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Squamous-cell carcinoma

Squamous-cell carcinoma, NOS
SCC of the skin tends to arise from pre-malignant lesions, actinic keratoses; surface is usually scaly and often ulcerates (as shown here).
Classification and external resources
Specialty Dermatology, plastic surgery
ICD-10 C44
ICD-9-CM 199
ICD-O M8070/3
MedlinePlus 000829
eMedicine derm/401
MeSH D002294

Squamous-cell carcinoma or squamous-cell cancer (SCC or SqCC) is a cancer of a kind of epithelial cell, the squamous cell. These cells are the main part of the epidermis of the skin, and this cancer is one of the major forms of skin cancer. However, squamous cells also occur in the lining of the digestive tract, lungs, and other areas of the body, and SCC occurs as a form of cancer in diverse tissues, including the lips, mouth, esophagus, urinary bladder, prostate, lung, vagina, and cervix, among others. Despite sharing the name squamous-cell carcinoma, the SCCs of different body sites can show tremendous differences in their presenting symptoms, natural history, prognosis, and response to treatment.

SCC is a histologically distinct form of cancer. It arises from the uncontrolled multiplication of cells of epithelium, or cells showing particular cytological or tissue architectural characteristics of squamous-cell differentiation, such as the presence of keratin, tonofilament bundles, or desmosomes, structures involved in cell-to-cell adhesion.

SCC is still sometimes referred to as "epidermoid carcinoma" and "squamous-cell epithelioma", though the use of these terms has decreased.

SCC typically initially occurs in the sixth decade of life (the 50s), but is most common in the eighth decade (the 70s). It is twice as prevalent in men as in women. People with darker skin are less at risk to develop SCC. Populations with fair skin, light hair, and blue/green/grey eyes are at highest risk of developing the disease. Frequent exposure to direct, strong sunlight without adequate topical protection also increases risk.[1]


  • Signs and symptoms 1
  • Causes 2
    • Human papilloma virus 2.1
    • By region 2.2
      • Skin 2.2.1
      • Head and neck cancer 2.2.2
      • Thyroid 2.2.3
      • Esophagus 2.2.4
      • Lung 2.2.5
      • Penile genitalia 2.2.6
      • Prostate 2.2.7
      • Vagina and cervix 2.2.8
      • Bladder 2.2.9
  • Diagnosis 3
    • Classification 3.1
      • Tissue of origin 3.1.1
      • Morphology 3.1.2
      • Microscopic appearance 3.1.3
  • Prevention 4
  • Management 5
  • Prognosis 6
  • Epidemiology 7
  • See also 8
  • References 9
  • External links 10

Signs and symptoms

Biopsy-proven squamous-cell carcinoma

Symptoms are highly variable depending on the involved organs.

SCC of the skin begins as a small nodule and as it enlarges the center becomes necrotic and sloughs and the nodule turns into an ulcer.

  • 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 tiny blood vessels
  • 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 immunosuppressed patients.

About one-third of lingual and mucosal tumors metastasize before diagnosis (these are often related to tobacco and alcohol use).


Human papilloma virus

Human papilloma virus (HPV) has been associated with SCC of the oropharynx, lung,[2] fingers,[3] and anogenital region.

By region


Squamous-cell carcinoma is the second-most common

  • Information on Squamous Cell Carcinoma from The Skin Cancer Foundation
  • DermNet NZ: Squamous cell carcinoma
  • Squamous cell carcinoma in transplant recipients
  • Including TCC, CIS and papillary tumour SCC
  • Cancer Management Handbook: Head and Neck Tumors
  • - an educational site that provides information about sinus tumors

External links

  1. ^ "Squamous Cell Carcinoma - Causes and Risk Factors". Retrieved August 6, 2014. 
  2. ^ Yu Y, Yang A, Hu S, Yan H (June 2009). "Correlation of HPV-16/18 infection of human papillomavirus with lung squamous cell carcinomas in Western China". Oncol. Rep. 21 (6): 1627–32.  
  3. ^ "Recurrent Squamous Cell Carcinoma In Situ of the Finger". Retrieved 2010-09-22. 
  4. ^ a b Cutaneous squamous cell carcinoma
  5. ^
  6. ^ a b Zwald, FO (2011). "Skin cancer in solid organ transplant recipients: advances in therapy and management: part I. Epidemiology of skin cancer in solid organ transplant recipients.". Journal of American Academy of Dermatology.  
  7. ^ "Squamous Cell Carcinoma: What it Looks Like". 
  8. ^
  9. ^ "Head and Neck Cutaneous Squamous Cell Carcinoma: Epidemiology", Medscape
  10. ^ "Head and Neck Cutaneous Squamous Cell Carcinoma:Background", Medscape
  11. ^
  12. ^ MI Syed, M Stewart, S Syed, S Dahill, C Adams, DR Mclellan, LJ Clark. (2011). "Squamous cell carcinoma of the thyroid gland: primary or secondary disease?". The Journal of Laryngology & Otology 125 (1): 3–9.  
  13. ^ al.], [edited by] Ruth A. Hannon ... [et (2010). Porth pathophysiology : concepts of altered health states (1st Canadian ed.). Philadelphia, PA: Wolters Kluwer Health/Lippincott Williams & Wilkins. p. 660.  
  14. ^ Erythroplasia of rat (Bowen Disease of the Glans Penis) at eMedicine
  15. ^ Berman JJ (November 2004). "Tumor taxonomy for the developmental lineage classification of neoplasms". BMC Cancer 4 (1): 88.  
  16. ^ Berman JJ (March 2004). "Tumor classification: molecular analysis meets Aristotle". BMC Cancer 4 (1): 10.  
  17. ^ Travis, William D; Brambilla, Elisabeth; Muller-Hermelink, H Konrad; et al., eds. (2004). Pathology and Genetics of Tumours of the Lung, Pleura, Thymus and Heart (PDF). World Health Organization Classification of Tumours. Lyon: IARC Press.  
  18. ^ World Health Organization. International Classification of Diseases for Oncology, Second Edition. Geneva, Switzerland: World Health Organization, 1990.
  19. ^ a b c d e Freedberg, et al. (2003). Fitzpatrick's Dermatology in General Medicine. (6th ed.). McGraw-Hill. ISBN 0-07-138076-0.
  20. ^ Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). Dermatology: 2-Volume Set. St. Louis: Mosby.  
  21. ^ Gallagher, RP; Lee, TK; Bajdik, CD; Borugian, M (2010). "Ultraviolet radiation.". Chronic diseases in Canada 29 (Suppl 1): 51–68.  
  22. ^ Gross, K.G.; et al. (1999). Mohs Surgery, Fundamentals and Techniques. Mosby. 
  23. ^ "World Health Organisation assigns CUV1647 generic name" ( 
  24. ^ Clinuvel » Investors » FAQs
  25. ^ PharmaAsia - Clinuvel’s Drug Begins Global Phase II Skin Cancer Trials
  26. ^ Jennings, C (2010). "Management of High-Risk Cutaneous Squamous Cell Carcinoma". Journal of Clinical and Aesthetic Dermatology.  
  27. ^ Chollet A, Hohl D, Perrier P (April 2012). "[Risk of cutaneous squamous cell carcinomas: the role of clinical and pathological reports]" 8 (335). pp. 743–6.  
  28. ^ Brantsch Kay D, Meisner Christoph, Schönfisch Birgitt, Trilling Birgit, Wehner-Caroli Jörg, Röcken Martin, Breuninger Helmut (2008). Analysis of risk factors determining prognosis of cutaneous squamous-cell carcinoma: a prospective study.  
  29. ^ Bethune G, Campbell J, Rocker A, Bell D, Rendon R, Merrimen J. (2012) Clinical and pathologic factors of prognostic significance in penile squamous-cell carcinoma in a North American population., doi:10.1016/j.urology.2011.12.048 PMID 22386252
  30. ^ Chapman, JR (2013). "Cancer in the Transplant Recipient". PerspectivesMedicine. 
  31. ^ Maula, Sanna-Mari. Luukkaa, Marjaana. Grénman, Reidar. Jackson, David. Jalkanen, Sirpa. Ristamäki, Raija. (2003), [3] Intratumoral Lymphatics Are Essential for the Metastatic Spread and Prognosis in Squamous Cell Carcinomas of the Head and Neck Region,
  32. ^ Hiroko Ide, Tsutomu Nakamura, Kazuhiko Hayashi, Takeshi Endo, Ataru Kobayashi, Reiki Eguchi, Fujio Hanyu. (1994), [4], Esophageal squamous cell carcinoma: Pathology and prognosis, doi:10.1007/BF00316810
  33. ^ "WHO Disease and injury country estimates". World Health Organization. 2009. Retrieved Nov 11, 2009. 
  34. ^ Kari, PS (2012). "Cutaneous squamous cell carcinoma: estimated incidence of disease, nodal metastasis, and deaths from disease in the United States, 2012". Journal of American Academy of Dermatology.  


See also

The incidence of squamous-cell carcinoma continues to rise around the world. A recent study estimated that there are between 180,000 to 400,000 cases of SCC in the United States in 2013.[34] Risk factors for squamous-cell carcinoma varies with age, gender, race, geography, and genetics. The incidence of SCC increases with age and the peak incidence is usually around 60 years old. Males are affected with SCC at a ratio of 2:1 in comparison to females. Caucasians are more likely to be affected, especially those with fair Celtic skin and chronically exposed to UV radiation. Squamous-cell carcinoma of the skin is the most common among all sites of the body. Solid organ transplant recipients (heart, lung, liver, pancreas, among others) are also at a heightened risk of developing aggressive, high-risk SCC. There are also a few rare congenital diseases predisposed to cutaneous malignancy. In certain geographic locations, exposure to arsenic in well water or from industrial sources may significantly increase the risk of SCC.[4]

Age-standardized death from melanoma and other skin cancers per 100,000 inhabitants in 2004.[33]
  no data
  less than 0.7
  more than 7.7


Carcinomas of the esophagus were found in one study to have a 58% mean rate of metastasis to local lymph nodes. In the same study, the number of lymph nodes compromised was correlated with a decrease of the survival rate.[32] The study found that in cases of lymphatic metastasis, the mean 5-year survival rate was 49.5%, with a decrease for every lymph node compromised.

Squamous-cell carcinomas of the head and neck have been found to have a greater risk of metastasis to the local nervous system, lymphatic system, hence possibly reducing treatment efficacy.[31]

The long-term outcome of squamous-cell carcinomas is dependent upon several factors: the sub-type of the carcinoma, available treatments, location(s) and severity, and various patient health-related variables (accompanying diseases, age, etc.). Generally, the long-term outcome is positive, as less than 4% of Squamous-cell carcinoma cases are at risk of metastasis.[27][28] Some particular forms of squamous-cell carcinomas have a higher mortality rate. One study found squamous-cell carcinoma of the penis had a much greater rate of mortality than some other forms of squamous-cell carcinoma, that is, about 23%,[29] although this relatively high mortality rate may be associated with possibly latent diagnosis of the disease due to patients avoiding genital exams until the symptoms are debilitating, or refusal to submit to a possibly scarring operation upon the genitalia. Squamous-cell carcinoma occurring in the organ transplant population is also associated with a higher risk of mortality.[30]


In general, squamous-cell carcinomas have a high risk of local recurrence, and up to 50% do recur.[26] Frequent skin exams with a dermatologist is recommended after treatment.

In 2007, Australian biopharmaceutical company Clinuvel Pharmaceuticals Limited began actinic keratosis.[24][25]

Imiquimod (Aldara) has been used with success for squamous-cell carcinoma in situ of the skin and the penis, but the morbidity and discomfort of the treatment is severe. An advantage is the cosmetic result: 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.

Adjuvant therapy may be considered in those with high-risk SCC even in the absence of evidence for local mestastasis.

2) Radiotherapy.

1) Surgical block dissection- if palpable nodes or in cases of Marjolin's ulcers but the benefit of prophylactic block lymph node dissection with Marjolin's ulcers is not proven.

Nodal spread:

High-risk squamous-cell carcinoma, as defined by those occurring around the eye, ear, or nose, is of large size, is poorly differentiated, and grows rapidly, requires more aggressive, multidisciplinary management.

Electrodessication and curettage or EDC can be done on selected squamous-cell carcinoma of the skin. In areas where SCC's are known to be non-aggressive, and where the patient is not immunosuppressed, EDC can be performed with good to adequate cure rate.

Mohs surgery is frequently utilized; considered the treatment of choice for squamous-cell carcinoma of the skin, physicians have also utilized the method for the treatment of squamous-cell carcinoma of the mouth, throat, and neck.[22] An equivalent method of the CCPDMA standards can be utilized by a pathologist in the absence of a Mohs-trained physician. Radiation therapy is often used afterward in high risk cancer or patient types.

Most squamous-cell carcinomas are removed with surgery. A few selected cases are treated with topical medication. Surgical excision with a free margin of healthy tissue is a frequent treatment modality. Radiotherapy, given as external beam radiotherapy or as brachytherapy (internal radiotherapy), can also be used to treat squamous-cell carcinomas.


Appropriate sun-protective clothing, use of broad-spectrum (UVA/UVB) sunscreen with at least SPF 50, and avoidance of intense sun exposure may prevent skin cancer.[21]


  • Adenoid squamous-cell carcinoma' (also known as "Pseudoglandular squamous-cell carcinoma"), characterized by a tubular microscopic pattern and keratinocyte acantholysis.[19]:743
  • Basaloid squamous-cell carcinoma is characterized by a predilection for the tongue base.[19]:743
  • Clear-cell squamous-cell carcinoma (also known as "Clear-cell carcinoma of the skin") is characterized by keratinocytes that appear clear as a result of hydropic swelling.[19]:743
  • Signet-ring-cell squamous-cell carcinoma (occasionally rendered as "signet-ring-cell squamous-cell carcinoma") is a histological variant characterized by concentric rings composed of keratin and large vacuoles corresponding to markedly dilated endoplasmic reticulum.[19]:743 These vacuoles grow to such an extent that they radically displace the cell nucleus toward the cell membrane, giving the cell a distinctive superficial resemblance to a "signet ring" when viewed under a microscope.
  • Spindle-cell squamous-cell carcinoma (also known as "Spindle-cell carcinoma"[20]) is a subtype characterized by spindle-shaped atypical cells.[19]:743

One method of classifying squamous-cell carcinomas is by their appearance under microscope. Subtypes may include:

Microscopic appearance

  • Bowen's disease is a sunlight-induced skin disease, and is considered to be an early form of squamous-cell carcinoma.
  • Erythroplasia of Queyrat
  • Keratoacanthoma is a low-grade malignancy of the skin. It originates in the pilo-sebaceous glands, and is similar in clinical presentation and microscopic analysis to squamous-cell carcinoma, except that it contains a central keratin plug. Statistically, it is less likely to become invasive than squamous-cell carcinoma.
  • Marjolin's ulcer is a type of squamous-cell carcinoma that arises from a non-healing ulcer or burn wound.


Other variants of squamous-cell carcinoma are recognized under other systems, such as:

  • Papillary thyroid carcinoma (Code 8050/3)
  • Verrucous squamous-cell carcinoma (Code 8051/3)
  • Papillary squamous-cell carcinoma (Code 8052/3)
  • Squamous-cell carcinoma (Code 8070/3)
  • Large cell keratinizing squamous-cell carcinoma (Code 8071/3)
  • Large cell nonkeratinizing squamous-cell carcinoma (Code 8072/3)
  • Small cell keratinizing squamous-cell carcinoma (Code 8073/3)
  • Spindle cell squamous-cell carcinoma(Code 8074/3)
  • Adenoid/pseudoglandular squamous-cell carcinoma(Code 8075/3)
  • Intraepidermal squamous-cell carcinoma (Code 8081/3)
  • Lymphoepithelial carcinoma (Code 8082/3)

The International Classification of Diseases for Oncology (ICD-O) system lists a number of morphological subtypes and variants of malignant squamous-cell neoplasms, including:[18]

Tissue of origin

metastasis, or "secondary tumor".


The pathological appearance of a squamous-cell cancer varies with the depth of the biopsy. For that reason, a biopsy including the subcutaneous 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 inadequate biopsy might be read as actinic keratosis with follicular involvement. A deeper biopsy down to the dermis or subcutaneous tissue might reveal the true cancer. 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.

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


Most bladder cancer is transitional cell, but bladder cancer associated with Schistosomiasis is often squamous-cell carcinoma.


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.

Vagina and cervix

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.


When squamous-cell carcinoma in situ (Bowen's disease) is found on the penis, it is called erythroplasia of Queyrat.[14] This type of cancer responds very well to imiquimod.

Penile genitalia

It is primarily due to smoking.[13]

When associated with the lung, it is typically a centrally located large cell cancer (non-small cell lung cancer or NSCLC). It often has a paraneoplastic syndrome causing ectopic production of parathyroid hormone-related protein (PTHrP), resulting in hypercalcemia, however paraneoplastic syndrome is more commonly associated with small cell lung cancer.

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


Oesophageal 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.


Primary squamous-cell thyroid carcinoma shows an aggressive biological phenotype resulting in poor prognosis for patients.[12]


Ninety percent[11] of cases of head and neck cancer (cancer of the mouth, nasal cavity, nasopharynx, throat and associated structures) are due to squamous-cell carcinoma.

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

Head and neck cancer

Squamous-cell carcinoma are generally treated by surgical excision, Mohs surgery or electrodessication and curettage. Non-surgical options for the treatment of cutaneous SCC include topical chemotherapy, topical immune response modifiers, photodynamic therapy (PDT), radiotherapy, and systemic chemotherapy. The use of topical therapy, such as Imiquimod cream and PDT is generally limited to premalignant (i.e., AKs) and in situ lesions. Radiation therapy is a primary treatment option for patients in whom surgery is not feasible and is an adjuvant therapy for those with metastatic or high-risk cutaneous SCC. At this time, systemic chemotherapy is used exclusively for patients with metastatic disease.

SCCs represent about 20% of the non-melanoma skin cancers, but due to their more obvious nature and growth rates, they represent 90% of all head and neck cancers that are initially presented.[9] The vast majority of SCCs are those of the skin, and like all skin cancers, are the result of ultraviolet exposure. SCCs usually occur on portions of the body commonly exposed to the Sun; the face, ears, neck, hands, or arm. The main symptom is a growing bump that may have a rough, scaly surface and flat reddish patches. Unlike basal-cell carcinomas, SCCs carry a significant risk of metastasis, often spreading to local nerves or the lymph nodes,[10] and are thus more dangerous. During its earliest stages, it is sometimes known as Bowen's disease.

[8] In a recent study, it has also been shown that the deletion or severe down-regulation of a gene titled Tpl2 (tumor progression locus 2) may be involved in the progression of normal keratinocytes into becoming squamous-cell carcinoma.[7]) tend to be much more aggressive, regardless of their location.leukemia Heart and lung transplant recipients are at the highest risk of developing SCC due to more intensive immunosuppressive medications used. Squamous-cell cancers of the skin in individuals on immunotherapy or suffering from lymphoproliferative disorders (i.e. [6] The incidence of SCC development increases with time posttransplant.[6]

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