Oral cancer

Oral cancer
Other names	Cancer of the lip, oral cavity and pharynx, mouth cancer, cancer of the lips, oral cavity and pharynx
Oral cancer on the side of the tongue, a common site along with the floor of the mouth
Specialty	Oncology, oral and maxillofacial surgery, ENT surgery
Symptoms	Persistent rough white or red patch in the mouth lasting longer than 2 weeks, ulceration, lumps/bumps in the neck, pain, loose teeth, difficulty swallowing
Risk factors	Smoking, alcohol, HPV infection, sun exposure, chewing tobacco
Diagnostic method	Tissue biopsy
Differential diagnosis	Non-squamous cell carcinoma oral cancer, salivary gland tumors, benign mucosal disease
Prevention	Avoiding risk factors, HPV vaccination
Treatment	Surgery, radiation, chemotherapy
Prognosis	Five-year survival ~ 65% (US 2015)
Frequency	355,000 new cases (2018)
Deaths	177,000 (2018)

Oral cancer, also known as mouth cancer, is a cancer of the lining of the lips, mouth, or upper throat. In the mouth, it most commonly starts as a painless white patch, that thickens, develops red patches, an ulcer, and continues to grow. When on the lips, it commonly looks like a persistent crusting ulcer that does not heal, and slowly grows. Other symptoms may include difficult or painful swallowing, new lumps or bumps in the neck, a swelling in the mouth, or a feeling of numbness in the mouth or lips.

Risk factors include tobacco and alcohol use. Those who use both alcohol and tobacco have a 15 times greater risk of oral cancer than those who use neither. Other risk factors include HPV infection, chewing paan, and sun exposure on the lower lip. Oral cancer is a subgroup of head and neck cancers. Diagnosis is made by biopsy of the concerning area, followed by investigation with CT scan, MRI, PET scan, and examination to determine if it has spread to distant parts of the body.

Oral cancer can be prevented by avoiding tobacco products, limiting alcohol use, sun protection on the lower lip, HPV vaccination, and avoidance of paan. Treatments used for oral cancer can include a combination of surgery (to remove the tumor and regional lymph nodes), radiation therapy, chemotherapy, or targeted therapy. The types of treatments will depend on the size, locations, and spread of the cancer taken into consideration with the general health of the person.

In 2018, oral cancer occurred globally in about 355,000 people, and resulted in 177,000 deaths. Between 1999 and 2015 in the United States, the rate of oral cancer increased 6% (from 10.9 to 11.6 per 100,000). Deaths from oral cancer during this time decreased 7% (from 2.7 to 2.5 per 100,000). Oral cancer has an overall 5 year survival rate of 65% in the United States as of 2015. This varies from 84% if diagnosed when localized, compared to 66% if it has spread to the lymph nodes in the neck, and 39% if it has spread to distant parts of the body. Survival rates also are dependent on the location of the disease in the mouth.

Signs and symptoms

Swelling of the right neck from the spread of oral cancer.

Ulceration on the left lower lip caused by cancer

The signs and symptoms of oral cancer depend on the location of the tumor but are generally thin, irregular, white patches in the mouth. They can also be a mix of red and white patches. The classic warning sign is a persistent rough patch with ulceration, and a raised border that is minimally painful. On the lip, the ulcer is more commonly crusting and dry, and in the pharynx it is more commonly a mass. It can also be associated with loose teeth, bleeding gums, persistent ear ache, a feeling of numbness in the lip and chin, or swelling.

When the cancer extends to the throat, there can also be difficulty swallowing (usually a base of tongue HPV16+ cancer) or a visibly enlarged tonsil unilaterally, also from the same etiology, painful swallowing, and an altered voice. Typically, the lesions have very little pain until they become larger and then are associated with a burning sensation. As the lesion spreads to the lymph nodes of the neck, a painless, hard mass will develop. If it spreads elsewhere in the body, general aches can develop, most often due to bone metastasis.

Causes

The main causes of oral cancer are alcohol and tobacco (smoked or chewed). The risk is especially high when a person regularly uses both. The more is consumed of either the higher the risk of developing oral cancer. Like all environmental factors, the rate at which cancer will develop is dependent on the dose, frequency and method of application of the carcinogen (the substance that is causing the cancer). Aside from tobacco and alcohol, other carcinogens for oral cancer include viruses (particularly HPV 16 and 18), radiation, and UV light.

Tobacco

Tobacco is the greatest single cause of oral and pharyngeal cancer. Using tobacco increases the risk of oral cancer by 3 to 6 times and is responsible for around 40% of all oral cancers. Smokeless tobacco (including chewing tobacco, snuff, snus) also causes oral cancer. Cigar and pipe smoking are also important risk factors.

The use of electronic cigarettes may also lead to the development of head and neck cancers due to the substances like propylene glycol, glycerol, nitrosamines, and metals contained therein, which can cause damage to the airways.

Use of marijuana, has currently not been shown to be associated with head and neck cancer risk.

Alcohol

Drinking alcohol is a major cause of oral cancer. It was responsible for 20% of global oral cancer cases in 2020. The more alcohol is consumed regularly the higher the risk but light drinking still somewhat increases the chances of getting oral cancer. The risk is especially high when both alcohol and tobacco are used.

It has been controversial if the use of alcohol-based mouthwashes increases oral cancer risk. As of 2023 is not enough evidence to suggest that alcohol-based mouthwashes can alone cause oral cancer. However when other risk factors are also present (smoking, drinking) then it can contribute to further increasing the risk of oral cancer.

Human papillomavirus

Main article: HPV-positive oropharyngeal cancer

Infection with human papillomavirus (HPV), particularly type 16, is a cause of oral and oropharyngeal cancer. HPV16 (along with HPV18) is the same virus responsible for the vast majority of all cervical cancers and is the most common sexually transmitted infection. Risk factors for developing HPV-positive oral cancer include multiple sexual partners, anal and oral sex and a weak immune system.

Oral cancer in this group tends to favor the tonsil and tonsillar pillars, base of the tongue, and the oropharynx. Whereas oral cancer caused by tobacco and alcohol usually affects people over 50, HPV-positive oral cancer more often develops in younger people. People who develop the disease from this particular cause have a significantly better survival rates compared to HPV-negative oral cancer. The better outcomes for HPV-positive oral cancer are partly due to its better response to radiotherapy.

The incidence of HPV-related oral and oropharyngeal cancer is increasing, especially in the Western world. In the United States, the incidence of HPV-positive oropharyngeal cancer has overtaken HPV-positive cervical cancer as the leading HPV related cancer type. An increased incidence has particularly affected males. As a result, recent changes have resulted in the HPV vaccine being offered to adolescent boys between 12-13 (previously only offered to girls between this age due to cervical cancer risks) and men under 45 who have sex with men in the UK.

Betel nut

Stall selling betel quid

Chewing betel quid (paan) and Areca nut-based products is known to be a strong risk factor for developing oral cancer even in the absence of tobacco. It doubles the risk of oral cancer 2.1 times and when chewed with additional tobacco in its preparation (like in gutka), there is an even higher risk.

In India where such practices are common, oral cancer represents up to 40% of all cancers, compared to just 4% in the UK.

Stem cell transplantation

People after hematopoietic stem cell transplantation (HSCT) are at a higher risk for oral cancer. Post-HSCT oral cancer may have more aggressive behavior with poorer prognosis, when compared to oral cancer in people not treated with HSCT. This effect is supposed to be owing to the continuous lifelong immune suppression and chronic oral graft-versus-host disease.

Premalignant lesions

Oral leukoplakia (white patch) on the left tongue. Proven to be severe dysplasia on biopsy

A premalignant (or precancerous) lesion is defined as "a benign, morphologically altered tissue that has a greater than normal risk of malignant transformation." There are several different types of premalignant lesion that occur in the mouth. Some oral cancers begin as white patches (leukoplakia), red patches (erythroplakia) or mixed red and white patches (erythroleukoplakia or "speckled leukoplakia"). Other common premalignant lesions include oral submucous fibrosis and actinic cheilitis. In the Indian subcontinent oral submucous fibrosis is very common due to betel nut chewing. This condition is characterized by limited opening of mouth and burning sensation on eating of spicy food. This is a progressive lesion in which the opening of the mouth becomes progressively limited, and later on even normal eating becomes difficult.

Pathophysiology

Main article: Carcinogenesis

Oral squamous cell carcinoma is the end product of an unregulated proliferation of mucous basal cells. A single precursor cell is transformed into a clone consisting of many daughter cells with an accumulation of altered genes called oncogenes. What characterizes a malignant tumor over a benign one is its ability to metastasize. This ability is independent of the size or grade of the tumor (often seemingly slow growing cancers like the adenoid cystic carcinoma can metastasis widely). It is not just rapid growth that characterizes a cancer, but their ability to secrete enzymes, angiogeneic factors, invasion factors, growth factors and many other factors that allow it to spread.

The full causal relation between alcohol consumption and the elevated risk of cancer remains unclear, but acetaldehyde plays a major role. Immediately after alcohol consumption, there are elevated levels of acetaldehyde in saliva, peaking after about 2 minutes. Acetaldehyde is produced by the oral microbiome, and also by enzymes in the oral mucosa, saliva glands, and liver. It is also naturally present in alcoholic beverages. Of these, the microbiome is the major contributor, accounting for at least half of the acetaldehyde present. Poor oral hygiene, smoking, and heavy drinking induce an increase in acetaldehyde-producing bacteria in the mouth. Many species of bacteria contribute to acetaldehyde production and their epidemiological significance is not known. The acetaldehyde reacts with oral epithelial cells, inducing DNA modifications, which can lead to mutations and cancer development. The ability to metabolize acetaldehyde in the mouth is limited, so it may remain in the saliva for hours. L-cysteine tablets may be used to decrease acetaldehyde exposure in the oral cavity.

Diagnosis

A large squamous cell carcinoma of the tongue as seen on CT imaging

Histopathologic appearance of a poorly differentiated squamous cell carcinoma specimen. Hematoxylin-eosin stain. p16 positive, EBV negative

Diagnosis of oral cancer is completed for (1) initial diagnosis, (2) staging, and (3) treatment planning. A complete history, and clinical examination is first completed, then a wedge of tissue is cut from the suspicious lesion for tissue diagnosis. This might be done with scalpel biopsy, punch biopsy, fine or core needle biopsy. In this procedure, the surgeon cuts all, or a piece of the tissue, to have it examined under a microscope by a pathologist. Brush biopsies are not considered accurate for the diagnosis of oral cancer. Salivary biomarkers are also being under investigation with emerging outcomes and could potentially be used as a non-invasive diagnostic tool in the future.

With the first biopsy, the pathologist will provide a tissue diagnosis (e.g. squamous cell carcinoma), and classify the cell structure. They may add additional information that can be used in staging, and treatment planning, such as the mitotic rate, the depth of invasion, and the HPV status of the tissue.

After the tissue is confirmed cancerous, other tests will be completed to:

• better assess the size of the lesion (CT scan, MRI or PET scan with 18F-fluorodeoxyglucose (FDG)),
• look for other cancers in the upper aerodigestive tract (which may include endoscopy of the nasal cavity/pharynx, larynx, bronchus, and esophagus called panendoscopy or quadoscopy),
• spread to the lymph nodes (CT scan) or
• spread to other parts of the body (chest X-ray, nuclear medicine).

Other, more invasive tests, may also be completed such as fine needle aspiration, biopsy of lymph nodes, and sentinel node biopsy. When the cancer has spread to lymph nodes, their exact location, size, and spread beyond the capsule (of the lymph nodes) needs to be determined, as each can have a significant impact on treatment and prognosis. Small differences in the pattern of lymph node spread, can have a significant impact on treatment and prognosis. Panendoscopy may be recommended, because the tissues of the entire upper aerodigestive tract are generally affected by the same carcinogens, so other primary cancers are a common occurrence.

From these collective findings, taken in consideration with the health and desires of the person, the cancer team develops a plan for treatment. Since most oral cancers require surgical removal, a second set of histopathologic tests will be completed on any tumor removed to determine the prognosis, need for additional surgery, chemotherapy, radiation, immunotherapy, or other interventions.

Classification

Oral cancer is a subgroup of head and neck cancers which includes those of the oropharynx, larynx, nasal cavity and paranasal sinuses, salivary glands, and thyroid gland. Oral melanoma, while part of head and neck cancers is considered separately. Other cancers can occur in the mouth (such as bone cancer, lymphoma, or metastatic cancers from distant sites) but are also considered separately from oral cancers.

Staging

Oral cancer staging is an assessment of the degree of spread of the cancer from its original source. It is one of the factors affecting both the prognosis and the potential treatment of oral cancer.

The evaluation of squamous cell carcinoma of the mouth and pharynx staging uses the TNM classification (tumor, node, metastasis). This is based on the size of the primary tumor, lymph node involvement, and distant metastasis.

TNM classification cancer of the oral cavity (does not apply to HPV+ or HPV- oralpharyngeal cancers)

T: Primary tumor TX Primary tumor cannot be assessed Tis Carcinoma in situ T1 Tumor ≤ 2 cm with depth of invasion (DOI*) ≤5mm T2 Tumor ≤ 2 cm with DOI* >5mm or tumor >2 cm and ≤ 4 cm with DOI* ≥10mm T3 Tumor > 2 cm and ≤4 cm with DOI* > 10mm or tumor >4 cm with DOI* ≤ 10mm T4 Moderately advanced or very advanced local disease T4a Moderately advanced local disease, tumor >4 cm with DOI* >10mm or tumor invades adjacent structures only (cortical bone of the mandible or maxilla (excluding superficial erosion of tooth socket alone in gingival tumors) or involves the maxillary sinus or skin of the face) T4b Very advanced local disease. Tumor invades masticator space, pterygoid plates, or skull base and/or encases the internal carotid artery *DOI is depth of invasion and not tumor thickness. N: Clinical Lymph nodes (separate classification for pathologic classification) NX Regional lymph nodes cannot be assessed N0 No regional lymph node metastasis N1 Metastasis in a single ipsilateral lymph node, <3 cm and ENE(−) N2 Metastasis in a single ipsilateral lymph node, ≤3 cm or smaller and ENE(+) or >3 cm and ≤6 cm and ENE(−); or metastases in multiple ispsilateral lymph nodes, none >6 cm and ENE(−); or in bilateral or contralateral lymph nodes(s), non >6 cm ENE(−) N2a Metastasis in a single ipsilateral node <3 cm and ENE(+); or a single ipsilatereral node ≥3 cm and <6 cm and ENE(−) N2b Metastases in multiple ipsilateral nodes, <6 cm and ENE(−) N2c Metastases in bilateral or contralateral lymph node(s); <6 cm and ENE(−) N3 Metastasis in a lymph node ≥6 cm and ENE(−); or metastasis in any node(s) and clinically overt ENE(+) N3a Metastasis in a lymph node ≥6 cm and ENE(−) N3b Metastasis in any node(s) and clinically overt ENE(+) Note: A designation of "U" or "L" may be used for any N category to indicate metastasis above (U) or below (L) the lower border of the cricoid. ENE(+/−) indicates presence or absence of extranodal disease M: Metastasis cM0 No distant metastasis cM1 Distant metastasis pM1 Distant metastasis, microscopically confirmed

Spread of cancer beyond the capsule of a lymph node (ENE+).

TMN evaluation allows the person to be classified into a prognostic staging group;

AJCC Prognostic Stage Groups

When T is...	And N is...	And M is...	Then the stage group is...
Tis	N0	M0	0
T1	N0	M0	I
T2	N0	M0	II
T3	N0	M0	III
T1,T2,T3	N1	M0	III
T4a	N0,N1	M0	IVA
T1,T2,T3,T4a	N2	M0	IVA
Any T	N3	M0	IVB
T4b	Any N	M0	IVB
Any T	Any N	M1	IVC

Screening

The US Preventive Services Task Force (USPSTF) in 2013 stated evidence was insufficient to determine the balance of benefits and harms of screening for oral cancer in adults without symptoms by primary care providers. The American Academy of Family Physicians comes to similar conclusions while the American Cancer Society recommends that adults over 20 years who have periodic health examinations should have the oral cavity examined for cancer. The American Dental Association recommends that providers remain alert for signs of cancer during routine examinations.

There are a variety of screening devices such as toluidine blue, brush biopsy, or fluorescence imaging, however, there is no evidence that routine use of these devices in general dental practice is helpful. Potential risks of using screening devices include false positives, unnecessary surgical biopsies, and a financial burden. Micronuclei assays can help in early detection of pre-malignant and malignant lesions, thereby improving survival and reducing morbidity associated with treatment.

There has also been research showing potential in using oral cytology as a diagnostic test for oral cancer instead of traditional biopsy techniques. In oral cytology, a brush is used to take some cells from the suspected lesion/area and these are sent to a laboratory for examination. This can be much less invasive and painful than a scalpel biopsy for the patient, however, there needs to be further research before oral cytology can be considered as an effective routine screening tool when compared to biopsies.

Management

Post-operative image after removal of oral cancer with part of the mandible (feeding tube in nose)

Oral cancer (squamous cell carcinoma) is usually treated with surgery alone, or in combination with adjunctive therapy, including radiation, with or without chemotherapy. With small lesions (T1), surgery or radiation have similar control rates, so the decision about which to use is based on functional outcome, and complication rates.

Surgery

In most centres, removal of squamous cell carcinoma from the oral cavity and neck is achieved primarily through surgery. This also allows a detailed examination of the tissue for histopathologic characteristics, such as depth, and spread to lymph nodes that might require radiation or chemotherapy. For small lesions (T1–2), access to the oral cavity is through the mouth. When the lesion is larger, involves the bone of the maxilla or mandible, or access is limited due to mouth opening, the upper or lower lip is split, and the cheek pulled back to give greater access to the mouth. When the tumor involves the jaw bone, or when surgery or radiation will cause severe limited mouth opening, part of the bone is also removed with the tumor.

Management of the neck

Common scar line after cervical lymph node dissection

Spread of cancer from the oral cavity to the lymph nodes of the neck has a significant effect on survival. Between 60 and 70% of people with early stage oral cancer will have no lymph node involvement of the neck clinically, but 20–30% of those people (or up to 20% of all those affected) will have clinically undetectable spread of cancer to the lymph nodes of the neck (called occult disease).

The management of the neck is crucial, since spread to it reduces the chance of survival by 50%. If there is evidence of lymph node involvement of the neck, during the diagnostic phase, then a modified radical neck dissection is generally performed. Where the neck lymph nodes have no evidence of involvement clinically, but the oral cavity lesion is high risk for spread (e.g. T2 or above lesions), then a neck dissection of the lymph nodes above the level of the omohyoid muscle may be completed. T1 lesions that are 4 mm or greater in thickness have a significant risk of spread to neck nodes. When disease if found in the nodes after removal (but not seen clinically) the recurrence rates is 10–24%. If post-operative radiation is added, the failure rate is 0–15%. When lymph nodes are clinically found during the diagnosis phase, and radiation is added post-operative, disease control is >80%.

Radiotherapy and chemotherapy

Radiation treatment

Chemotherapy and radiotherapy are most often used, as an adjunct to surgery, to control oral cancer that is greater than stage 1, or has spread to either regional lymph nodes or other parts of the body. Radiotherapy alone can be used instead of surgery, for very small lesions, but is generally used as an adjunct when lesions are large, cannot be completely removed, or have spread to the lymph nodes of the neck. Chemotherapy is useful in oral cancers when used in combination with other treatment modalities such as radiation therapy but it is not used alone as a monotherapy. When a cure is unlikely, it can also be used to extend life and can be considered palliative but not curative care.

Monoclonal antibody therapy (with agents such as cetuximab) have been shown to be effective in the treatment of squamous cell head and neck cancers, and are likely to have an increasing role in the future management of this condition when used in conjunction with other established treatment modalities, although it is not a replacement for chemotherapy in head and neck cancers. Likewise, molecularly targeted therapies and immunotherapies may be effective for the treatment of oral and oropharyngeal cancers. Adding epidermal growth factor receptor monoclonal antibody (EGFR mAb) to standard treatment may increase survival, keeping the cancer limited to that area of the body and may decrease reappearance of the cancer.

Rehabilitation

Following treatment, rehabilitation may be necessary to improve movement, chewing, swallowing, and speech. Speech and language pathologists may be involved at this stage. Treatment of oral cancer will usually be by a multidisciplinary team, with treatment professionals from the realms of radiation, surgery, chemotherapy, nutrition, dentistry, and even psychology all possibly involved with diagnosis, treatment, rehabilitation, and care. Due to the location of oral cancer, there may be a period where the person requires a tracheotomy and feeding tube.

Prognosis

Survival rates for oral cancer depend on the precise site and the stage of the cancer at diagnosis. Overall, 2011 data from the SEER database shows that survival is around 57% at five years when all stages of initial diagnosis, all genders, all ethnicities, all age groups, and all treatment modalities are considered. Survival rates for stage 1 cancers are approximately 90%, hence the emphasis on early detection to increase survival outcome for people. Similar survival rates are reported from other countries, such as Germany.

Epidemiology

Deaths from mouth and oropharynx cancers per million people in 2012

  0–8

  9–11

  12–15

  16–18

  19–24

  25–31

  32–40

  41–55

  56–75

  76–156

Globally, it newly occurred in about 355,000 people and resulted in 177,000 deaths in 2018. Of these 355,000, about 246,000 are males and 108,000 are females.

In 2013, oral cancer resulted in 135,000 deaths, up from 84,000 deaths in 1990. Oral cancer occurs more often in people from lower and middle income countries.

Europe

Europe places second-highest after Southeast Asia among all continents for age-standardised rate (ASR) specific to oral and oropharyngeal cancer. It is estimated that there were 61,400 cases of oral and lip cancer within Europe in 2012. Hungary recorded the highest number of mortality and morbidity due to oral and pharyngeal cancer among all European countries while Cyprus reported the lowest numbers 

United Kingdom

British Cancer Research found 2,386 deaths due to oral cancer in 2014; while most oral cancer cases are diagnosed in older adults between 50 and 74 years old, this condition can affect the young as well; 6% of people affected by oral cancer are under 45 years of age. The United Kingdom is 16th-lowest for males and 11th-highest for females for oral cancer incidence among Europe. Additionally, there is a regional variability within the United Kingdom, with Scotland and northern England having higher rates than southern England. The same analysis applies to lifetime risk of developing oral cancer, as in Scotland it is 1.84% in males and 0.74% in females, higher than the rest of the UK, being 1.06% and 0.48%, respectively.

Oral cancer is the sixteenth most-common cancer in the United Kingdom (around 6,800 people were diagnosed with oral cancer in the United Kingdom in 2011), and it is the 19th most-common cause of cancer death (around 2,100 people died from the disease in 2012).

Northern Europe

The highest incidence of oral and pharyngeal cancer was recorded in Denmark, with age-standardised rates per 100,000 of 13.0, followed by Lithuania (9.9) and the United Kingdom (9.8). Lithuania reported the highest incidence in men while Denmark reported the highest in women. The highest rates for mortality in 2012 were reported in Lithuania (7.5), Estonia (6.0), and Latvia (5.4). Incidence of oral cancer in young adults (ages 20–39 years old) in Scandinavia has reportedly risen approximately 6-fold between 1960 and 1994 The high incidence rate of oral and pharyngeal cancer in Denmark could be attributed to their higher alcohol intake than citizens of other Scandinavian countries and low intake of fruits and vegetables in general.

Eastern Europe

Hungary (23.3), Slovakia (16.4), and Romania (15.5) reported the highest incidences of oral and pharyngeal cancer. Hungary also recorded the highest incidence in both genders as well as the highest mortality rates in Europe. It is ranked third globally for cancer mortality rates. Cigarette smoking, excessive alcohol consumption, inequalities in the care received by people with cancer, and gender-specific systemic risk factors have been determined as the leading causes for the high morbidity and mortality rates in Hungary.

Western Europe

The incidence rates of oral cancer in western Europe found France, Germany and Belgium to be highest. The ASRs (per 100,000) were 15.0, 14.6, and 14.1, respectively. When filtered by gender category, the same countries rank top 3 for male, however, in different order of Belgium (21.9), Germany (23.1), and France (23.1). France, Belgium, and the Netherlands rank highest for females, with ASRs 7.6, 7.0, and 7.0, respectively.

Southern Europe

Incidence of oral and oropharyngeal cancers were recorded, finding Portugal, Croatia and Serbia to have highest rates (ASR per 100,000). These values are 15.4, 12, and 11.7, respectively.

United States

In 2022, close to 54,000 Americans are projected to be diagnosed with oral or oropharyngeal cancer. 66% of the time, these will be found as late stage three and four disease. It will cause over 8,000 deaths. Of those newly diagnosed, only slightly more than half will be alive in five years. Similar survival estimates are reported from other countries. For example, five-year relative survival for oral cavity cancer in Germany is about 55%. In the US oral cancer accounts for about 8 percent of all malignant growths.

Oral cancers overall risk higher in black males opposed to white males, however specific oral cancers-such as of the lip, have a higher risk in white males opposed to black males. Overall, rates of oral cancer between gender groups (male and female) seem to be decreasing, according to data from 3 studies.

Of all the cancers, oral cancer attributes to 3% in males, opposed to 2% in women. New cases of oral cancer in US as of 2013, approximated almost 66,000 with almost 14000 attributed from tongue cancer, and nearly 12000 from the mouth, and the remainder from the oral cavity and pharynx. In the previous year, 1.6% of lip and oral cavity cancers were diagnosed, where the age-standardised incidence rate (ASIR) across all geographic regions of United States of America estimates at 5.2 per 100,000 population. It is the eleventh-most-common cancer in the United States among males while in Canada and Mexico it is the twelfth and thirteenth-most-common cancer respectively. The ASIR for lip and oral cavity cancer among men in Canada and Mexico is 4.2 and 3.1, respectively.

South America

The ASIR across all geographic regions of South America as of 2012 sits at 3.8 per 100,000 population where approximately 6,046 deaths have occurred due to lip and oral cavity cancer, where the age-standardized mortality rate remains at 1.4.

In Brazil, however, lip and oral cavity cancer is the 7th most common cancer, with an estimated 6,930 new cases diagnosed in the year 2012. This number is rising and has an overall higher ASIR at 7.2 per 100,000 population whereby an approx 3000 deaths have occurred

Rates are increasing across both males and females. As of 2017, almost 50000 new cases of oropharyngeal cancers will be diagnosed, with incidence rates being more than twice as high in men than women.

Asia

Oral cancer is one of the most-common types of cancer in Asia due to its association with smoking (tobacco, bidi), betel quid and alcohol consumption. Regionally incidence varies with highest rates in South Asia, particularly India, Bangladesh, Sri Lanka, Pakistan, and Afghanistan. In South East Asia and Arab countries, although the prevalence is not as high, estimated incidences of oral cancer ranged from 1.6 to 8.6/ 100,000 and 1.8 to 2.13/ 100,000 respectively. According to GLOBOCAN 2012, the estimated age-standardised rates of cancer incidence and mortality was higher in males than females. However, in some areas, specifically South East Asia, similar rates were recorded for both genders. The average age of those diagnosed with oral squamous cell carcinoma is approximately 51–55. In 2012, there were 97,400 deaths recorded due to oral cancer.

India

Oral cancer is the third-most-common form of cancer in India with over 77 000 new cases diagnosed in 2012 (2.3:1 male to female ratio). Studies estimate over five deaths per hour. One of the reasons behind such high incidence might be popularity of betel and areca nuts, which are considered to be risk factors for development of oral cavity cancers.

Africa

There is limited data for the prevalence of oral cancer in Africa. The following rates describe the number of new cases (for incidence rates) or deaths (for mortality rates) per 100 000 individuals per year.

The incidence rate of oral cancer is 2.6 for both sexes. The rate is higher in males at 3.3 and lower in females at 2.0.

The mortality rate is lower than the incidence rate at 1.6 for both sexes. The rate is again higher for males at 2.1 and lower for females at 1.3.

Australia

The following rates describe the number of new cases or deaths per 100 000 individuals per year. The incidence rate of oral cancer is 6.3 for both sexes; this is higher in males at 6.8–8.8 and lower in females at 3.7–3.9. The mortality rate is significantly lower than the incidence rate at 1.0 for both sexes. The rate is higher in males at 1.4 and lower in females at 0.6. Table 1 provides age-standardised incidence and mortality rates for oral cancer based on the location in the mouth. The location 'other mouth' refers to the buccal mucosa, the vestibule and other unspecified parts of the mouth. The data suggests lip cancer has the highest incidence rate while gingival cancer has the lowest rate overall. In terms of mortality rates, oropharyngeal cancer has the highest rate in males and tongue cancer has the highest rate in females. Lip, palatal and gingival cancer have the lowest mortality rates overall.

Table 1: Age-standardised incidence and mortality rates of oral cancer (per 100 000 individuals per year) in Australia between 1982 and 2008. Adapted from Farah, Simanovic and Dost (2014) .

Location	Incidence per 100 000 individuals per year			Mortality per 100 000 individuals per year
	Both sexes	Males	Females	Both sexes	Males	Females
Lip	5.3	8.4	2.4	0.1	0.1	0.0
Tongue	2.4	3.3	1.4	0.7	1.1	0.4
Gingivae	0.3	0.4	0.3	0.1	0.1	0.0
Floor of mouth	0.9	1.4	0.5	0.2	0.3	0.1
Palate	0.6	0.7	0.4	0.1	0.2	0.1
Other Mouth	0.7	0.8	0.6	0.2	0.2	0.1
Major salivary glands	1.2	1.6	0.9	0.3	0.4	0.2
Oropharynx	1.9	3.0	0.8	0.7	1.2	0.3

Other animals

A beagle with oral cancer.

Oral cancers are the fourth most common type seen in other animals in veterinary medicine, with older animals having higher chances of developing it.

Dogs that are a breed that is at higher risk of developing oral cancer are more susceptible. Tumors that are found early in development can be removed by surgery, however some cases involve removing a part of the jaw. Chemotherapy is used following surgeries or to remove a tumor that cannot be accessed. Tumors that are caught when the cancer has already spread to other places of the body will result in the dog living for only 6-12 more months.

The most common type of oral cancer seen in cats is squamous cell carcinoma. Due to tumors developing in hidden spots such as beneath the tongue, when the tumors in the cats mouth are caught it is often untreatable. Risk factors include secondhand smoke, as the smoke settles on the fur which is ingested when cats groom, and potentially the over consumption of canned food and use of flea collars.

External links

• A digital manual for the early diagnosis of oral neoplasia (IARC Screening Group)