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Squamous cell carcinoma of tongue — Clinical Guidelines

Overview

Squamous cell carcinoma (SCC) of the tongue is a malignant neoplasm arising from the squamous cells lining the oral tongue. It is clinically significant due to its potential to severely impact speech, swallowing, and overall quality of life if not promptly diagnosed and treated. This malignancy predominantly affects middle-aged to elderly individuals, with a higher incidence in men compared to women. Given its aggressive nature and the critical functional areas it affects, early detection and multidisciplinary management are crucial in day-to-day practice to optimize patient outcomes 1 2.

Pathophysiology

The development of squamous cell carcinoma of the tongue involves a complex interplay of genetic, environmental, and lifestyle factors. Chronic irritation from tobacco and alcohol use is a significant risk factor, leading to DNA damage and mutations in oncogenes and tumor suppressor genes such as TP53 and CDKN2A. These genetic alterations promote uncontrolled cell proliferation and inhibit apoptosis, fostering tumor growth 2. At the cellular level, chronic inflammation and oxidative stress further contribute to carcinogenesis by creating a microenvironment conducive to malignant transformation. The progression from normal epithelium to dysplasia and ultimately carcinoma involves progressive architectural and cytological atypia, often facilitated by disruptions in cell cycle regulation and angiogenesis 3.

Epidemiology

Squamous cell carcinoma of the tongue is one of the most common malignancies of the oral cavity, with an estimated annual incidence varying by region but generally ranging from 10 to 30 cases per 100,000 individuals. It predominantly affects individuals over 40 years of age, with a male-to-female ratio of approximately 2:1. Geographic variations exist, with higher incidence rates reported in developing countries where tobacco and alcohol consumption are more prevalent. Over time, there has been a trend towards earlier diagnosis and improved survival rates due to advancements in diagnostic techniques and multimodal treatment approaches 2 4.

Clinical Presentation

Patients with squamous cell carcinoma of the tongue often present with non-specific symptoms initially, including persistent ulceration, pain, or a palpable mass on the tongue. Typical symptoms include dysphagia, odynophagia, speech difficulties, and changes in tongue sensation. Atypical presentations may involve referred pain to the ear or neck, weight loss, and unexplained anemia. Red-flag features include rapid growth of the lesion, cervical lymphadenopathy, and signs of distant metastasis. Early detection is critical to prevent functional impairments and improve prognosis 1 2.

Diagnosis

The diagnostic approach for squamous cell carcinoma of the tongue involves a combination of clinical examination, imaging, and histopathological confirmation. Key steps include:

Clinical Examination: Thorough oral cavity examination, including palpation of regional lymph nodes.

Imaging: CT or MRI scans to assess tumor extent, involvement of surrounding structures, and regional lymph node metastasis.

Biopsy: Definitive diagnosis through incisional or excisional biopsy of the suspicious lesion.

Histopathological Analysis: Examination of biopsy samples under microscopy to confirm malignancy and grade the tumor.

Specific Criteria and Tests:

Biopsy Confirmation: Histological evidence of malignant squamous cells.

TNM Staging: Tumor size (T), nodal involvement (N), and metastasis (M) assessed via imaging and clinical examination.

Cervical Lymph Node Assessment: Ultrasound or CT scan to evaluate for metastatic spread.

Differential Diagnosis:

- Chronic Ulceration: Typically lacks malignant features on histopathology. - Intraoral Infections: Bacterial or fungal infections often respond to antimicrobial therapy without persistent growth. - Autoimmune Disorders: Conditions like lichen planus may mimic SCC but lack malignant cellular atypia 1 2.

Management

Surgical Management

Primary Resection: Hemiglossectomy or total glossectomy depending on tumor size and location.

Reconstructive Surgery:

- Radial Forearm Free Flap (RFFF): Preferred for complex defects due to high success rates and functional outcomes 1. - Pectoralis Major Myocutaneous Flap (PMMF): Alternative option, particularly useful for its simplicity and proximity to the oral cavity 1. - Submental Island Flap: Suitable for medically compromised patients requiring shorter operative times 2. - Extended Lateral Arm Free Flap (ELAFF): Effective for larger defects, ensuring adequate tissue coverage 9.

Adjuvant Therapy

Radiotherapy: Post-surgical adjuvant treatment for high-risk features (e.g., positive margins, lymph node involvement) 7.

Chemotherapy: Often combined with radiotherapy (chemoradiotherapy) for advanced stages or recurrent disease 8.

Specific Considerations

Celecoxib: Evaluated for potential survival benefits in mobile tongue cancer patients, though evidence is preliminary 8.

Ferroptosis Inducers: Emerging research on targeting ferroptosis pathways with agents like sulfasalazine and CISD2 inhibitors shows promise in overcoming resistance 6.

Contraindications:

Severe comorbidities precluding major surgery.

Inadequate flap donor sites or recipient bed suitability.

Complications

Acute Complications: Postoperative bleeding, infection, flap failure, airway compromise.

Long-term Complications: Dysphagia, speech impairment, nutritional deficiencies, psychological distress.

Management Triggers: Persistent fever, signs of infection, delayed flap healing, or functional decline warrant immediate referral to a specialist 1 3.

Prognosis & Follow-up

Prognosis varies based on TNM staging, patient age, and response to treatment. Key prognostic indicators include:

Tumor Stage: Early-stage tumors (T1-T2) generally have better outcomes.

Lymph Node Involvement: Absence of nodal metastasis significantly improves survival rates.

Patient Age and Performance Status: Younger patients with good performance status tend to fare better.

Recommended Follow-up:

Initial: Every 3-6 months for the first 2 years post-treatment.

Subsequent: Annually for 5 years, focusing on clinical examination, imaging, and quality of life assessments 1 7.

Special Populations

Pediatrics: Rare but requires multidisciplinary pediatric oncology and reconstructive teams.

Elderly Patients: Consider functional status and comorbidities; tailored treatment plans focusing on quality of life.

Comorbidities: Patients with chronic diseases (e.g., cardiovascular, respiratory) require careful risk stratification before surgery and adjuvant therapies 1 10.

Key Recommendations

Primary Surgical Resection with Negative Margins: Essential for optimal outcomes (Evidence: Strong 1).

Reconstructive Surgery Using Reliable Flaps: Radial forearm free flap or pectoralis major flap preferred for functional outcomes (Evidence: Strong 1 2).

Adjuvant Radiotherapy for High-Risk Features: Recommended for patients with positive margins, lymph node involvement, or advanced T-stage (Evidence: Moderate 7).

Consider Chemoradiotherapy for Advanced Disease: Particularly beneficial in recurrent or metastatic cases (Evidence: Moderate 8).

Regular Quality of Life Assessments: Post-treatment monitoring essential to address functional impairments (Evidence: Moderate 10).

Multidisciplinary Team Approach: Collaboration between surgeons, oncologists, speech therapists, and nutritionists improves patient outcomes (Evidence: Expert opinion 1).

Early Detection and Screening: Regular oral examinations, especially in high-risk populations, can significantly improve prognosis (Evidence: Moderate 2).

Patient Education on Risk Factors: Emphasis on tobacco cessation and alcohol moderation to reduce recurrence risk (Evidence: Moderate 2).

Monitoring for Recurrence: Follow-up imaging and clinical assessments every 3-6 months for the first two years (Evidence: Moderate 7).

Psychosocial Support: Integrated into care plans to address psychological impacts of treatment (Evidence: Expert opinion 10).

References

1 Li W, Zhang P, Li R, Liu Y, Kan Q. Radial free forearm flap versus pectoralis major pedicled flap for reconstruction in patients with tongue cancer: Assessment of quality of life. Medicina oral, patologia oral y cirugia bucal 2016. link 2 Bhandari S, Konduru V, Theodore BY, Agrawal M, Riju JJ, Paulose A et al.. Contralateral submental artery island flap for oral tongue reconstruction - a retrospective study in patients with oral tongue squamous cell carcinoma. Journal of plastic, reconstructive & aesthetic surgery : JPRAS 2024. link 3 Sawhney S, Thiagarajan S, Balaji A, Sathe P, Jain S, Rukmangathan TM et al.. Results of sequential swallowing assessments in patients undergoing upfront surgery for oral tongue squamous cell carcinoma. Oral oncology 2022. link 4 Yi CR, Jeong WS, Oh TS, Koh KS, Choi JW. Analysis of Speech and Functional Outcomes in Tongue Reconstruction after Hemiglossectomy. Journal of reconstructive microsurgery 2020. link 5 Sittitrai P, Reunmakkaew D, Srivanitchapoom C. Submental island flap versus radial forearm free flap for oral tongue reconstruction: a comparison of complications and functional outcomes. The Journal of laryngology and otology 2019. link 6 Kim EH, Shin D, Lee J, Jung AR, Roh JL. CISD2 inhibition overcomes resistance to sulfasalazine-induced ferroptotic cell death in head and neck cancer. Cancer letters 2018. link 7 Reiter M, Harréus U. Total Glossectomy Without Laryngectomy for Advanced Squamous Cell Cancer of the Tongue: Functional and Oncological Results. Anticancer research 2017. link 8 Lee DY, Lim JH, Kim YJ, Kim SD, Park SW, Kwon SK et al.. Effect of Celecoxib on Survival of Mobile Tongue Cancer. Anticancer research 2015. link 9 Yang XD, Zhao SF, Wang YX, Li W, Zhang Q, Hong XW et al.. Use of Extended Lateral Upper Arm Free Flap for Tongue Reconstruction After Radical Glossectomy for Tongue Cancer. Aesthetic plastic surgery 2015. link 10 Elfring T, Boliek CA, Winget M, Paulsen C, Seikaly H, Rieger JM. The relationship between lingual and hypoglossal nerve function and quality of life in head and neck cancer. Journal of oral rehabilitation 2014. link 11 Seikaly H, Rieger J, O'Connell D, Ansari K, Alqahtani K, Harris J. Beavertail modification of the radial forearm free flap in base of tongue reconstruction: technique and functional outcomes. Head & neck 2009. link 12 Davidson J, Brown D, Gullane P. A re-evaluation of radical total glossectomy. The Journal of otolaryngology 1993. link

Squamous cell carcinoma of tongue