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Merkel cell carcinoma is an uncommon , neuroendocrineand strong-growing skin tumor . It award as a nodule or an indurated plaque on sun - exposed areas of the skin in elderly patient . Merkel electric cell carcinoma is associate with high rates of recurrence and metastasis . The 5 - yr survival of the fittest for local disease and distant disease is 51 % and 14 % , severally . According to the Surveillance , Epidemiology , and End event ( SEER ) data , the universal relative incidence for Merkel cell carcinoma is around 0.10 - 1.6 per 100,000 individuals per twelvemonth . The disease is more vulgar in elderly in their 7th or eighth X of life . It is also more rough-cut in whites than any other races , and 25 meter more uncouth in Caucasians . It also affects more man than woman and more commonly seen in Dominicus - uncover field , peculiarly the head and neck region.(1 )
How Does Merkel Cell Carcinoma Affect The Body?
Merkel cadre carcinomas upshot on the body is not specific and is widely varied . It is often a chop-chop growing tumor mass ingest a benighted grim - red appearance with the shiny and non - ulcerated control surface . some 80 % of the tumour are localized sun - expose orbit such as face , neck opening , and extremities , whereas some are seen in the trunk part . Due to its wide-ranging clinical presentation , it can easily be confused with other diseases such as cutaneous metastasis , lymphoma , adnexal tumors , basal prison cell carcinoma , malignant melanoma , and others . Therefore , the diagnosis is always confirmed after histopathological examination . The tumor is strong and non - cohesive tumour within the dermis.(2 )
The tumor presents as papules , plaques , and vesicle - like structure , pruritic neoplasm on the low-down extremities , subcutaneous bulk , pedunculated wound , and telangiectatic brass . While the non - ulcerous tumor is more common , it can also present as an ulcerated lesion . About 1/3 rd of the patient present with nodal or metastatic disease at the time of diagnosis . It can also submit as a mucosal wound , while in some patients no primary lesion has been report . The recurrence pace of Merkel cell carcinoma is quite high . The tumor is associated with a greater risk of nodal disease and about 24 - 42 % of patient even with small tumors have clinically occult nodal disease . The distant metastases can occur to any part of the soundbox let in lungs , osseous tissue or other harmonium and other arena of the skin.(1 )
Since Merkel cell carcinoma is colligate with higher grade of misdiagnosis , the acronym AEIOU for symptomless ( painless ) , expanding ( rapidly ) , immunosuppression , old age ( > 50 years ) and ultraviolet light radiation syndrome exposure can be used . The comportment of three or more of these machine characteristic should leaven the suspicion for Merkel cell carcinoma.(3 )
What Triggers Merkel Cell Carcinoma?
The most common initiation for Merkel mobile phone carcinoma is chronic exposure to ultraviolet light radiation and sunlight along with Merkel electric cell polyomavirus , ripe age , and immunosuppression . It is more common in the white population than non - white , 94.9 % versus 4.1 % and the average age of diagnosis is around 73.6 ( for men ) to 76.2 ( for women ) . Merkel cell carcinoma is uncommon in younger age , when present it is mostly related to immunosuppression , such as organ transplant , andHIV infection . The tumor is also commonly consociate with other tumor , such asmelanoma , non - Hodgkin ’s lymphoma , multiple myeloma , and chronic lymphocytic leukemia.(3 )
The Merkel cellular telephone polyomavirus infection is linked to 80 % of sheath of Merkel cell carcinoma . The patient role confirming for Merkel electric cell polyomavirus have a well prognosis than polyomavirus disconfirming tumors . It is hypothesized that Merkel cellphone carcinoma come either through inadvertent infection of Merkel cells near infected fibroblasts or after Merkel cell polyomavirus transmission fibroblast undergo transmutation leading to gene activation and tumor.(3 )
UV exposure has a characteristic role in mutations in Merkel electric cell polyomavirus negative tumors ; however , the role of ultraviolet vulnerability in Merkel cell polyomavirus overconfident neoplasm is also well documented due to immunosuppression . It is speculate that immunosuppression facilitate virus replication that enables the proliferation of irregular cells .
moreover , the consumption of immunosuppressive broker ( azathioprine ) and ultraviolet radiation radiation have a synergistic upshot on mutagenesis and carcinogenesis.(3 )
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