Laryngeal cancer pathophysiology: Difference between revisions
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{{CMG}} {{AE}}{{Faizan}} | {{CMG}} {{AE}}{{Faizan}} | ||
==Overview== | ==Overview== | ||
Laryngeal cancer arises from [[squamous cell]]s, which are cells that are normally involved in protection of upper respiratory | [[Laryngeal cancer]] arises from [[squamous cell]]s, which are [[cells]] that are normally involved in protection of upper respiratory airway. [[Genes]] involved in the [[pathogenesis]] of [[laryngeal cancer]] include ''[[P16 (gene)|p16]]'', ''[[NOTCH1]]'', ''[[cyclin D1]]'', and ''[[TP53]]''. On gross [[pathology]], flattened plaques, mucosal [[ulceration]], and raised margins of the [[lesion]] are characteristic findings of [[laryngeal cancer]]. On microscopic [[histopathological]] analysis, [[spindle cell]]s, basaloid cells, and [[nuclear]] [[atypia]] are characteristic findings of [[laryngeal cancer]] | ||
==Pathophysiology== | ==Pathophysiology== | ||
Laryngeal cancer arises from [[squamous cell]]s, which are cells that are normally involved in protection of upper respiratory airways.<ref name="pmid8995133">{{cite journal |vauthors=Koufman JA, Burke AJ |title=The etiology and pathogenesis of laryngeal carcinoma |journal=Otolaryngol. Clin. North Am. |volume=30 |issue=1 |pages=1–19 |date=February 1997 |pmid=8995133 |doi= |url=}}</ref> | [[Laryngeal cancer]] arises from [[squamous cell]]s, which are [[cells]] that are normally involved in protection of upper respiratory airways.<ref name="pmid8995133">{{cite journal |vauthors=Koufman JA, Burke AJ |title=The etiology and pathogenesis of laryngeal carcinoma |journal=Otolaryngol. Clin. North Am. |volume=30 |issue=1 |pages=1–19 |date=February 1997 |pmid=8995133 |doi= |url=}}</ref> | ||
==Genetics== | ==Genetics== | ||
Development of laryngeal cancer is the result of multiple genetic mutations. These mutations lead to activation of oncogenes and inactivation of tumor suppression genes which ultimately result in deregulated cellular proliferation. Genes involved in the pathogenesis of laryngeal cancer include:<ref name="pmid26940775">{{cite journal |vauthors=de Miguel-Luken MJ, Chaves-Conde M, Carnero A |title=A genetic view of laryngeal cancer heterogeneity |journal=Cell Cycle |volume=15 |issue=9 |pages=1202–12 |date=May 2016 |pmid=26940775 |pmc=4894505 |doi=10.1080/15384101.2016.1156275 |url=}}</ref> | Development of [[laryngeal cancer]] is the result of multiple [[genetic mutations]]. These [[mutations]] lead to activation of [[oncogenes]] and inactivation of [[tumor]] suppression [[genes]] which ultimately result in deregulated [[cellular]] [[proliferation]]. Genes involved in the [[pathogenesis]] of [[laryngeal cancer]] include:<ref name="pmid26940775">{{cite journal |vauthors=de Miguel-Luken MJ, Chaves-Conde M, Carnero A |title=A genetic view of laryngeal cancer heterogeneity |journal=Cell Cycle |volume=15 |issue=9 |pages=1202–12 |date=May 2016 |pmid=26940775 |pmc=4894505 |doi=10.1080/15384101.2016.1156275 |url=}}</ref> | ||
*''[[P16 (gene)|p16]]'' | *''[[P16 (gene)|p16]]'' | ||
*''[[NOTCH1]]'' | *''[[NOTCH1]]'' | ||
| Line 16: | Line 16: | ||
==Gross Pathology== | ==Gross Pathology== | ||
On gross pathology, laryngeal cancer is characterized by: | On [[gross pathology]], [[laryngeal cancer]] is characterized by: | ||
*Flattened plaques | *Flattened [[plaques]] | ||
*Raised margins of the lesion | *Raised margins of the [[lesion]] | ||
*Mucosal ulceration | *[[Mucosal]] ulceration | ||
==Microscopic Pathology== | ==Microscopic Pathology== | ||
| Line 25: | Line 25: | ||
*[[Spindle cell]]s | *[[Spindle cell]]s | ||
*Basaloid cells | *Basaloid cells | ||
*Nuclear atypia | *[[Nuclear]] [[atypia]] | ||
*Abundant chromatin | *Abundant chromatin | ||
Squamous cell carcinoma is subdivided histopathologically | [[Squamous cell carcinoma]] is subdivided histopathologically:<ref name="pmid22180291">{{cite journal |vauthors=Hilly O, Raz R, Vaisbuch Y, Strenov Y, Segal K, Koren R, Shvero J |title=Thyroid gland involvement in advanced laryngeal cancer: association with clinical and pathologic characteristics |journal=Head Neck |volume=34 |issue=11 |pages=1586–90 |date=November 2012 |pmid=22180291 |doi=10.1002/hed.21972 |url=}}</ref><ref name="pmid21719209">{{cite journal |vauthors=Caldas-Magalhaes J, Kasperts N, Kooij N, van den Berg CA, Terhaard CH, Raaijmakers CP, Philippens ME |title=Validation of imaging with pathology in laryngeal cancer: accuracy of the registration methodology |journal=Int. J. Radiat. Oncol. Biol. Phys. |volume=82 |issue=2 |pages=e289–98 |date=February 2012 |pmid=21719209 |doi=10.1016/j.ijrobp.2011.05.004 |url=}}</ref> | ||
*Keratinizing type: | *Keratinizing type: | ||
**Keratinization & intercellular bridges through-out most of the malignant lesion | **[[Keratinization]] & intercellular bridges through-out most of the [[malignant]] [[lesion]] | ||
*Undifferentiated type: | *[[Undifferentiated]] type: | ||
**Non-distinct borders/syncytial pattern | **Non-distinct borders/syncytial pattern | ||
**[[Nucleoli]] | **[[Nucleoli]] | ||
*Non keratinizing type: | *Non keratinizing type: | ||
**Well-defined cell borders | **Well-defined [[cell]] borders | ||
**[[Eosinophilia]] | **[[Eosinophilia]] | ||
**Extra large nuclei/bizarre nuclei | **Extra large [[nuclei]]/bizarre [[nuclei]] | ||
**[[Inflammation]] (lymphocytes, plasma cells) | **[[Inflammation]] ([[lymphocytes]], [[plasma cells]]) | ||
**Long rete ridges | **Long [[rete]] ridges | ||
**Numerous beeds/blobs of [[epithelial cells]] that seem unlikely to be rete ridges | **Numerous beeds/blobs of [[epithelial cells]] that seem unlikely to be [[rete]] ridges | ||
===Squamous Cell Carcinoma Subtypes=== | ===Squamous Cell Carcinoma Subtypes=== | ||
There are several histological subtypes of squamous cell carcinoma of larynx which include: | There are several [[histological]] subtypes of [[squamous cell carcinoma]] of [[larynx]] which include: | ||
*Basaloid | *Basaloid | ||
*Warty (condylomatous) | *Warty (condylomatous) | ||
*Verrucous | *[[Verrucous carcinoma|Verrucous]] | ||
*Papillary | *[[Papillary]] | ||
*Lymphoepithelial | *Lymphoepithelial | ||
*[[Spindle cell]] | *[[Spindle cell]] | ||
==Immunohistochemistry== | ==Immunohistochemistry== | ||
There are several immunohistochemistry markers of laryngeal carcinoma which include: | There are several [[immunohistochemistry]] markers of laryngeal carcinoma which include: | ||
*p63 positive | *p63 positive | ||
*EBER negative | *EBER negative | ||
*p16 negative | *[[p16]] negative | ||
*BCL2 positive/negative | *[[BCL2L2|BCL2]] positive/negative | ||
==References== | ==References== | ||
Revision as of 20:21, 11 January 2019
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Faizan Sheraz, M.D. [2]
Overview
Laryngeal cancer arises from squamous cells, which are cells that are normally involved in protection of upper respiratory airway. Genes involved in the pathogenesis of laryngeal cancer include p16, NOTCH1, cyclin D1, and TP53. On gross pathology, flattened plaques, mucosal ulceration, and raised margins of the lesion are characteristic findings of laryngeal cancer. On microscopic histopathological analysis, spindle cells, basaloid cells, and nuclear atypia are characteristic findings of laryngeal cancer
Pathophysiology
Laryngeal cancer arises from squamous cells, which are cells that are normally involved in protection of upper respiratory airways.[1]
Genetics
Development of laryngeal cancer is the result of multiple genetic mutations. These mutations lead to activation of oncogenes and inactivation of tumor suppression genes which ultimately result in deregulated cellular proliferation. Genes involved in the pathogenesis of laryngeal cancer include:[2]
Gross Pathology
On gross pathology, laryngeal cancer is characterized by:
Microscopic Pathology
On microscopic histopathological analysis, laryngeal carcinoma is characterized by:[3][4][5][6]
- Spindle cells
- Basaloid cells
- Nuclear atypia
- Abundant chromatin
Squamous cell carcinoma is subdivided histopathologically:[3][4]
- Keratinizing type:
- Keratinization & intercellular bridges through-out most of the malignant lesion
- Undifferentiated type:
- Non-distinct borders/syncytial pattern
- Nucleoli
- Non keratinizing type:
- Well-defined cell borders
- Eosinophilia
- Extra large nuclei/bizarre nuclei
- Inflammation (lymphocytes, plasma cells)
- Long rete ridges
- Numerous beeds/blobs of epithelial cells that seem unlikely to be rete ridges
Squamous Cell Carcinoma Subtypes
There are several histological subtypes of squamous cell carcinoma of larynx which include:
- Basaloid
- Warty (condylomatous)
- Verrucous
- Papillary
- Lymphoepithelial
- Spindle cell
Immunohistochemistry
There are several immunohistochemistry markers of laryngeal carcinoma which include:
References
- ↑ Koufman JA, Burke AJ (February 1997). "The etiology and pathogenesis of laryngeal carcinoma". Otolaryngol. Clin. North Am. 30 (1): 1–19. PMID 8995133.
- ↑ de Miguel-Luken MJ, Chaves-Conde M, Carnero A (May 2016). "A genetic view of laryngeal cancer heterogeneity". Cell Cycle. 15 (9): 1202–12. doi:10.1080/15384101.2016.1156275. PMC 4894505. PMID 26940775.
- ↑ 3.0 3.1 Hilly O, Raz R, Vaisbuch Y, Strenov Y, Segal K, Koren R, Shvero J (November 2012). "Thyroid gland involvement in advanced laryngeal cancer: association with clinical and pathologic characteristics". Head Neck. 34 (11): 1586–90. doi:10.1002/hed.21972. PMID 22180291.
- ↑ 4.0 4.1 Caldas-Magalhaes J, Kasperts N, Kooij N, van den Berg CA, Terhaard CH, Raaijmakers CP, Philippens ME (February 2012). "Validation of imaging with pathology in laryngeal cancer: accuracy of the registration methodology". Int. J. Radiat. Oncol. Biol. Phys. 82 (2): e289–98. doi:10.1016/j.ijrobp.2011.05.004. PMID 21719209.
- ↑ MUSTAKALLIO S (August 1946). "Relation of microscopic structure of laryngeal cancer to radiocurability". Acta radiol. 27 (5): 473–80. PMID 20286025.
- ↑ Franz B, Wetzel M (July 1980). "[Cytology of the early invasive laryngeal cancer (author's transl)]". Laryngol Rhinol Otol (Stuttg) (in German). 59 (7): 401–5. PMID 7453440.