Skin cancer: Difference between revisions
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[[Image:Basaliom1.jpg|thumb|right|250px|A [[basal cell carcinoma]], one of the most common types of skin cancer.]] |
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{{Infobox disease | |
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Name = Skin cancer | =) |
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Image = | |
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Caption = | |
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DiseasesDB = | |
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ICD10 = {{ICD10|C|43||c|43}}-{{ICD10|C|44||c|43}} | |
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ICD9 = {{ICD9|172}}, {{ICD9|173}} | |
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ICDO = 8010-8720 | |
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OMIM = | |
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MedlinePlus = | |
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eMedicineSubj = | |
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MeshID = D012878 | |
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}} |
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'''Skin cancer''' is a [[malignant]] growth on the [[skin]] which can have many causes. The most common skin cancers are [[basal cell cancer]], [[squamous cell cancer]], and [[melanoma]]. Skin [[cancer]] generally develops in the [[Epidermis (skin)|epidermis]] (the outermost layer of skin), so a [[tumor]] is usually clearly visible. This makes most skin cancers detectable in the early stages. There are three common and likely types of skin cancer, each of which is named after the type of skin cell from which it arises. Unlike many other cancers, including those originating in the [[lung]], [[pancreas]], and [[stomach]], only a small minority of those afflicted will actually die of the disease.<ref name = "NCI">National Cancer Institute - Common Cancer Types (http://www.cancer.gov/cancertopics/commoncancers)</ref> Skin cancer represents the most commonly diagnosed cancer, surpassing lung, breast, colorectal and prostate cancer.<ref name="NCI" /> Melanoma is less common than basal cell carcinoma and squamous cell carcinoma, but it is the most serious—for example, in the UK there are 9,500 new cases of melanoma each year, and 2,300 deaths.<ref>http://news.bbc.co.uk/2/hi/health/7985323.stm</ref> More people now die of melanoma in the UK than in Australia. It is the most common cancer in the young population (20 – 39 age group).<ref>http://www.mirror.co.uk/news/top-stories/2009/04/08/skin-cancer-killing-sunbed-generation-115875-21262348/</ref> It is estimated that approximately 85% of cases are caused by too much sun.{{Citation needed|date=January 2009}} Non-melanoma skin cancers are the most common skin cancers. The majority of these are called basal cell carcinomas. These are usually localised growths caused by excessive cumulative exposure to the sun and do not tend to spread. |
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==Risk factors== |
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Skin cancer has many potential causes, these include: |
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# Studies have shown that smoking tobacco and related products can double the risk of skin cancer.<ref>Morita A. "Tobacco smoke causes premature skin aging." J Dermatol Sci 2007 48(3):169-75. 3 September 2008.</ref><ref>http://skincancer.about.com/gi/dynamic/offsite.htm?zi=1/XJ&sdn=skincancer&cdn=health&tm=19&f=00&su=p726.5.336.ip_&tt=2&bt=0&bts=0&zu=http%3A//www.cancer.org/docroot/NWS/content/NWS_1_1x_Smoking_Linked_to_Skin_Cancer.asp</ref> |
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# Overexposure to UV-radiation may cause skin cancer either via the direct DNA damage or via the indirect DNA damage mechanism. Overexposure (burning) UVA & UVB have both been implicated in causing DNA damage resulting in cancer. Sun strength between 10AM and 4PM is most intense. Natural (sun) & artificial UV exposure (tanning salons) are possibly associated with skin cancer.{{Citation needed|date=August 2008}} |
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##UVB rays primarily affect the epidermis causing sunburns, redness, and blistering of the skin when overexposed. The melanin of the epidermis is activated with UVB just as with UVA; however, the effects are longer lasting with pigmentation continuing over 24 hours. |
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# Chronic non-healing wounds, especially burns. These are called [[Marjolin's ulcer]]s based on their appearance, and can develop into squamous cell carcinoma. |
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# Genetic predisposition, including "Congenital Melanocytic Nevi Syndrome". CMNS is characterized by the presence of [[Nevus|"nevi"]] or moles of varying size that either appear at or within 6 months of birth. Nevi larger than 20 mm (3/4") in size are at higher risk for becoming cancerous. |
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# Human papilloma virus (HPV) is often associated with squamous cell carcinoma of the genital, anal, oral, pharynx, and fingers. It is believed that the [[HPV vaccine]] might help to prevent these cancers as well as cervical cancers. |
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# Skin cancer is one of the [[Ultraviolet germicidal irradiation#Potential dangers|potential dangers]] of [[ultraviolet germicidal irradiation]]. |
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<!-- needs source Many believe that skin cancer can be prevented altogether by avoiding sunlight entirely, or wearing protective clothing while outdoors.--> <!-- needs source, and the sentence makes no senseHowever, studies show that Melanoma Skin Cancer is more common in those who work indoors. Skin Cancer is most common on areas of the body that are not normally exposed to the sun, and then exposing the skin to UV rays excessively.--> |
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==Types== |
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The most common types of skin cancers are: |
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* '''Basal Cell Carcinoma''' |
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* '''Squamous Cell Carcinoma''' |
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* '''Melanoma''' |
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[[Basal cell carcinoma]]s (BCC) is the most common. They are present on sun-exposed areas of the skin, especially the face. They rarely metastasize, and rarely cause death. They are easily treated with surgery or radiation. [[Squamous cell carcinoma]]s (SCC) are common, but much less common than basal cell cancers. They metastasize more frequently than BCCs. Even then, the metastasis rate is quite low, with the exception of SCCs of the lip, ear, and in immunosuppressed patients. [[Melanomas]] are the least frequent of the 3 common skin cancers. They frequently metastasize, and are deadly once spread. |
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Less common skin cancers include: [[Dermatofibrosarcoma protuberans]], [[Merkel cell carcinoma]], [[Kaposi's sarcoma]], [[keratoacanthoma]], spindle cell tumors, sebaceous carcinomas, microcystic adnexal carcinoma, Pagets's disease of the breast, atypical fibroxanthoma, leimyosarcoma, and angiosarcoma |
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The BCC and the SCC often carry a UV-signature mutation indicating that these cancers are caused by UV-B radiation via the direct DNA damage. However the malignant melanoma is predominantly caused by UV-A radiation via the indirect DNA damage.{{Citation needed|date=May 2008}} The indirect DNA damage is caused by free radicals and reactive oxygen species. Research indicates that the absorption of three sunscreen ingredients into the skin, combined with a 60-minute exposure to UV, leads to an increase of free radicals in the skin, if applied in too little quantities and too infrequently. <ref name="Hanson">{{cite journal |author=Hanson Kerry M.; Gratton Enrico; Bardeen Christopher J. |title=Sunscreen enhancement of UV-induced reactive oxygen species in the skin |doi=10.1016/j.freeradbiomed.2006.06.011| journal=Free Radical Biology and Medicine |volume=41 |issue=8 |pages=1205–1212 |year=2006 }}</ref> However, the researchers add that newer creams often do not contain these specific compounds, and that the combination of other ingredients tends to retain the compounds on the surface of the skin. They also add the frequent re-application reduces the risk of radical formation. |
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==Skin cancer as a group== |
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Many laymen and even professionals consider the [[basal cell carcinoma]] (BCC), the [[squamous cell carcinoma]] (SCC) and the [[malignant melanoma]] as one group - namely skin cancer. This grouping is problematic for two reasons: |
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* the mechanism that generates the first two forms is different from the mechanism that generates the melanoma. The [[direct DNA damage]] is responsible for BCC and SCC while the [[indirect DNA damage]] causes melanoma. |
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* the mortality rate of BCC and SCC is around 0.3 causing 2000 deaths per year in the US. In comparison the mortality rate of melanoma is 15-20% and it causes 6500 deaths per year.<ref name=BoringCC>{{cite journal |author=C. C. Boring, T. S. Squires and T. Tong |title= Cancer statistics, 1991 |journal=SA Cancer Journal for Clinician |volume=41 |issue= |pages=19–36 |year=1991 |url= http://caonline.amcancersoc.org/cgi/reprint/41/1/19.pdf|doi= 10.3322/canjclin.41.1.19}}</ref>{{rp|29,31}} |
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Even though it is much less common than BCCs and SCCs, malignant melanoma is responsible for 75% of all skin cancer-related deaths.<ref name=AAFP>{{cite journal |last= |first= |authorlink= |coauthors= |year=2000 |month=July |title=Early Detection and Treatment of Skin Cancer |journal=American Family Physician |volume= |issue= |pages= |id= |url=http://www.aafp.org/afp/20000715/357.html |accessdate= 2008-04-21 |quote= }}</ref> |
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While [[sunscreen]] has been shown to protect against BCC and SCC it may not protect against malignant melanoma. When sunscreen penetrates into the skin it generates reactive chemicals<ref name="Hanson" />. It has been found that sunscreen use is [[correlated]] with malignant melanoma. <ref name=Garland> {{cite journal |author=Garland C, Garland F, Gorham E |title=Could sunscreens increase melanoma risk? |url= http://www.ajph.org/cgi/reprint/82/4/614 |journal=Am J Public Health |volume=82 |issue=4 |pages=614–5 |year=1992 |pmid=1546792 |issn= |doi=10.2105/AJPH.82.4.614}}</ref><ref name=Westerdahl2000> {{cite journal |author=Westerdahl J; Ingvar C; Masback A; Olsson H |title= Sunscreen use and malignant melanoma. | journal= International journal of cancer. Journal international du cancer |volume=87 |pages=145–50 |year=2000 |doi= 10.1002/1097-0215(20000701)87:1<145::AID-IJC22>3.0.CO;2-3 }}</ref><ref name=Autier> {{cite journal |author=Autier P; Dore J F; Schifflers E; et al. |title=Melanoma and use of sunscreens: An EORTC case control study in Germany, Belgium and France |url= |journal=Int. J. Cancer |volume=61 |issue= |pages=749–755 |year=1995|doi=10.1002/ijc.2910610602}}</ref><ref name=Weinstock> {{cite journal |author=Weinstock, M. A. |title=Do sunscreens increase or decrease melanoma risk: An epidemiologic evaluation. |url= |journal=Journal of Investigative Dermatology Symposium Proceedings |volume=4 |issue= |pages= 97–100 |year=1999|doi=10.1038/sj.jidsp.}}</ref><ref name=Vainio> {{cite journal |author=Vainio, H., Bianchini, F. |title=Cancer-preventive effects of sunscreens are uncertain. |url= |journal=Scandinavian Journal of Work Environment and Health |volume=26 |issue= |pages=529–31 |year=2000 |issn=}}</ref><ref name=Ainsleigh> {{cite journal |author=Ainsleigh HG |title=Beneficial effects of sun exposure on cancer mortality. |journal=Prev Med. |volume=22 |issue=1 |pages=132–40 |year=1993 |pmid=8475009|doi=10.1006/pmed.1993.1010}}</ref> The lab-experiments and the epidemiological studies suggests that sunscreen use correlates with melanoma incidence. The question that has to be asked is: "Are sunscreen users also the ones with the highest lifetime exposure to ultraviolet lights?" or are sun screens tumor promoters or carcinogens themselves. Logics might suggest that sunscreen users also are the ones most likely to be burned or have been burned by sun light. If it is true that some suncreen induces the formation of skin cancers, the physical sunscreen which are metallic in nature (zinc and titanium) are likely safer and likely to be inert. In the past, most sunscreens were chemical blockers (benzones, etc.). |
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== Signs and symptoms == |
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There are a variety of different skin cancer symptoms. These include changes in the [[skin]] that do not heal, [[Ulcer (dermatology)|ulcering]] in the skin, discolored skin, and changes in existing [[Mole (skin marking)|mole]]s, such as jagged edges to the mole and enlargement of the mole. |
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* ''[[Basal cell carcinoma]]'' usually looks like a raised, smooth, pearly bump on the sun-exposed skin of the [[head]], [[neck]] or [[shoulder]]s. Sometimes small [[blood vessel]]s can be seen within the tumor. Crusting and bleeding in the center of the tumor frequently develops. It is often mistaken for a sore that does not heal. This form of skin cancer is the least deadly and with proper treatment can be completely eliminated with not so much as a single scar. |
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* ''[[Squamous cell carcinoma]]'' is commonly a red, scaling, thickened patch on sun-exposed skin. Ulceration and bleeding may occur. When SCC is not treated, it may develop into a large mass. Squamous cell is the second most common skin cancer. It is dangerous, but not nearly as dangerous as a melanoma. |
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* Most ''[[melanoma]]s'' are brown to black looking lesions. [http://www.melanomawarningsigns.com Melanoma warning signs] that might indicate a malignant melanoma include change in size, shape, color or elevation of a mole. Other signs are the appearance of a new mole during adulthood or new pain, itching, ulceration or bleeding. |
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* ''[[Merkel cell carcinoma]]s'' are most often rapidly growing, non-tender red, purple or skin colored bumps that are not painful or itchy. They may be mistaken for a cyst or other type of cancer.<ref>Merkel cell carcinoma (http://www.merkelcell.org)</ref> |
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== Diagnosis == |
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[[Image:Dermatoscope1.JPG|thumb|A [[dermatoscope]].]] |
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[[Image:Dermatoscope.jpg|thumb|A modern polarized [[dermatoscope]].]] |
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Clinical diagnosis is made with visual appearance or with the aid of a [[dermatoscope]]. The [[ABCD guideline]] is helpful for identifying [[dysplastic nevus]] and [[melanoma]]. Clinical diagnosis can only be confirmed with a [[skin biopsy]]. Most skin biopsies are done under local anesthetic with an injection. A shave biopsy is good for diagnosing basal cell carcinoma, while not as well for squamous cell carcinoma. A punch biopsy is preferred for diagnosing squamous cell carcinoma and melanoma over the shave biopsy technique. Excisional biopsy (where the entire lesion is removed down to the deep dermis and subcutanous fat) is the method of choice for diagnosing melanomas. However, for cosmetic reason and practical reasons, a punch biopsy is often used to initially diagnose many large melanomas or melanomas of cosmetically important anatomic locations (nose, face, eyelids, nails, fingers and toes). |
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==Treatment== |
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Treatment is dependent on type of cancer, location of the cancer, age of the patient, and if the cancer is primary or recurrence. One should look at the specific type of skin cancer ([[basal cell carcinoma]], [[squamous cell carcinoma]], or [[melanoma]]) of concern in order to determine the correct treatment required. An example would be a small [[basal cell cancer]] on the cheek of a young man, where the treatment with the best cure rate ([[Mohs surgery]]) might be indicated. In the case of an elderly frail man with multiple complicating medical problems, a difficult to excise basal cell cancer of the nose might warrant radiation therapy (slightly lower cure rate) or no treatment at all. Topical chemotherapy might be indicated for large superficial basal cell carcinoma for good cosmetic outcome, whereas it might be inadequate for invasive nodular [[basal cell carcinoma]] or invasive [[squamous cell carcinoma]]. |
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For low-risk disease, radiation therapy, topical chemotherapy ([[imiquimod]] or 5-fluorouracil) and cryotherapy (freezing the cancer off) can provide adequate control of the disease; both, however, may have lower overall cure rates than certain type of surgery. Other modalities of treatment such as photodynamic therapy, topical chemotherapy, electrodessication and curettage can be found in the discussions of [[basal cell carcinoma]] and [[squamous cell carcinoma]]. |
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Mohs' micrographic surgery ([[mohs surgery]]) is a technique used to remove the cancer with the least amount of surrounding tissue and the edges are checked immediately to see if tumor is found. This provides the opportunity to remove the least amount of tissue and provide the best cosmetically favorable results. This is especially important for areas where excess skin is limited, such as the face. Cure rates are equivalent to wide excision. Special training is required to perform this technique. |
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In the case of disease that has spread (metastasized), further surgical procedures or [[chemotherapy]] may be required.<ref name="isbn0-7817-5626-X">{{cite book |author=Doherty, Gerard M.; Mulholland, Michael W. |title=Greenfield's Surgery: Scientific Principles And Practice |publisher=Williams & Wilkins |location=Baltimore |year=2005 |pages= |isbn=0-7817-5626-X |oclc= |doi=}}</ref> |
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Scientists have recently been conducting experiments on what they have termed "immune- priming". This therapy is still in its infancy but has been shown to effectively attack foreign threats like viruses and also latch onto and attack skin cancers. More recently researchers have focused their efforts on strengthening the body's own naturally produced "helper T cells" that identify and lock onto cancer cells and help guide the killer cells to the cancer. Researchers infused patients with roughly 5 billion of the helper T cells without any harsh drugs or chemotherapy. This type of treatment if shown to be effective has no side effects and could change the way cancer patients are treated. <ref> [http://news.yahoo.com/s/ap/20080619/ap_on_he_me/med_melanoma_treatment;_ylt=Aix5E64ttYO3GQmORoDBVcis0NUE] </ref> |
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A cream used to treat pre-cancerous skin lesions also reverses signs of aging, a study released in April 2009 indicated.<ref>http://news.bbc.co.uk/2/hi/health/8101677.stm</ref> |
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==Reconstruction after removal of skin cancers== |
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Currently, surgical excision is the most common form of treatment for skin cancers. The goal of reconstructive surgery is restoration of normal appearance and function. The choice of technique in reconstruction is dictated by the size and location of the defect. Excision and reconstruction of facial skin cancers is generally more challenging due to presence of highly visible and functional anatomic structures in the face. |
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When skin defects are small in size, most can be repaired via simple repair whereby skin edges are approximated and closed with sutures. This will result in a linear scar. If the repair is made along a natural skin fold or wrinkle line, the scar will be hardly visible. Larger defects may require repair with a skin graft, local skin flap, pedicled skin flap, or a microvascular free flap. Skin grafts and local skin flaps are by far more common than the other listed choices. |
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Skin grafting is patching of a defect with skin that is removed from another site in the body. The skin graft is sutured to the edges of the defect, and a bolster is placed atop the graft for seven to ten days, to immobilize the graft as it heals in place. There are two forms of skin grafting: split thickness and full thickness. In a split thickness skin graft, a shaver is used to shave a layer of skin from the abdomen or thigh. The donor site, regenerates skin and heals over a period of two weeks. In a full thickness skin graft, a segment of skin is totally removed and the donor site needs to be sutured closed. <ref>{{citeweb|title=Skin Grafts, Full-Thickness|author=Maurice M Khosh, MD, FACS|url=http://emedicine.medscape.com/article/876379-overview|publisher=''[[eMedicine]]''}}</ref> Split thickness grafts can be used to repair larger defects, but the grafts are inferior in their cosmetic appearance. Full thickness skin grafts are more acceptable cosmetically. However, full thickness grafts can only be used for small or moderate sized defects. |
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Local skin flaps are a method of closing defects with tissue that closely matches the defect in color and quality. Skin from the periphery of the defect site is mobilized and repositioned to fill the deficit. Various forms of local flaps can be designed to minimize disruption to surrounding tissues and maximize cosmetic outcome of the reconstruction. Pedicled skin flaps are a method of transferring skin with an intact blood supply from a nearby region of the body. An example of such reconstruction is a pedicled forehead flap for repair of a large nasal skin defect. Once the flap develops a source of blood supply form its new bed, the vascular pedicle can be detached. |
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Source*[http://facedoctornyc.com/cancer-reconstruction.php] |
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==Reduction of risk== |
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Although it is impossible to completely eliminate the possibility of skin cancer, the risk of developing such a cancer can be reduced significantly with the following steps: |
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* avoid the use of tobacco products. |
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* reducing overexposure to ultraviolet (UV) radiation, especially in early years |
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* avoiding sun exposure during the day, especially from 9 AM to 4 PM when the sun is highest in the sky |
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* wearing protective clothing (long sleeves and hats) when outdoors |
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* using a broad-spectrum sunscreen that blocks both UVA and UVB radiation |
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* reapply sun block every 2 hours and after swimming |
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* chemoprevention using topical [[imiquimod]] or 5-fluorouracil{{Citation needed|date=December 2008}} |
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Australian scientist Ian Frazer who developed a vaccine for cervical cancer, says that a vaccine effective in preventing for certain types of skin cancer has proven effective on animals and could be available within a decade. The vaccine would only be effective against Squamous Cell Carcinoma.<ref>Cosmos Online - Skin cancer vaccine within reach (http://www.cosmosmagazine.com/news/2327/skin-cancer-vaccine-within-reach)</ref> |
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== Pathology == |
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Squamous cell carcinoma is a malignant epithelial tumor which originates in epidermis, squamous mucosa or areas of squamous metaplasia. |
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Macroscopically, the tumor is often elevated, [[fungating]], or may be ulcerated with irregular borders. Microscopically, tumor cells destroy the [[basement membrane]] and form sheets or compact masses which invade the subjacent connective tissue (dermis). In well differentiated carcinomas, tumor cells are [[pleomorphic]]/atypical, but resembling normal keratinocytes from prickle layer (large, polygonal, with abundant [[eosinophilic]] (pink) cytoplasm and central nucleus). Their disposal tends to be similar to that of normal epidermis: immature/basal cells at the periphery, becoming more mature to the centre of the tumor masses. Tumor cells transform into [[keratinized]] squamous cells and form round nodules with concentric, laminated layers, called "cell nests" or "epithelial/keratinous pearls". The surrounding stroma is reduced and contains inflammatory infiltrate (lymphocytes). Poorly differentiated squamous carcinomas contain more pleomorphic cells and no [[keratinization]].<ref>{{cite web |url=http://www.pathologyatlas.ro/squamous-cell-carcinoma-skin.php |title="Squamous cell carcinoma (epidermoid carcinoma) - skin" pathologyatlas.ro |accessdate=2007-07-21 |format= |work=}}</ref> |
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==See also== |
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*[[Mohs surgery]] |
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*[[Skin biopsy]] |
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*[[Sun protective clothing]] |
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*[[Sunscreen controversy]] |
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*[[Captain Cutaneum]] |
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== References == |
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{{reflist|2}} |
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== External links == |
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*[http://www.cancer.org/docroot/CRI/CRI_2_3x.asp?dt=51 American Cancer Society's Detailed Guide: Skin Cancer - Basal and Squamous Cell] |
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*[http://www.cancer.org/docroot/CRI/CRI_2_3x.asp?dt=39 American Cancer Society's Detailed Guide: Skin Cancer - Melanoma] |
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*[http://www.skintumor.info skintumor.info Gallery] |
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*[http://www.webmd.com/melanoma-skin-cancer/default.htm Medical Encyclopedia WebMD: Melanoma/Skin Cancer Health Center] |
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*[http://www.webmd.com/melanoma-skin-cancer/skin-cancer-guide/skin-cancer-nonmelanoma-topic-overview Medical Encyclopedia WebMD: Skin Cancer, Non Melanoma Guide] |
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*[http://www.mayoclinic.com/health/skin-cancer/DS00190 Medical Encyclopedia MayoClinic: Skin cancer] |
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*[http://www.melanomawarningsigns.com Skin Cancer] Melanoma Warning Signs |
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*[http://www.nlm.nih.gov/medlineplus/tutorials/skincancerandmelanoma/htm/index.htm Interactive Health Tutorials Medline Plus: Skin cancer] Using animated graphics and you can also listen to the tutorial |
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*[http://www.dmoz.org/Health/Conditions_and_Diseases/Cancer/Skin/ Skin cancer] at the [[Open Directory Project]] |
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*[http://dir.yahoo.com/Health/Diseases_and_Conditions/Skin_Cancer/ Skin cancer] at the [[Yahoo! Directory]] |
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{{Tumors}} |
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{{Tumors of bone, cartilage, skin, connective, and soft tissue}} |
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{{DEFAULTSORT:Skin Cancer}} |
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[[Category:Types of cancer]] |
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[[ar:سرطان الجلد]] |
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[[bs:Rak kože]] |
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[[bg:Рак на кожата]] |
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[[da:Hudkræft]] |
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[[de:Hautkrebs]] |
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[[es:Cáncer de piel]] |
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[[fr:Cancer de la peau]] |
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[[gd:Aillse chraicinn]] |
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[[hr:Rak kože]] |
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[[id:Kanker kulit]] |
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[[is:Húðkrabbamein]] |
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[[he:סרטן עור]] |
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[[kk:Тері рагы]] |
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[[nl:Huidkanker]] |
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[[ja:皮膚がん]] |
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[[no:Hudkreft]] |
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[[pl:Nowotwór złośliwy skóry]] |
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[[pt:Câncer de pele]] |
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[[ro:Cancer la piele]] |
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[[fi:Ihosyöpä]] |
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[[tr:Cilt kanseri]] |
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[[vi:Ung thư da]] |
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