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[[Image:Tumour-infiltrating lymphocytes - 2 -- very high mag.jpg|thumb|right|250px||[[Micrograph]] showing [[tumour infiltrating lymphocytes]], a finding seen in Lynch syndrome.]]
'''Lynch syndrome''', also '''hereditary non-polyposis colorectal cancer syndrome'''  (abbreviated '''HNPCC'''), is a constellation of clinical findings caused by a mutation in a mismatch repair gene, of which there are several.<ref name=OMIM120435>{{OMIM|120435}}</ref>
'''Lynch syndrome''', also '''hereditary non-polyposis colorectal cancer syndrome'''  (abbreviated '''HNPCC'''), is a constellation of clinical findings caused by a mutation in a mismatch repair gene, of which there are several.<ref name=OMIM120435>{{OMIM|120435}}</ref>


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The term ''Lynch syndrome'' is preferred as individuals with this syndrome often present with non-colorectal cancers.
The term ''Lynch syndrome'' is preferred as individuals with this syndrome often present with non-colorectal cancers.


==Clinical==
==General==
*Definitive diagnosis is by molecular testing (sequencing).
*[[Immunohistochemical stains]] have a very strong concordance with molecular testing - see ''[[microsatellite instability]]''.
 
===Clinical classification===
Divided into:<ref name=OMIM120435>{{OMIM|120435}}</ref>
Divided into:<ref name=OMIM120435>{{OMIM|120435}}</ref>
*''Lynch syndrome I'' - colon cancer associated.
*''Lynch syndrome I'' - colon cancer associated.
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** More common in females (~50%) vs. males (~25%).<ref name=pmid19215248>{{Cite journal  | last1 = Barrow | first1 = E. | last2 = Robinson | first2 = L. | last3 = Alduaij | first3 = W. | last4 = Shenton | first4 = A. | last5 = Clancy | first5 = T. | last6 = Lalloo | first6 = F. | last7 = Hill | first7 = J. | last8 = Evans | first8 = DG. | title = Cumulative lifetime incidence of extracolonic cancers in Lynch syndrome: a report of 121 families with proven mutations. | journal = Clin Genet | volume = 75 | issue = 2 | pages = 141-9 | month = Feb | year = 2009 | doi = 10.1111/j.1399-0004.2008.01125.x | PMID = 19215248 }}</ref>
** More common in females (~50%) vs. males (~25%).<ref name=pmid19215248>{{Cite journal  | last1 = Barrow | first1 = E. | last2 = Robinson | first2 = L. | last3 = Alduaij | first3 = W. | last4 = Shenton | first4 = A. | last5 = Clancy | first5 = T. | last6 = Lalloo | first6 = F. | last7 = Hill | first7 = J. | last8 = Evans | first8 = DG. | title = Cumulative lifetime incidence of extracolonic cancers in Lynch syndrome: a report of 121 families with proven mutations. | journal = Clin Genet | volume = 75 | issue = 2 | pages = 141-9 | month = Feb | year = 2009 | doi = 10.1111/j.1399-0004.2008.01125.x | PMID = 19215248 }}</ref>


==Associations==
===Genes===
*MSH2 gene<ref name=OMIM120435>{{OMIM|120435}}</ref> - most common.
*MLH1 gene<ref name=OMIM120436>{{OMIM|120436}}</ref> - second most common.
*PMS2 gene.<ref name=OMIM600259>{{OMIM|600259}}</ref>
*MSH6 gene<ref name=OMIM600678>{{OMIM|600678}}</ref> - tend to present in older individuals compared to individuals with MLH1 or MSH2 mutations.<ref name=pmid24056992>{{Cite journal  | last1 = Stewart | first1 = A. | title = Genetic testing strategies in newly diagnosed endometrial cancer patients aimed at reducing morbidity or mortality from lynch syndrome in the index case or her relatives. | journal = PLoS Curr | volume = 5 | issue =  | pages =  | month =  | year = 2013 | doi = 10.1371/currents.eogt.b59a6e84f27c536e50db4e46aa26309c | PMID = 24056992 }}</ref>
*Others.
 
===Associations===
*[[Colorectal carcinoma]].
*[[Colorectal carcinoma]].
*Non-endometrioid [[endometrial carcinoma]],<ref name=pmid20396392>{{cite journal |author=Okuda T, Sekizawa A, Purwosunu Y, ''et al.'' |title=Genetics of endometrial cancers |journal=Obstet Gynecol Int |volume=2010 |issue= |pages=984013 |year=2010 |pmid=20396392 |pmc=2852605 |doi=10.1155/2010/984013 |url=}}</ref> e.g. [[endometrial clear cell carcinoma]].<ref name=pmid19638537>{{Cite journal  | last1 = Garg | first1 = K. | last2 = Soslow | first2 = RA. | title = Lynch syndrome (hereditary non-polyposis colorectal cancer) and endometrial carcinoma. | journal = J Clin Pathol | volume = 62 | issue = 8 | pages = 679-84 | month = Aug | year = 2009 | doi = 10.1136/jcp.2009.064949 | PMID = 19638537 | url = http://jcp.bmj.com/content/62/8/679.long }}</ref>
*[[Endometrial carcinoma]].
**Morphologic features are not [[sensitivity|sensitive]] - IHC required.
**Non-endometrioid [[endometrial carcinoma]],<ref name=pmid20396392>{{cite journal |author=Okuda T, Sekizawa A, Purwosunu Y, ''et al.'' |title=Genetics of endometrial cancers |journal=Obstet Gynecol Int |volume=2010 |issue= |pages=984013 |year=2010 |pmid=20396392 |pmc=2852605 |doi=10.1155/2010/984013 |url=}}</ref> e.g. [[endometrial clear cell carcinoma]].<ref name=pmid19638537>{{Cite journal  | last1 = Garg | first1 = K. | last2 = Soslow | first2 = RA. | title = Lynch syndrome (hereditary non-polyposis colorectal cancer) and endometrial carcinoma. | journal = J Clin Pathol | volume = 62 | issue = 8 | pages = 679-84 | month = Aug | year = 2009 | doi = 10.1136/jcp.2009.064949 | PMID = 19638537 | url = http://jcp.bmj.com/content/62/8/679.long }}</ref>
**[[Endometrioid endometrial carcinoma]].<ref name=pmid11873308>{{Cite journal  | last1 = Lax | first1 = SF. | title = [Dualistic model of molecular pathogenesis in endometrial carcinoma]. | journal = Zentralbl Gynakol | volume = 124 | issue = 1 | pages = 10-6 | month = Jan | year = 2002 | doi = 10.1055/s-2002-20303 | PMID = 11873308 }}</ref>
**Suggestive features: lower uterine segment, [[tumour infiltrating lymphocytes]].<ref name=pmid9638537>{{Cite journal  | last1 = Garg | first1 = K. | last2 = Soslow | first2 = RA. | title = Lynch syndrome (hereditary non-polyposis colorectal cancer) and endometrial carcinoma. | journal = J Clin Pathol | volume = 62 | issue = 8 | pages = 679-84 | month = Aug | year = 2009 | doi = 10.1136/jcp.2009.064949 | PMID = 19638537 }}</ref>
**Suggestive features: lower uterine segment, [[tumour infiltrating lymphocytes]].<ref name=pmid9638537>{{Cite journal  | last1 = Garg | first1 = K. | last2 = Soslow | first2 = RA. | title = Lynch syndrome (hereditary non-polyposis colorectal cancer) and endometrial carcinoma. | journal = J Clin Pathol | volume = 62 | issue = 8 | pages = 679-84 | month = Aug | year = 2009 | doi = 10.1136/jcp.2009.064949 | PMID = 19638537 }}</ref>
*[[Stomach carcinoma]],<ref name=OMIM120435>{{OMIM|120435}}</ref> intestinal-type.<ref name=pmid3581033>{{Cite journal  | last1 = Cristofaro | first1 = G. | last2 = Lynch | first2 = HT. | last3 = Caruso | first3 = ML. | last4 = Attolini | first4 = A. | last5 = DiMatteo | first5 = G. | last6 = Giorgio | first6 = P. | last7 = Senatore | first7 = S. | last8 = Argentieri | first8 = A. | last9 = Sbano | first9 = E. | title = New phenotypic aspects in a family with Lynch syndrome II. | journal = Cancer | volume = 60 | issue = 1 | pages = 51-8 | month = Jul | year = 1987 | doi =  | PMID = 3581033 }}</ref>
*[[Stomach carcinoma]],<ref name=OMIM120435>{{OMIM|120435}}</ref> intestinal-type.<ref name=pmid3581033>{{Cite journal  | last1 = Cristofaro | first1 = G. | last2 = Lynch | first2 = HT. | last3 = Caruso | first3 = ML. | last4 = Attolini | first4 = A. | last5 = DiMatteo | first5 = G. | last6 = Giorgio | first6 = P. | last7 = Senatore | first7 = S. | last8 = Argentieri | first8 = A. | last9 = Sbano | first9 = E. | title = New phenotypic aspects in a family with Lynch syndrome II. | journal = Cancer | volume = 60 | issue = 1 | pages = 51-8 | month = Jul | year = 1987 | doi =  | PMID = 3581033 }}</ref>
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**Papillary lesions > flat lesions.<ref name=pmid12673555>{{Cite journal  | last1 = Hartmann | first1 = A. | last2 = Dietmaier | first2 = W. | last3 = Hofstädter | first3 = F. | last4 = Burgart | first4 = LJ. | last5 = Cheville | first5 = JC. | last6 = Blaszyk | first6 = H. | title = Urothelial carcinoma of the upper urinary tract: inverted growth pattern is predictive of microsatellite instability. | journal = Hum Pathol | volume = 34 | issue = 3 | pages = 222-7 | month = Mar | year = 2003 | doi = 10.1053/hupa.2003.22 | PMID = 12673555 }}</ref>
**Papillary lesions > flat lesions.<ref name=pmid12673555>{{Cite journal  | last1 = Hartmann | first1 = A. | last2 = Dietmaier | first2 = W. | last3 = Hofstädter | first3 = F. | last4 = Burgart | first4 = LJ. | last5 = Cheville | first5 = JC. | last6 = Blaszyk | first6 = H. | title = Urothelial carcinoma of the upper urinary tract: inverted growth pattern is predictive of microsatellite instability. | journal = Hum Pathol | volume = 34 | issue = 3 | pages = 222-7 | month = Mar | year = 2003 | doi = 10.1053/hupa.2003.22 | PMID = 12673555 }}</ref>
**Extensive inverted growth pattern suggestive of MSI.<ref name=pmid12673555/>
**Extensive inverted growth pattern suggestive of MSI.<ref name=pmid12673555/>
**MSH2 mutations have an increased risk of urothelial carcinoma relative to MLH1 and MSH6 mutations.<ref name=pmid20591884>{{Cite journal  | last1 = van der Post | first1 = RS. | last2 = Kiemeney | first2 = LA. | last3 = Ligtenberg | first3 = MJ. | last4 = Witjes | first4 = JA. | last5 = Hulsbergen-van de Kaa | first5 = CA. | last6 = Bodmer | first6 = D. | last7 = Schaap | first7 = L. | last8 = Kets | first8 = CM. | last9 = van Krieken | first9 = JH. | title = Risk of urothelial bladder cancer in Lynch syndrome is increased, in particular among MSH2 mutation carriers. | journal = J Med Genet | volume = 47 | issue = 7 | pages = 464-70 | month = Jul | year = 2010 | doi = 10.1136/jmg.2010.076992 | PMID = 20591884 }}</ref>


Lame mnemonic ''GP CUBE'':  
Lame mnemonic ''GP CUBE'':  
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*All the cancers are below the diaphragm.
*All the cancers are below the diaphragm.


==Genes==
===Special types===
*MSH2 gene<ref name=OMIM120435>{{OMIM|120435}}</ref> - most common.
====Muir-Torre syndrome====
*MLH1 gene<ref name=OMIM120436>{{OMIM|120436}}</ref> - second most common.
*PMS2 gene.<ref name=OMIM600259>{{OMIM|600259}}</ref>
*MSH6 gene.<ref name=OMIM600678>{{OMIM|600678}}</ref>
*Others.
 
==Special types==
===Muir-Torre syndrome===
*Abbreviated ''MTS''.
*Abbreviated ''MTS''.


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Molecular pathology:
Molecular pathology:
*MTS is caused by mutations in MSH2 or MLH1.<ref name=omim158320>{{OMIM|158320}}</ref>
*MTS is caused by mutations in MSH2 or MLH1.<ref name=omim158320>{{OMIM|158320}}</ref>
==IHC==
:''See [[microsatellite instability]]''.


==See also==
==See also==

Latest revision as of 20:49, 13 March 2016

Micrograph showing tumour infiltrating lymphocytes, a finding seen in Lynch syndrome.

Lynch syndrome, also hereditary non-polyposis colorectal cancer syndrome (abbreviated HNPCC), is a constellation of clinical findings caused by a mutation in a mismatch repair gene, of which there are several.[1]

As the name suggests, HNPCC is a form of inherited colorectal cancer that is not characterized by abundant intestinal polyps (non-polyposis), as in adenomatous polyposis coli.

The term Lynch syndrome is preferred as individuals with this syndrome often present with non-colorectal cancers.

General

Clinical classification

Divided into:[1]

  • Lynch syndrome I - colon cancer associated.
  • Lynch syndrome II - non-colon cancer associated.
    • More common in females (~50%) vs. males (~25%).[2]

Genes

  • MSH2 gene[1] - most common.
  • MLH1 gene[3] - second most common.
  • PMS2 gene.[4]
  • MSH6 gene[5] - tend to present in older individuals compared to individuals with MLH1 or MSH2 mutations.[6]
  • Others.

Associations

Lame mnemonic GP CUBE:

  • Gastric.
  • Pancreas.
  • CRC.
  • UCC.
  • Biliary.
  • Endometrial.

Note:

  • All the cancers are below the diaphragm.

Special types

Muir-Torre syndrome

  • Abbreviated MTS.

Molecular pathology:

  • MTS is caused by mutations in MSH2 or MLH1.[18]

IHC

See microsatellite instability.

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Online 'Mendelian Inheritance in Man' (OMIM) 120435
  2. ↑ 2.0 2.1 Barrow, E.; Robinson, L.; Alduaij, W.; Shenton, A.; Clancy, T.; Lalloo, F.; Hill, J.; Evans, DG. (Feb 2009). "Cumulative lifetime incidence of extracolonic cancers in Lynch syndrome: a report of 121 families with proven mutations.". Clin Genet 75 (2): 141-9. doi:10.1111/j.1399-0004.2008.01125.x. PMID 19215248.
  3. ↑ Online 'Mendelian Inheritance in Man' (OMIM) 120436
  4. ↑ Online 'Mendelian Inheritance in Man' (OMIM) 600259
  5. ↑ Online 'Mendelian Inheritance in Man' (OMIM) 600678
  6. ↑ Stewart, A. (2013). "Genetic testing strategies in newly diagnosed endometrial cancer patients aimed at reducing morbidity or mortality from lynch syndrome in the index case or her relatives.". PLoS Curr 5. doi:10.1371/currents.eogt.b59a6e84f27c536e50db4e46aa26309c. PMID 24056992.
  7. ↑ Okuda T, Sekizawa A, Purwosunu Y, et al. (2010). "Genetics of endometrial cancers". Obstet Gynecol Int 2010: 984013. doi:10.1155/2010/984013. PMC 2852605. PMID 20396392. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2852605/.
  8. ↑ Garg, K.; Soslow, RA. (Aug 2009). "Lynch syndrome (hereditary non-polyposis colorectal cancer) and endometrial carcinoma.". J Clin Pathol 62 (8): 679-84. doi:10.1136/jcp.2009.064949. PMID 19638537. http://jcp.bmj.com/content/62/8/679.long.
  9. ↑ Lax, SF. (Jan 2002). "[Dualistic model of molecular pathogenesis in endometrial carcinoma].". Zentralbl Gynakol 124 (1): 10-6. doi:10.1055/s-2002-20303. PMID 11873308.
  10. ↑ Garg, K.; Soslow, RA. (Aug 2009). "Lynch syndrome (hereditary non-polyposis colorectal cancer) and endometrial carcinoma.". J Clin Pathol 62 (8): 679-84. doi:10.1136/jcp.2009.064949. PMID 19638537.
  11. ↑ Cristofaro, G.; Lynch, HT.; Caruso, ML.; Attolini, A.; DiMatteo, G.; Giorgio, P.; Senatore, S.; Argentieri, A. et al. (Jul 1987). "New phenotypic aspects in a family with Lynch syndrome II.". Cancer 60 (1): 51-8. PMID 3581033.
  12. ↑ Renkonen-Sinisalo, L.; Sipponen, P.; Aarnio, M.; Julkunen, R.; Aaltonen, LA.; Sarna, S.; Järvinen, HJ.; Mecklin, JP. (May 2002). "No support for endoscopic surveillance for gastric cancer in hereditary non-polyposis colorectal cancer.". Scand J Gastroenterol 37 (5): 574-7. PMID 12059060.
  13. ↑ Crockett, DG.; Wagner, DG.; Holmäng, S.; Johansson, SL.; Lynch, HT. (May 2011). "Upper urinary tract carcinoma in Lynch syndrome cases.". J Urol 185 (5): 1627-30. doi:10.1016/j.juro.2010.12.102. PMID 21419447.
  14. ↑ 14.0 14.1 Hartmann, A.; Dietmaier, W.; Hofstädter, F.; Burgart, LJ.; Cheville, JC.; Blaszyk, H. (Mar 2003). "Urothelial carcinoma of the upper urinary tract: inverted growth pattern is predictive of microsatellite instability.". Hum Pathol 34 (3): 222-7. doi:10.1053/hupa.2003.22. PMID 12673555.
  15. ↑ van der Post, RS.; Kiemeney, LA.; Ligtenberg, MJ.; Witjes, JA.; Hulsbergen-van de Kaa, CA.; Bodmer, D.; Schaap, L.; Kets, CM. et al. (Jul 2010). "Risk of urothelial bladder cancer in Lynch syndrome is increased, in particular among MSH2 mutation carriers.". J Med Genet 47 (7): 464-70. doi:10.1136/jmg.2010.076992. PMID 20591884.
  16. ↑ Kumar, Vinay; Abbas, Abul K.; Fausto, Nelson; Aster, Jon (2009). Robbins and Cotran pathologic basis of disease (8th ed.). Elsevier Saunders. pp. 1177. ISBN 978-1416031215.
  17. ↑ 17.0 17.1 Cohen, PR.; Kohn, SR.; Kurzrock, R. (May 1991). "Association of sebaceous gland tumors and internal malignancy: the Muir-Torre syndrome.". Am J Med 90 (5): 606-13. PMID 2029018.
  18. ↑ Online 'Mendelian Inheritance in Man' (OMIM) 158320
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