Melanoma natural history, complications and prognosis: Difference between revisions
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==Overview== | |||
==Natural history== | ==Natural history== | ||
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==Complications== | ==Complications== | ||
==Prognosis== | ==Prognosis== | ||
Features that affect [[prognosis]] are [[tumor]] thickness in millimeters ([[Breslow's depth]]), depth related to skin structures (Clark level), type of melanoma, presence of ulceration, presence of lymphatic/perineural invasion, presence of tumor infiltrating [[lymphocyte]]s (if present, prognosis is better), location of lesion, presence of satellite lesions, and presence of regional or distant [[metastasis]].<ref>{{cite journal | author = Homsi J, Kashani-Sabet M, Messina J, Daud A | title = Cutaneous melanoma: prognostic factors. | journal = Cancer Control | volume = 12 | issue = 4 | pages = 223-9 | year = 2005 | id = PMID 16258493}}''[https://www.moffitt.usf.edu/pubs/ccj/v12n4/pdf/223.pdf Full text (PDF)]''</ref> | Features that affect [[prognosis]] are [[tumor]] thickness in millimeters ([[Breslow's depth]]), depth related to skin structures (Clark level), type of melanoma, presence of ulceration, presence of lymphatic/perineural invasion, presence of tumor infiltrating [[lymphocyte]]s (if present, prognosis is better), location of lesion, presence of satellite lesions, and presence of regional or distant [[metastasis]].<ref>{{cite journal | author = Homsi J, Kashani-Sabet M, Messina J, Daud A | title = Cutaneous melanoma: prognostic factors. | journal = Cancer Control | volume = 12 | issue = 4 | pages = 223-9 | year = 2005 | id = PMID 16258493}}''[https://www.moffitt.usf.edu/pubs/ccj/v12n4/pdf/223.pdf Full text (PDF)]''</ref> | ||
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There is not enough definitive evidence to adequately stage, and thus give a prognosis for ocular melanoma and melanoma of soft parts, or mucosal melanoma (e.g. rectal melanoma), although these tend to metastasize more easily. Even though regression may increase survival, when a melanoma has regressed, it is impossible to know its original size and thus the original tumor is often worse than a [[Pathology|pathology report]] might indicate. | There is not enough definitive evidence to adequately stage, and thus give a prognosis for ocular melanoma and melanoma of soft parts, or mucosal melanoma (e.g. rectal melanoma), although these tend to metastasize more easily. Even though regression may increase survival, when a melanoma has regressed, it is impossible to know its original size and thus the original tumor is often worse than a [[Pathology|pathology report]] might indicate. | ||
{{see also|Breslow's depth}} | |||
[[Image:Melanoma 2.jpg|thumb|center|220px|Black, irregularly shaped, uniformly brown pigmented nevus on a 19-year-old man's right cheek. The Breslow index measured 2.88 mm, and a thorough medical evaluation revealed no evidence of metastases. The scar was reexcised with a 2-cm margin, and the skin was repaired with a graft.]] | |||
==References== | ==References== | ||
{{Reflist|2}} | {{Reflist|2}} | ||
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Revision as of 20:03, 21 August 2012
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
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Overview
Natural history
Please help WikiDoc by adding more content here. It's easy! Click here to learn about editing.
Complications
Prognosis
Features that affect prognosis are tumor thickness in millimeters (Breslow's depth), depth related to skin structures (Clark level), type of melanoma, presence of ulceration, presence of lymphatic/perineural invasion, presence of tumor infiltrating lymphocytes (if present, prognosis is better), location of lesion, presence of satellite lesions, and presence of regional or distant metastasis.[1]
Certain types of melanoma have worse prognoses but this is explained by their thickness. Interestingly, less invasive melanomas even with lymph node metastases carry a better prognosis than deep melanomas without regional metastasis at time of staging. Local recurrences tend to behave similarly to a primary unless they are at the site of a wide local excision (as opposed to a staged excision or punch/shave excision) since these recurrences tend to indicate lymphatic invasion.
When melanomas have spread to the lymph nodes, one of the most important factors is the number of nodes with malignancy. Extent of malignancy within a node is also important; micrometastases in which malignancy is only microscopic have a more favorable prognosis than macrometastases. In some cases micrometastases may only be detected by special staining, and if malignancy is only detectable by a rarely-employed test known as polymerase chain reaction (PCR), the prognosis is better. Macrometastases in which malignancy is clinically apparent (in some cases cancer completely replaces a node) have a far worse prognosis, and if nodes are matted or if there is extracapsular extension, the prognosis is still worse.
When there is distant metastasis, the cancer is generally considered incurable. The five year survival rate is less than 10%.[2] The median survival is 6 to 12 months. Treatment is palliative, focusing on life-extension and quality of life. In some cases, patients may live many months or even years with metastatic melanoma (depending on the aggressiveness of the treatment). Metastases to skin and lungs have a better prognosis. Metastases to brain, bone and liver are associated with a worse prognosis.
There is not enough definitive evidence to adequately stage, and thus give a prognosis for ocular melanoma and melanoma of soft parts, or mucosal melanoma (e.g. rectal melanoma), although these tend to metastasize more easily. Even though regression may increase survival, when a melanoma has regressed, it is impossible to know its original size and thus the original tumor is often worse than a pathology report might indicate.
References
- ↑ Homsi J, Kashani-Sabet M, Messina J, Daud A (2005). "Cutaneous melanoma: prognostic factors". Cancer Control. 12 (4): 223–9. PMID 16258493.Full text (PDF)
- ↑ Balch C, Buzaid A, Soong S, Atkins M, Cascinelli N, Coit D, Fleming I, Gershenwald J, Houghton A, Kirkwood J, McMasters K, Mihm M, Morton D, Reintgen D, Ross M, Sober A, Thompson J, Thompson J (2001). "Final version of the American Joint Committee on Cancer staging system for cutaneous melanoma". J Clin Oncol. 19 (16): 3635–48. PMID 11504745.Full text