 10 subjects with natural teeth were directly measured by means of a graphic digitizer and a computer at a varied number of masticatory strokes. The statistical parameters were calculated by computer and a test of normality was used for estimating the frequency distribution. It was found that the frequency distribution of chewed particle size was a positive skew state; its shape was asymmetric, wide, and flat. After natural logarithm transformation the distribution tended toward normal. Increasing the number of masticatory strokes decreased the mean and median of the distribution (p less than 0.01) and did not change the coefficient of variation, skewness, and kurtosis (p greater than 0.05). The results show that the distribution of chewed particle size tends toward a normal logarithmic distribution; the distribution shapes at various numbers of strokes are the same; these parameters can be used for determining masticatory efficiency. Direct measurement of the particles is more convenient and reliable than dyeing particles or fractionating the particles in a sieve system.
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Affiliation(s)
- C S Shi
- Prosthodontic Department, Fourth Military Medical College, Stomatological Hospital, Xian Shaanxi, The People's Republic of China
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Abstract
The sizes of soya particles masticated by 12 complete denture wearers and 10 subjects with natural dentition were directly measured by means of a graphic digitizer and computer, following a varied number of chewing strokes. It was found that the chewed particle size frequency distributions of the two groups tended to a state of normal logarithm distribution. Compared with the dentate subjects, the mean, 20th, 50th and 80th percentile of the particle sizes chewed by complete denture wearers were increased, whilst the distribution shapes were nearly identical. The results suggest that there are no qualitative differences in the manner in which the two groups break up food. Selection and breakage functions of complete denture wearers are decreased, and this could be related to the denture conditions and the change of oral state in such individuals.
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Affiliation(s)
- C S Shi
- Prosthodontic Department, Stomatological Hospital, Fourth Military Medical College, Xian Shaanxi, People's Republic of China
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Guo TW. [Discussion on the reference plane of inclination of condylar guidance]. Zhonghua Kou Qiang Yi Xue Za Zhi 1988; 23:274-5, 318-9. [PMID: 3234138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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