Squamous cell carcinoma of the skin

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Aditya Govindavarjhulla, M.B.B.S. [2], Raviteja Guddeti, M.B.B.S. [3]

Signs & Symptoms

• The lesion caused by SCC is often asymptomatic
• Ulcer or reddish skin plaque that is slow growing
• Intermittent bleeding from the tumor, especially on the lip
• The clinical appearance is highly variable
• Usually the tumor presents as an ulcerated lesion with hard, raised edges
• The tumor may be in the form of a hard plaque or a papule, often with an opalescent quality, with telangiectasia
• The tumor can lie below the level of the surrounding skin, and eventually ulcerates and invades the underlying tissue
• The tumor commonly presents on sun-exposed areas (e.g. back of the hand, scalp, lip, and superior surface of pinna)
• On the lip, the tumor forms a small ulcer, which fails to heal and bleeds intermittently
• Evidence of chronic skin photodamage, such as multiple actinic keratoses (solar keratoses)
• The tumor grows relatively slowly
• Unlike basal cell carcinoma (BCC), squamous cell carcinoma (SCC) has a substantial risk of metastasis
• Risk of metastasis is higher in SCC arising in scars, on the lower lips or mucosa, and occurring in immunosupressed patients. About *one-third of lingual and mucosal tumors metastasize before diagnosis (these are often related to tobacco and alcohol use)

Diagnosis

Diagnosis is via a biopsy. For the skin, look under skin biopsy.

The pathological appearance of a squamous cell cancer varies with the depth of the biopsy. For that reason, a biopsy including the subcutanous tissue and basalar epithelium, to the surface is necessary for correct diagnosis. The performance of a shave biopsy (see skin biopsy) might not acquire enough information for a diagnosis. An excision biopsy is ideal, but not practical in most cases. An incisional or punch biopsy is preferred. A shave biopsy is least ideal, especially if only the superficial portion is acquired.

Physical Examination

Skin

Squamous cell carcinoma of the skin is often caused by long term exposure to the sun. To be diagnosed, a biopsy is done where a sample is taken and examined under a microscope by a Pathologist. If it is found to be cancerous, a surgery is done to remove it.

Squamous cell carcinomas account for about 20% of non-melanoma skin cancers, (with basal cell carcinomas accounting for about 80%), and are clinically more significant because of their ability to metastasize. Squamous cell carcinoma is usually developed in the epithelial layer of the skin and sometimes in various mucous membranes of the body.

Squamous cell carcinoma is the second most common cancer of the skin (after basal cell carcinoma but more common than melanoma). It usually occurs in areas exposed to the sun, and can generally be treated by excision or mohs surgery only.

Sunlight exposure and immunosuppression are risk factors for SCC of the skin with chronic sun exposure being the strongest environmental risk factor. The risk of metastasis is low, but is much higher than basal cell carcinoma.

Squamous cell cancers of the lip and ears have high metastatic and recurrence rate (20 to 50%). Squamous cell cancers of the skin in individuals on immunotherapy or having lymphoproliferative disorders (leukemias) are much more aggressive, regardless of their location.

Australian scientist Ian Frazer who developed the cervical cancer vaccine, says that animal tests have been effective in preventing squamous cell carcinoma in animals, and there may be a human vaccine against this kind of skin cancer within the decade.

Ear Nose and Throat

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  Squamous cell carcinoma in oral cavity.
  Image courtesy of Professor Peter Anderson DVM PhD and published with permission © PEIR, University of Alabama at Birmingham, Department of Pathology

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  Squamous cell carcinoma in oral cavity.
  Image courtesy of Professor Peter Anderson DVM PhD and published with permission © PEIR, University of Alabama at Birmingham, Department of Pathology

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  Squamous cell carcinoma in oral cavity.
  Image courtesy of Professor Peter Anderson DVM PhD and published with permission © PEIR, University of Alabama at Birmingham, Department of Pathology

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  Squamous cell skin cancer.

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  A large squamous cell carcinoma of the tongue

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  This patient had two adjacent cancers. The flat black lesion below the antitragus is a malignant melanoma. The white elevated keratotic lesion is a squamous cell carcinoma .

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  Squamous Cell Cancer of the Mouth: Irregular, necrotic appearing tissue on the inside of the mouth due to extensive squamous cell cancer. Patient has limited ability to open his mouth (aka trismus) as a result of the infiltrating cancer.

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  Squamous Cell Cancer, Base of Tongue: Note white area with swelling, right base of tongue.

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  Squamous Cell Cancer of the Mouth: Cancer that began along the lower gum line has spread to left submandibular lymph nodes.

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  Squamous Cell Cancer of the Mouth: Cancer that began along the lower gum line has spread to left submandibular lymph nodes.

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  Recurrent squamous cell carcinoma of the auricle (far left) excised with a stellate incision across the antihelix.

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  The final result of the excision.

Esophagus

Esophageal cancer may be due to either squamous cell carcinoma (ESCC) or adenocarcinoma (EAC). SCCs tend to occur closer to the mouth, while adenocarcinomas occur closer to the stomach. Dysphagia (difficulty swallowing, solids worse than liquids) and odynophagia are common initial symptoms. If the disease is localized, esophagectomy may offer the possibility of a cure. If the disease has spread, chemotherapy and radiotherapy are commonly used.

Penis

When squamous cell carcinoma in situ (Bowen's disease) is found on the penis, it is called erythroplasia of Queyrat. This type of cancer respond very well to an experimental agent called Aldara.

Prostate

When associated with the prostate, squamous cell carcinoma is very aggressive in nature. It is difficult to detect as there is no increase in prostate specific antigen levels seen; meaning that the cancer is often diagnosed at an advanced stage.

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  Prostate: Squamous cell carcinoma

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  Prostate: Squamous cell carcinoma

Lung

When associated with the lung, it often causes ectopic production of parathyroid hormone-related protein (PTHrP), resulting in hypercalcemia.

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  Biopsy of a highly differentiated squamous cell carcinoma of the mouth. Haematoxylin & eosin stain.

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  Photograph of a squamous cell carcinoma. Tumour is on the left, obstructing the bronchus (lung). Beyond the tumour the bronchus is inflammed and contains mucus

Vagina and cervix

Vaginal squamous cell carcinoma spreads slowly and usually stays near the vagina, but may spread to the lungs and liver. This is the most common type of vaginal cancer.

Cervix: Squamous cell carcinoma

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Experimental treatments

In 2007, Australian biopharmaceutical company Clinuvel Pharmaceuticals Limited began clinical trials with a melanocyte-stimulating hormone called melanotan (known by the International Nonproprietary Name afamelanotide, formerly CUV1647) to provide photoprotection for organ transplant patients against squamous cell carcinoma of the skin and actinic keratosis.

While Mohs surgery is frequently utilized and often considered the treatment of choice for squamous cell carcinoma of the skin, physicians have utilized the method for the treatment of squamous cell carcinoma of the mouth, throat, and neck.

Aldara (Imiquimod) has been used with great success for squamous cell carcinoma in situ of the skin and the penis. After treatment, the skin resembles normal skin without the usual scarring and morbidity associated with standard excision. Imiquimod is not FDA approved for any squamous cell carcinoma.

External links

• Information on Squamous Cell Carcinoma from The Skin Cancer Foundation
• Article by Stephen D Hess, MD, PhD
• DermNet NZ: Squamous cell carcinoma
• Squamous cell carcinoma in transplant recipients

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