Oral Squamous Cell Carcinoma: Symptoms, Causes and Treatments

Written by Medicover Team and Medically Reviewed by Dr Neelesh Kanderi , Oncologists

Oral squamous cell carcinoma (OSCC) represents a significant health concern globally, due to its potential for aggressive growth and metastasis. It primarily originates in the squamous cells lining the oral cavity and oropharynx.

Stages of Oral Squamous Cell Carcinoma

The staging of OSCC follows the TNM classification system, which considers the size of the tumor (T), involvement of regional lymph nodes (N), and presence of distant metastasis (M). Early-stage OSCC (stage I and II) is confined to the primary site, while advanced stages (stage III and IV) indicate regional or distant spread.

What Are the Symptoms of Oral Squamous Cell Carcinoma?

Symptoms of oral squamous cell carcinoma include persistent mouth ulcers, red or white patches, unexplained bleeding, pain, numbness, difficulty chewing or swallowing, voice changes, loose teeth, neck swelling, and unexplained weight loss. Persistent oral changes should never be ignored.

Early Symptoms

Early detection of OSCC significantly improves treatment outcomes. Initial symptoms may include persistent ulcers or sores in the mouth that do not heal, red or white patches on the gums, tongue, or lining of the mouth, and unusual bleeding or numbness in the oral region.

Advanced Symptoms

As the disease progresses, symptoms may become more pronounced and include difficulty swallowing, persistent sore throat, changes in voice, and noticeable weight loss. Enlarged lymph nodes in the neck may also be present, indicating possible metastasis.

What Causes Oral Squamous Cell Carcinoma?

Oral squamous cell carcinoma develops due to genetic mutations and long-term exposure to cancer-causing factors. Tobacco use, excessive alcohol consumption, high-risk HPV infection, and inherited genetic changes are among the leading causes that increase the risk of this oral cancer.

Genetic Predisposition

Genetic factors play a pivotal role in the etiology of OSCC. Mutations in genes such as TP53, which is crucial for cell cycle regulation, have been implicated in the pathogenesis of this carcinoma. These genetic alterations can lead to uncontrolled cellular proliferation and tumor development.

Lifestyle Factors

Lifestyle choices significantly contribute to the risk of developing oral squamous cell carcinoma. Tobacco use, in both smoking and smokeless forms, is one of the most potent risk factors. Tobacco contains carcinogenic compounds that can induce mutations in the DNA of oral epithelial cells. Similarly, excessive alcohol consumption has been shown to synergistically increase the risk, especially when combined with tobacco use.

Human Papillomavirus (HPV) Infection

HPV, particularly the high-risk strains such as HPV-16, has been identified as a causative agent in a subset of OSCC cases. The virus integrates its DNA into the host cells, disrupting normal cellular processes and leading to malignant transformation.

When Should You See a Doctor for Oral Squamous Cell Carcinoma?

Consult an oncologist if symptoms affect daily life, persist, or worsen over time.

Early diagnosis helps prevent complications and improve outcomes.

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How Is Oral Squamous Cell Carcinoma Diagnosed?

Doctors diagnose oral squamous cell carcinoma through a detailed oral examination, followed by a biopsy to confirm cancer. Imaging tests such as CT scans, MRI, or PET scans help determine the size of the tumor, lymph node involvement, and whether the cancer has spread.

Clinical Examination

A thorough clinical examination by a healthcare professional is the first step in diagnosing OSCC. This includes a visual inspection of the oral cavity and palpation of any suspicious lesions.

Biopsy and Histopathological Analysis

A biopsy is essential for definitive diagnosis. Tissue samples from the lesion are examined histologically to identify malignant squamous cells. Histopathological analysis provides critical information about the tumor's differentiation and invasiveness.

Imaging Techniques

Advanced imaging techniques, such as MRI and CT scans, are employed to assess the extent of the tumor and detect any potential metastases. These modalities help in staging the cancer and planning appropriate treatment strategies.

What Are the Treatment Options for Oral Squamous Cell Carcinoma?

Treatment depends on the stage and location of the cancer. Surgery is often the primary treatment, while radiation therapy, chemotherapy, targeted therapy, or a combination of these approaches may be recommended to remove the tumor and reduce the risk of recurrence.

Surgical Interventions

Surgery is often the primary treatment modality for OSCC, particularly in early stages. The goal is to completely excise the tumor with clear margins to reduce the risk of recurrence. Depending on the tumor's location and size, reconstructive surgery may be required to restore function and appearance.

Radiation Therapy

Radiation therapy is a crucial component of OSCC management, either as a primary treatment or adjuvant therapy post-surgery. It involves the use of high-energy beams to destroy cancer cells, shrink tumors, and alleviate symptoms such as pain and dysphagia.

Chemotherapy

Chemotherapy, often in combination with radiation therapy, is used in advanced stages of OSCC or when surgical options are limited. It involves systemic administration of cytotoxic drugs to target rapidly dividing cancer cells, but it also affects normal cells, leading to side effects.

Targeted Therapy

Targeted therapy offers a more precise approach by interfering with specific molecules involved in tumor growth and progression. Cetuximab, an epidermal growth factor receptor (EGFR) inhibitor, is an example of targeted therapy used in OSCC treatment.

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What Are the Risk Factors for Oral Squamous Cell Carcinoma?

The major risk factors include tobacco use, excessive alcohol consumption, HPV infection, older age, male gender, poor nutrition, occupational exposure to harmful chemicals, and genetic susceptibility. Reducing these risks can help lower the likelihood of developing oral cancer.

Demographic Factors

Age and gender are notable risk factors, with a higher incidence observed in individuals over 50 years of age and a greater prevalence in males compared to females. This disparity may be attributed to higher rates of tobacco and alcohol use among men.

Occupational Hazards

Exposure to certain occupational hazards, such as asbestos and certain chemicals, can increase the risk of OSCC. Individuals working in industries such as construction, textile, and chemicals may be at heightened risk.

Dietary Influences

Dietary deficiencies, particularly in vitamins A, C, and E, have been associated with an increased risk of OSCC. These vitamins play a role in maintaining epithelial integrity and protecting against oxidative stress, which can lead to cellular damage.