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==Overview==
==Overview==
Common [[causes]] of nasopharyngeal carcinoma include [[Epstein Barr virus]] ([[EBV infection|EBV infection)]], [[Human papillomavirus|Human Papillomavirus]] ([[HPV infection]]), and consumption of salted fish as a source of N-nitrosamine.
Common [[causes]] of nasopharyngeal carcinoma include [[Epstein Barr virus]] ([[EBV infection|EBV infection)]], [[Human papillomavirus|Human Papillomavirus]] ([[HPV infection]]), and consumption of salted fish as a source of N-[[nitrosamine]].


==Causes==
==Causes==
===Common Causes===
===Common Causes===
Common [[causes]] of nasopharyngeal carcinoma may include:
Common [[causes]] of nasopharyngeal carcinoma may include:<ref name="JiaQin2012">{{cite journal|last1=Jia|first1=Wei-Hua|last2=Qin|first2=Hai-De|title=Non-viral environmental risk factors for nasopharyngeal carcinoma: A systematic review|journal=Seminars in Cancer Biology|volume=22|issue=2|year=2012|pages=117–126|issn=1044579X|doi=10.1016/j.semcancer.2012.01.009}}</ref><ref name="JiaLuo2010">{{cite journal|last1=Jia|first1=Wei-Hua|last2=Luo|first2=Xiang-Yu|last3=Feng|first3=Bing-Jian|last4=Ruan|first4=Hong-Lian|last5=Bei|first5=Jin-Xin|last6=Liu|first6=Wen-Sheng|last7=Qin|first7=Hai-De|last8=Feng|first8=Qi-Sheng|last9=Chen|first9=Li-Zhen|last10=Yao|first10=Shugart Yin|last11=Zeng|first11=Yi-Xin|title=Traditional Cantonese diet and nasopharyngeal carcinoma risk: a large-scale case-control study in Guangdong, China|journal=BMC Cancer|volume=10|issue=1|year=2010|issn=1471-2407|doi=10.1186/1471-2407-10-446}}</ref><ref name="GuoJohnson2009">{{cite journal|last1=Guo|first1=Xiuchan|last2=Johnson|first2=Randall C.|last3=Deng|first3=Hong|last4=Liao|first4=Jian|last5=Guan|first5=Li|last6=Nelson|first6=George W.|last7=Tang|first7=Mingzhong|last8=Zheng|first8=Yuming|last9=de The|first9=Guy|last10=O'Brien|first10=Stephen J.|last11=Winkler|first11=Cheryl A.|last12=Zeng|first12=Yi|title=Evaluation of nonviral risk factors for nasopharyngeal carcinoma in a high-risk population of Southern China|journal=International Journal of Cancer|volume=124|issue=12|year=2009|pages=2942–2947|issn=00207136|doi=10.1002/ijc.24293}}</ref><ref name="MaxwellKumar2009">{{cite journal|last1=Maxwell|first1=Jessica H.|last2=Kumar|first2=Bhavna|last3=Feng|first3=Felix Y.|last4=McHugh|first4=Jonathan B.|last5=Cordell|first5=Kitrina G.|last6=Eisbruch|first6=Avraham|last7=Worden|first7=Francis P.|last8=Wolf|first8=Gregory T.|last9=Prince|first9=Mark E.|last10=Moyer|first10=Jeffrey S.|last11=Teknos|first11=Theodoros N.|last12=Chepeha|first12=Douglas B.|last13=Stoerker|first13=Jay|last14=Walline|first14=Heather|last15=Carey|first15=Thomas E.|last16=Bradford|first16=Carol R.|title=HPV-positive/p16-positive/EBV-negative nasopharyngeal carcinoma in white North Americans|journal=Head & Neck|year=2009|pages=NA–NA|issn=10433074|doi=10.1002/hed.21216}}</ref><ref name="ChanLo2014">{{cite journal|last1=Chan|first1=Yap-Hang|last2=Lo|first2=Ching-Man|last3=Lau|first3=Hiu-Ying|last4=Lam|first4=Tai-Hing|title=Vertically transmitted nasopharyngeal infection of the human papillomavirus: Does it play an aetiological role in nasopharyngeal cancer?|journal=Oral Oncology|volume=50|issue=5|year=2014|pages=326–329|issn=13688375|doi=10.1016/j.oraloncology.2013.12.025}}</ref><ref name="DoganHedberg2014">{{cite journal|last1=Dogan|first1=Snjezana|last2=Hedberg|first2=Matthew L.|last3=Ferris|first3=Robert L.|last4=Rath|first4=Tanya J.|last5=Assaad|first5=Adel M.|last6=Chiosea|first6=Simion I.|title=Human papillomavirus and Epstein-Barr virus in nasopharyngeal carcinoma in a low-incidence population|journal=Head & Neck|volume=36|issue=4|year=2014|pages=511–516|issn=10433074|doi=10.1002/hed.23318}}</ref><ref name="StenmarkMcHugh2014">{{cite journal|last1=Stenmark|first1=Matthew H.|last2=McHugh|first2=Jonathan B.|last3=Schipper|first3=Matthew|last4=Walline|first4=Heather M.|last5=Komarck|first5=Christine|last6=Feng|first6=Felix Y.|last7=Worden|first7=Francis P.|last8=Wolf|first8=Gregory T.|last9=Chepeha|first9=Douglas B.|last10=Prince|first10=Mark E.|last11=Bradford|first11=Carol R.|last12=Mukherji|first12=Suresh K.|last13=Eisbruch|first13=Avraham|last14=Carey|first14=Thomas E.|title=Nonendemic HPV-Positive Nasopharyngeal Carcinoma: Association With Poor Prognosis|journal=International Journal of Radiation Oncology*Biology*Physics|volume=88|issue=3|year=2014|pages=580–588|issn=03603016|doi=10.1016/j.ijrobp.2013.11.246}}</ref><ref>{{Cite journal
*[[EBV infection]] : EBV infection
| author = [[Radha Raghupathy]], [[Edwin Pun Hui]] & [[Anthony Tak Cheung Chan]]
*[[HPV infection]]
| title = Epstein-Barr virus as a paradigm in nasopharyngeal cancer: from lab to clinic
*Consumption of salted fish as a source of N-nitrosamine
| journal = [[American Society of Clinical Oncology educational book. American Society of Clinical Oncology. Annual Meeting]]
| pages = 149–153
| year = 2014
| month =
| doi = 10.14694/EdBook_AM.2014.34.149
| pmid = 24857071
}}</ref><ref name="PathmanathanPrasad1995">{{cite journal|last1=Pathmanathan|first1=Rajadurai|last2=Prasad|first2=Umapati|last3=Sadler|first3=Robert|last4=Flynn|first4=Kathryn|last5=Raab-Traub|first5=Nancy|title=Clonal Proliferations of Cells Infected with Epstein–Barr Virus in Preinvasive Lesions Related to Nasopharyngeal Carcinoma|journal=New England Journal of Medicine|volume=333|issue=11|year=1995|pages=693–698|issn=0028-4793|doi=10.1056/NEJM199509143331103}}</ref><ref>{{Cite journal
| author = [[A. S. Chan]], [[K. F. To]], [[K. W. Lo]], [[K. F. Mak]], [[W. Pak]], [[B. Chiu]], [[G. M. Tse]], [[M. Ding]], [[X. Li]], [[J. C. Lee]] & [[D. P. Huang]]
| title = High frequency of chromosome 3p deletion in histologically normal nasopharyngeal epithelia from southern Chinese
| journal = [[Cancer research]]
| volume = 60
| issue = 19
| pages = 5365–5370
| year = 2000
| month = October
| pmid = 11034072
}}</ref>


EBV infection is perhaps the most extensively studied
*[[EBV infection]]: Role of [[EBV infection]] in the [[pathogenesis]] of nasopharyngeal carcinoma is established. Detection of [[EBV]] [[DNA]] and [[EBV]] [[gene expression]] even in the first phases of [[tumor]] [[transformation]] in all [[tumor cell]]<nowiki/>s confirmed this role.
 
*[[HPV infection]]: [[Human papillomavirus|HPV infection]] is [[Association|associated]] with the non-[[endemic]] form of nasopharyngeal carcinoma. The [[Patient|patients]] with [[Human papillomavirus|HPV]] positive nasopharyngeal carcinoma has poor [[prognosis]] rather than the [[Epstein Barr virus|EBV]] positive ones.
aetiological factor for nasopharyngeal carcinoma. On the
*Consumption of salted fish: N-[[nitrosamine]] in salted fish acts as a [[carcinogenic]] factor on nasopharyngeal cells. [[Individual|Individuals]] who start consumption of salted fish from their [[childhood]] have a greater risk to [[Development|develop]] NPC rather than the ones who start in their adulthood.
 
basis of in-situ hybridisation techniques to EBV-encoded
 
RNAs, the virus is detected exclusively in all tumour cells
 
but not in normal nasopharyngeal epithelium, suggesting
 
that EBV activation is necessary in the pathogenesis of
 
nasopharyngeal carcinoma. This notion is further
 
supported by reports that similar techniques undertaken
 
on preinvasive lesions identifi ed the presence of EBV even
 
during the initial phases of malignant transformation.6,7
 
Yet, the inability to detect EBV in nasopharyngeal biopsy
 
samples from high-risk individuals suggests that other
 
factors are needed for the EBV-infected epithelial cell to
 
undergo malignant transformation. Recent work has
 
proposed that deregulation of cell-cycle checkpoint
 
through p16 inactivation and cyclin D1 overexpression
 
promotes maintenance of the viral genome, favouring
 
transition of low-grade dysplasia to higher grade lesions.8,9
 
Intrinsic genetic determinants such as 3p and 9p deletions
 
have also been suggested as mechanisms of susceptibility
 
to EBV infection and its downstream eff ects.10 Epigenetic
 
modifi cations that are associated with a tumorigenic
 
phenotype have been identifi ed in EBV-infected epithelial
 
cells and were shown to persist even in the absence of the
 
virus (appendix).
 
[[Category: (name of the system)]]
==References==
==References==
{{Reflist|2}}
{{Reflist|2}}


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Latest revision as of 22:53, 29 July 2020

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Homa Najafi, M.D.[2]Faizan Sheraz, M.D. [3]

Overview

Common causes of nasopharyngeal carcinoma include Epstein Barr virus (EBV infection), Human Papillomavirus (HPV infection), and consumption of salted fish as a source of N-nitrosamine.

Causes

Common Causes

Common causes of nasopharyngeal carcinoma may include:[1][2][3][4][5][6][7][8][9][10]

References

  1. Jia, Wei-Hua; Qin, Hai-De (2012). "Non-viral environmental risk factors for nasopharyngeal carcinoma: A systematic review". Seminars in Cancer Biology. 22 (2): 117–126. doi:10.1016/j.semcancer.2012.01.009. ISSN 1044-579X.
  2. Jia, Wei-Hua; Luo, Xiang-Yu; Feng, Bing-Jian; Ruan, Hong-Lian; Bei, Jin-Xin; Liu, Wen-Sheng; Qin, Hai-De; Feng, Qi-Sheng; Chen, Li-Zhen; Yao, Shugart Yin; Zeng, Yi-Xin (2010). "Traditional Cantonese diet and nasopharyngeal carcinoma risk: a large-scale case-control study in Guangdong, China". BMC Cancer. 10 (1). doi:10.1186/1471-2407-10-446. ISSN 1471-2407.
  3. Guo, Xiuchan; Johnson, Randall C.; Deng, Hong; Liao, Jian; Guan, Li; Nelson, George W.; Tang, Mingzhong; Zheng, Yuming; de The, Guy; O'Brien, Stephen J.; Winkler, Cheryl A.; Zeng, Yi (2009). "Evaluation of nonviral risk factors for nasopharyngeal carcinoma in a high-risk population of Southern China". International Journal of Cancer. 124 (12): 2942–2947. doi:10.1002/ijc.24293. ISSN 0020-7136.
  4. Maxwell, Jessica H.; Kumar, Bhavna; Feng, Felix Y.; McHugh, Jonathan B.; Cordell, Kitrina G.; Eisbruch, Avraham; Worden, Francis P.; Wolf, Gregory T.; Prince, Mark E.; Moyer, Jeffrey S.; Teknos, Theodoros N.; Chepeha, Douglas B.; Stoerker, Jay; Walline, Heather; Carey, Thomas E.; Bradford, Carol R. (2009). "HPV-positive/p16-positive/EBV-negative nasopharyngeal carcinoma in white North Americans". Head & Neck: NA–NA. doi:10.1002/hed.21216. ISSN 1043-3074.
  5. Chan, Yap-Hang; Lo, Ching-Man; Lau, Hiu-Ying; Lam, Tai-Hing (2014). "Vertically transmitted nasopharyngeal infection of the human papillomavirus: Does it play an aetiological role in nasopharyngeal cancer?". Oral Oncology. 50 (5): 326–329. doi:10.1016/j.oraloncology.2013.12.025. ISSN 1368-8375.
  6. Dogan, Snjezana; Hedberg, Matthew L.; Ferris, Robert L.; Rath, Tanya J.; Assaad, Adel M.; Chiosea, Simion I. (2014). "Human papillomavirus and Epstein-Barr virus in nasopharyngeal carcinoma in a low-incidence population". Head & Neck. 36 (4): 511–516. doi:10.1002/hed.23318. ISSN 1043-3074.
  7. Stenmark, Matthew H.; McHugh, Jonathan B.; Schipper, Matthew; Walline, Heather M.; Komarck, Christine; Feng, Felix Y.; Worden, Francis P.; Wolf, Gregory T.; Chepeha, Douglas B.; Prince, Mark E.; Bradford, Carol R.; Mukherji, Suresh K.; Eisbruch, Avraham; Carey, Thomas E. (2014). "Nonendemic HPV-Positive Nasopharyngeal Carcinoma: Association With Poor Prognosis". International Journal of Radiation Oncology*Biology*Physics. 88 (3): 580–588. doi:10.1016/j.ijrobp.2013.11.246. ISSN 0360-3016.
  8. Radha Raghupathy, Edwin Pun Hui & Anthony Tak Cheung Chan (2014). "Epstein-Barr virus as a paradigm in nasopharyngeal cancer: from lab to clinic". American Society of Clinical Oncology educational book. American Society of Clinical Oncology. Annual Meeting: 149–153. doi:10.14694/EdBook_AM.2014.34.149. PMID 24857071.
  9. Pathmanathan, Rajadurai; Prasad, Umapati; Sadler, Robert; Flynn, Kathryn; Raab-Traub, Nancy (1995). "Clonal Proliferations of Cells Infected with Epstein–Barr Virus in Preinvasive Lesions Related to Nasopharyngeal Carcinoma". New England Journal of Medicine. 333 (11): 693–698. doi:10.1056/NEJM199509143331103. ISSN 0028-4793.
  10. A. S. Chan, K. F. To, K. W. Lo, K. F. Mak, W. Pak, B. Chiu, G. M. Tse, M. Ding, X. Li, J. C. Lee & D. P. Huang (2000). "High frequency of chromosome 3p deletion in histologically normal nasopharyngeal epithelia from southern Chinese". Cancer research. 60 (19): 5365–5370. PMID 11034072. Unknown parameter |month= ignored (help)

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