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{{Retinoblastoma}}
{{Retinoblastoma}}
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{{CMG}}; {{AE}} {{Simrat}} {{Sahar}}
==Overview==
==Overview==
Retinoblastoma is caused by  
Retinoblastoma may be caused by [[mutation]] in both [[Allele|alleles]] of [[RB1]] [[tumor suppressor gene]] or due to [[somatic]] amplification of the ''MYCN'' [[oncogene]].
==Causes==
==Causes==
[[Retinoblastoma]] is caused by the abnormal overgrowth of retinal cells. This tumor mostly arises from a mutational change on long arm of chromosome 13. However, it may also occur due to
'''[[Heritable]] Retinoblastoma'''
'''Heritable retinoblastoma'''
*In [[Child|children]] with the [[heritable]] [[genetic]] form of retinoblastoma, there is a [[mutation]] of ''[[RB1]]'' [[gene]] on [[chromosome 13]].<ref name="DuPogoriler2006">{{cite journal|last1=Du|first1=W|last2=Pogoriler|first2=J|title=Retinoblastoma family genes|journal=Oncogene|volume=25|issue=38|year=2006|pages=5190–5200|issn=0950-9232|doi=10.1038/sj.onc.1209651}}</ref>  
*In children with the heritable genetic form of retinoblastoma there is a [[mutation]] on [[chromosome 13]], called the ''[[RB1]]'' [[gene]].<ref name="DuPogoriler2006">{{cite journal|last1=Du|first1=W|last2=Pogoriler|first2=J|title=Retinoblastoma family genes|journal=Oncogene|volume=25|issue=38|year=2006|pages=5190–5200|issn=0950-9232|doi=10.1038/sj.onc.1209651}}</ref> The defective ''[[RB1]]'' [[gene]] can be inherited from either parent; in some children, however, the mutation occurs in the early stages of fetal development. Inheritance is [[autosomal dominant]] with 90% penetrance.<ref name="wiki">  Retinoblastoma. Wikipedia(2015) https://en.wikipedia.org/wiki/Retinoblastoma Accessed on October 10, 2015</ref>  
*[[Somatic]] amplification of the ''MYCN'' [[oncogene]] is responsible for some cases of [[Heredity|non-hereditary]], early-onset, aggressive, and unilateral retinoblastoma.
*The development of retinoblastoma can be explained by the two-hit model. According to the two-hit model, two events are necessary for the [[retinal]] [[cell]] or cells to develop into [[tumors]]. The first mutational event can be inherited (germline or constitutional) and would then be present in all cells in the body. The second “hit” results in the loss of the remaining normal allele ([[gene]]) and occurs within a particular retinal cell. In the sporadic, nonheritable form of retinoblastoma, both mutational events occur within a single retinal cell after fertilization (somatic events), resulting in unilateral retinoblastoma.
'''Sporadic Heritable Retinoblastoma'''
*Somatic amplification of the ''MYCN'' [[oncogene]] is responsible for some cases of non-hereditary, early-onset, aggressive, unilateral retinoblastoma.
*The exact cause of the sporadic [[Heritability|heritable]] form of the [[disease]] is still unclear.  
'''Sporadic heritable retinoblastoma'''
*Since the sporadic form of retinoblastoma occurs due to a new [[germline mutation]], it should occur before [[conception]]. For this reason, [[Conception|preconception]] exposure to [[Mutagen|mutagens]] is [[Hypothesis|hypothesized]] to be a potential [[risk factors|risk factor]].<ref>{{cite book | last = Singh | first = Arun | title = Clinical ophthalmic oncology | publisher = Elsevier Saunders | location = Edinburgh | year = 2007 | isbn = 978-1-4160-3167-3 }}</ref>
*The exact cause of the sporadic heritable form of the disease is still unclear.  
*[[13q deletion syndrome]] may also cause retinoblastoma. However, the [[tumor]] tends to occur at a later age and unilaterally.<ref name="ClarkAvishay2015">{{cite journal|last1=Clark|first1=Robin D.|last2=Avishay|first2=Stefanie G.|title=Retinoblastoma: Genetic Counseling and Testing|year=2015|pages=77–88|doi=10.1007/978-3-662-43451-2_8}}</ref>
*Since the sporadic form of retinoblastoma occurs due to a new germline mutation, it should occur before the conception. For this reason, preconception exposure to mutagens is hypothesized to be the potential risk factors.<ref>{{cite book | last = Singh | first = Arun | title = Clinical ophthalmic oncology | publisher = Elsevier Saunders | location = Edinburgh | year = 2007 | isbn = 978-1-4160-3167-3 }}</ref>
*13q deletion syndrome may also cause retinoblastoma. However, the tumor tends to occur at a later age and unilaterally.<ref name="ClarkAvishay2015">{{cite journal|last1=Clark|first1=Robin D.|last2=Avishay|first2=Stefanie G.|title=Retinoblastoma: Genetic Counseling and Testing|year=2015|pages=77–88|doi=10.1007/978-3-662-43451-2_8}}</ref>
*For more information [[Retinoblastoma risk factors|click here]].
 
==References==
==References==
{{reflist|2}}
{{reflist|2}}
[[Category:Medicine]]
[[Category:Medicine]]
[[Category:Oncology]]
[[Category:Oncology]]
[[Category:Up-To-Date]]​
[[Category:Up-To-Date]]
[[Category:Primary care]]
[[Category:Surgery]]
[[Category:Surgery]]

Latest revision as of 23:59, 29 July 2020

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Simrat Sarai, M.D. [2] Sahar Memar Montazerin, M.D.[3]

Overview

Retinoblastoma may be caused by mutation in both alleles of RB1 tumor suppressor gene or due to somatic amplification of the MYCN oncogene.

Causes

Heritable Retinoblastoma

Sporadic Heritable Retinoblastoma

References

  1. Du, W; Pogoriler, J (2006). "Retinoblastoma family genes". Oncogene. 25 (38): 5190–5200. doi:10.1038/sj.onc.1209651. ISSN 0950-9232.
  2. Singh, Arun (2007). Clinical ophthalmic oncology. Edinburgh: Elsevier Saunders. ISBN 978-1-4160-3167-3.
  3. Clark, Robin D.; Avishay, Stefanie G. (2015). "Retinoblastoma: Genetic Counseling and Testing": 77–88. doi:10.1007/978-3-662-43451-2_8.