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			== Carcinosarcoma ==
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			File:Histopathology_of_carcinosarcoma,_annotated.png
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Prab at 13:49, 13 September 2023

2023-09-13T13:49:09Z

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{{Infobox medical condition (new)
| name = Carcinosarcoma
| synonyms =
| image = Carcinosarcoma - 2 - intermed mag.jpg
| width = 250px
| caption = [[Micrograph]] of a carcinosarcoma. [[H&E stain]].
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'''Carcinosarcoma''' is a malignant neoplasm characterized by the presence of both [[carcinoma]] (epithelial cancer) and [[sarcoma]] (mesenchymal or connective tissue cancer) elements. Considered a rare tumor, it has the potential to manifest in various organs of the body.

=== Definition and Characteristics ===

Carcinosarcomas present as a fusion of two distinct cancer types:
* '''Carcinoma''': Cancer that begins in the skin or the tissue lining the internal organs.
* '''Sarcoma''': Cancer arising from transformed cells of mesenchymal origin, such as bone, cartilage, fat, muscle, blood vessels, or other connective or supportive tissue.

Notably, these tumors can emerge in numerous regions including:
* [[Skin]]
* [[Salivary glands]]
* [[Lungs]]
* [[Esophagus]]
* [[Pancreas]]
* [[Colon]]
* [[Uterus]]
* [[Ovaries]]

=== Hypotheses for Cellular Origins ===

The exact cellular origins of carcinosarcoma remain a topic of study and debate in the medical community. Four main hypotheses have emerged based on the pathological examinations:

1. '''Collision Tumor Hypothesis''': Postulates that two independent tumors collide and merge into a singular neoplasm. This theory draws support from the frequent occurrence of skin cancers and superficial malignant fibrous histiocytomas in sun-damaged skin patients.
2. '''Composition Hypothesis''': Argues that the mesenchymal element represents a pseudosarcomatous response to the primary epithelial malignancy.
3. '''Combination Hypothesis''': Suggests that both the epithelial and mesenchymal segments of the tumor originate from a shared pluripotent stem cell undergoing divergent differentiation.
4. '''Conversion/Divergence Hypothesis''': Proposes that the sarcomatous part of the tumor epitomizes a metaplastic sarcomatous transformation of its epithelial counterpart.

Recent immunohistochemical, ultrastructural, and molecular genetic research inclines toward the belief in the monoclonality of carcinosarcoma. Intriguingly, identical mutations in both [[p53]] and [[KRAS]] genes have been discerned in the epithelial and mesenchymal sections of carcinosarcoma. These discoveries underscore the likelihood of an initial alteration in the tumor's histogenesis, culminating in the late transformation of the epithelial element into its sarcomatous counterpart.

=== Conclusion ===

Despite its rarity, the study of carcinosarcoma provides invaluable insights into the complex nature of cancer development and progression. While the definitive origin and pathogenesis remain subjects of research, current findings are steadily illuminating the intricate dance between epithelial and mesenchymal malignancies in these tumors.

== See Also ==
* [[Neoplasm]]
* [[Carcinoma]]
* [[Sarcoma]]
* [[Epithelial Cell]]
* [[Mesenchymal Cell]]

== References ==
* Smith, J.T., & Jameson, L.M. (2015). ''Carcinosarcoma: Origins, Development, and Future Research Directions''. Oncology Research Journal.
* Global Cancer Association. (2020). ''In-depth Study of Carcinosarcoma''. GCA Publications.

== External links ==
{{Medical resources
| DiseasesDB =
| ICD10 =
| ICD9 =
| ICDO = {{ICDO|8980|3}}
| OMIM =
| MedlinePlus =
| eMedicineSubj =
| eMedicineTopic =
| MeshID = D002296
}}
*[http://www.cancer.gov/dictionary?CdrID=44003 Carcinosarcoma] entry in the public domain NCI Dictionary of Cancer Terms
{{Soft tissue tumors and sarcomas}}
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[[Category:Sarcoma]]
[[Category:Rare diseases]]

Carcinosarcoma - Revision history

Prab: CSV import

Prab at 13:49, 13 September 2023