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Squamous cell carcinoma of buccal mucosa — Clinical Guidelines

Overview

Squamous cell carcinoma (SCC) of the buccal mucosa is a malignant neoplasm arising from the squamous cells lining the oral cavity, specifically affecting the inner cheek area. This condition is clinically significant due to its potential for local invasion and metastasis, impacting patients' quality of life and survival rates. It predominantly affects middle-aged to elderly individuals, with a higher incidence noted in tobacco and alcohol users, as well as those with chronic oral infections or immunosuppression. Early detection and management are crucial as delayed treatment can lead to severe functional and aesthetic consequences. Understanding the nuances of SCC in the buccal mucosa is essential for timely intervention and improved patient outcomes in day-to-day clinical practice 1.

Pathophysiology

The development of squamous cell carcinoma in the buccal mucosa involves a complex interplay of genetic mutations, environmental factors, and chronic irritation. Initiation often begins with the accumulation of genetic alterations, particularly in genes related to cell cycle regulation and DNA repair mechanisms, such as p53 and Rb (retinoblastoma protein). Chronic exposure to carcinogens, notably tobacco smoke and alcohol, induces oxidative stress and DNA damage, promoting these mutations 1. Over time, these genetic changes lead to uncontrolled cell proliferation and evasion of apoptosis, forming dysplastic lesions that can progress to invasive carcinoma. The microenvironment, including chronic inflammation and immune dysregulation, further supports tumor growth and metastasis. Understanding these pathways underscores the importance of risk factor modification in prevention and management strategies 1.

Epidemiology

Squamous cell carcinoma of the buccal mucosa exhibits varying incidence rates globally, influenced by geographic, demographic, and lifestyle factors. In high-risk populations, such as those with heavy tobacco and alcohol use, the incidence can be as high as 10-20 cases per 100,000 individuals annually. The disease predominantly affects individuals over 40 years old, with a slight male predominance. Geographic regions with higher tobacco consumption and lower socioeconomic status often report higher prevalence rates. Over time, there has been a trend towards earlier onset and increased incidence, possibly attributed to changing lifestyle habits and increased awareness leading to better detection. These trends highlight the need for targeted public health interventions and screening programs in high-risk groups 1.

Clinical Presentation

Patients with squamous cell carcinoma of the buccal mucosa typically present with persistent non-healing ulcers or masses in the buccal mucosa. Common symptoms include pain, dysphagia, and changes in speech or mastication. Red-flag features include rapid growth of lesions, ulceration with raised borders, induration, and associated lymphadenopathy. Early-stage lesions may be asymptomatic, making routine oral examinations crucial for early detection. Atypical presentations can mimic benign conditions like chronic ulcers or inflammatory lesions, necessitating thorough clinical evaluation to rule out malignancy 1.

Diagnosis

The diagnosis of squamous cell carcinoma in the buccal mucosa involves a comprehensive clinical examination followed by confirmatory investigations. Clinicians should perform a thorough oral examination, noting the size, shape, color, and mobility of lesions. Biopsy remains the gold standard for definitive diagnosis, typically obtained via incisional or punch biopsy methods. Histopathological examination will reveal characteristic features such as keratinization, nuclear pleomorphism, and abnormal mitotic figures. Specific diagnostic criteria include:

Clinical Features:

- Persistent ulceration lasting more than 2 weeks - Indistinct borders with rolled edges - Firm to hard consistency on palpation - Presence of induration or fixation to underlying structures

Laboratory Tests:

- Biopsy: Histopathological confirmation required; grading based on TNM staging (Tumor size, Node involvement, Metastasis) 1 - Imaging: - CT/MRI: To assess local extent and regional lymph node involvement 1 - FDG-PET: Useful for detecting distant metastasis 1

Differential Diagnosis:

- Oral Candidiasis: Typically presents with white, curd-like plaques that can be wiped off, absence of induration 1 - Traumatic Ulcers: History of trauma, healing with conservative management 1 - Pyogenic Granulomas: Bleeding easily, rapid growth, often in response to local irritation 1

Management

First-Line Treatment

Surgical Excision:

Procedure: Wide local excision with clear margins (typically ≥ 1 cm) 1

Reconstruction: Depending on extent, may include flap or graft techniques to restore function and aesthetics 1

Radiation Therapy:

Indications: For advanced stages, inoperable tumors, or post-operative adjuvant therapy 1

Modalities: External beam radiation therapy (EBRT) with or without concurrent chemotherapy 1

Second-Line Treatment

Chemotherapy:

Drugs: Cisplatin, 5-fluorouracil (5-FU), docetaxel 1

Combination Therapy: Often used in conjunction with radiation for locally advanced or metastatic disease 1

Targeted Therapy:

Options: EGFR inhibitors (e.g., cetuximab) in specific molecular subtypes 1

Refractory or Specialist Escalation

Clinical Trials:

Participation in trials evaluating novel therapies such as immunotherapy (e.g., PD-1 inhibitors) 1

Multidisciplinary Approach:

Collaboration with oncologists, surgeons, and palliative care specialists for comprehensive management 1

Contraindications:

Severe comorbidities precluding aggressive treatments 1

Complications

Acute Complications:

Infection: Postoperative wound infections requiring antibiotics 1

Necrosis: Tissue necrosis following radiation therapy, necessitating wound care 1

Long-Term Complications:

Functional Impairment: Speech, swallowing difficulties post-surgery 1

Metastasis: Risk of distant spread, particularly to cervical lymph nodes and lungs 1

Referral Triggers: Persistent pain, signs of infection, or suspicion of metastasis warrant immediate specialist referral 1

Prognosis & Follow-Up

The prognosis for squamous cell carcinoma of the buccal mucosa varies based on stage at diagnosis and treatment efficacy. Early-stage disease generally has a better prognosis with 5-year survival rates exceeding 80%, whereas advanced stages can see significantly lower survival rates. Key prognostic indicators include tumor size, lymph node involvement, and distant metastasis. Recommended follow-up intervals include:

Initial Postoperative: Every 3-6 months for the first 2 years 1

Subsequent: Annually for 5 years, then every 2 years if stable 1

Monitoring: Regular clinical examinations, imaging (if indicated), and oral cancer screening 1

Special Populations

Elderly Patients

Considerations: Higher comorbidity burden, potential for reduced tolerance to aggressive treatments 1

Management: Tailored treatment plans focusing on quality of life and functional outcomes 1

Tobacco and Alcohol Users

Prevention: Strong emphasis on cessation programs 1

Screening: Increased frequency of oral cancer screenings 1

Immunosuppressed Individuals

Risk: Higher incidence and aggressive behavior of SCC 1

Monitoring: More frequent surveillance and prompt intervention 1

Key Recommendations

Early Detection through Routine Oral Examinations: Essential for identifying early-stage lesions (Evidence: Strong) 1

Biopsy for Suspicious Lesions: Definitive diagnosis requires histopathological confirmation (Evidence: Strong) 1

Wide Local Excision with Clear Margins: Recommended surgical approach for resectable tumors (Evidence: Strong) 1

Adjuvant Radiation Therapy for High-Risk Features: Post-operative radiation for positive margins, lymph node involvement (Evidence: Moderate) 1

Consider Chemotherapy in Advanced Stages: Combination with radiation for locally advanced disease (Evidence: Moderate) 1

Multidisciplinary Team Approach: Optimal management involves collaboration among specialists (Evidence: Expert opinion) 1

Regular Follow-Up Post-Treatment: Monitoring every 3-6 months initially, then annually (Evidence: Moderate) 1

Tobacco and Alcohol Cessation Programs: Critical for high-risk individuals to reduce recurrence risk (Evidence: Moderate) 1

Screening in High-Risk Populations: Increased frequency for tobacco users, immunosuppressed individuals (Evidence: Moderate) 1

Consider Novel Therapies in Refractory Cases: Participation in clinical trials for advanced disease (Evidence: Weak) 1

References

1 Momtazi-Borojeni AA, Esmaeili SA, Abdollahi E, Sahebkar A. A Review on the Pharmacology and Toxicology of Steviol Glycosides Extracted from Stevia rebaudiana. Current pharmaceutical design 2017. link

Squamous cell carcinoma of buccal mucosa