According to GLOBOCAN 2020, oral cancer represents approximately 30% of all cancers in India, with an estimated 135,000 new cases every year, one of the highest rates globally. Understanding why this happens in India highlights the importance of early detection and specialized treatment.
Why India Has One of the World's Highest Oral Cancer Burdens
India contributes to almost one-third of all oral cancer cases worldwide.
- Tobacco and Betel Nut Use
India has over 267 million tobacco users, consuming products like gutka, khaini, zarda, and betel quid with tobacco. These substances are often kept in the mouth for long periods, exposing the oral lining to cancer-causing chemicals.
A large study in The Lancet Oncology found that chewing tobacco with betel quid increased oral cancer risk nearly eightfold. The WHO classifies betel quid with tobacco as a definite human carcinogen.
- Late Diagnosis
Around 60–70% of oral cancer patients in India are diagnosed at Stage III or IV, much higher than in many other countries. Reasons include delayed specialist consultation, limited health literacy, and distance from tertiary care centers. Later diagnosis complicates treatment and lowers survival rates.
- Genetic Factors
Emerging research suggests tobacco-related oral cancers in Indian patients have different genetic characteristics compared to HPV-related throat cancers more common in the West, influencing treatment strategies.
Regional Variation
Oral cancer rates vary across India:
Western and Central India (Gujarat, Madhya Pradesh) – highest rates among men due to gutka and betel quid chewing.
Northeastern states (Meghalaya) – highest rates among women.
Kerala – lower rates due to comparatively low smokeless tobacco use.
Chennai serves as a major referral center for patients from across Tamil Nadu, West Bengal, Assam, and even Bangladesh due to experienced surgical teams, advanced reconstruction capabilities, and comprehensive support services.
Where Oral Cancer Develops: Anatomic Sites
The location of the cancer in the mouth impacts symptoms, spread, surgical needs, and prognosis.
Buccal mucosa (inner cheek) – most common in Indian patients (40–50%), linked to holding tobacco/betel quid against the cheek. Presents as non-healing sores or growths.
Tongue – often caught earlier due to changes in speech or swallowing. More likely to spread to neck lymph nodes.
Floor of mouth – difficult to spot initially; may invade jawbone or tongue musculature.
Gingivobuccal sulcus – groove where cheek meets gum, associated with tobacco placement.
Other sites – hard palate, upper and lower alveolus, retromolar trigone.
Types of Oral Cancer
Oral Squamous Cell Carcinoma (OSCC) – 90–95% of oral cancers; classified as well, moderately, or poorly differentiated.
Verrucous carcinoma – slow-growing, warty, rarely spreads; responds well to surgery.
Minor salivary gland cancers – include mucoepidermoid carcinoma and adenoid cystic carcinoma. Adenoid cystic can spread along nerves over years.
Oral melanoma – rare, more common in Indian/Asian patients; often appears on the palate or upper gum; poor prognosis.
Accurate biopsy and pathology are essential as treatment varies significantly by type.
Warning Signs: When to See a Doctor
Early detection improves survival dramatically:
Stage I: 5-year survival 80–90%
Stage IV: 5-year survival 15–55%
The 3-Week Rule
Any mouth sore or ulcer lasting more than 3 weeks requires evaluation. Harmless ulcers usually heal in 7–14 days.
Concerning features:
- Firm, hard, or raised edges
- Bleeding or necrotic base
- Growing in size despite removing obvious causes
- White and Red Patches
- Leukoplakia – white patch; some may become cancerous.
- Erythroplakia – red patch; 80–90% may contain severe dysplasia or invasive cancer.
Other warning signs:
- Lump/swelling in mouth or neck
- Unexplained tooth loosening
- One-sided ear pain
- Numbness or tingling of lip/chin
- Difficulty opening mouth or swallowing
Screening Recommendations
High-risk individuals (tobacco, betel nut, alcohol) should have visual mouth exams every 6–12 months.
A Kerala clinical trial (Lancet, 2005) showed screening by trained health workers reduced oral cancer deaths by 34% over 15 years.
Immediate specialist visit is warranted for:
- Mouth ulcer >3 weeks
- Any red patch (erythroplakia)
- Non-homogeneous leukoplakia
- Unexplained lumps in mouth/neck
- Progressive swallowing difficulties
- One-sided ear pain
- Loose teeth without gum disease
- Tingling/numbness of lip/chin
- Diagnosis and Staging
- Biopsy
The only definitive way to confirm cancer type and aggressiveness.
Staging (TNM System)
- T (Tumor) – size and depth
- N (Nodes) – lymph node involvement
- M (Metastasis) – distant spread
- Depth of invasion is a critical predictor of lymph node spread and survival.
5-year survival by stage:
Stage I: 80–90%
Stage II: 70–80%
Stage III: 60–70%
Stage IVA: 40–55%
Stage IVB: 15–30%
Imaging (CT, MRI, PET-CT) helps map tumor spread and plan surgery.
Pathology Report: What the Features Mean
Key findings influence treatment and prognosis:
Surgical margins – clear margins reduce recurrence.
Depth of invasion (DOI) – deeper tumors need neck lymph node surgery.
Perineural invasion (PNI) – cancer along nerves; may need radiation.
Lymphovascular invasion (LVI) – cancer in vessels; higher recurrence risk.
Worst pattern of invasion (WPOI-5) – scattered clusters predict recurrence.
Extranodal extension (ENE) – lymph node rupture; requires chemotherapy plus radiation.
Tumor grade – how abnormal cells appear; higher grade = more aggressive.
Surgery: Primary Treatment for Oral Cancer
Surgery is the cornerstone of oral cancer treatment. Goals:
- Complete tumor removal with safe margins
- Management of neck lymph nodes
- Functional reconstruction
- Frozen section analysis may be done during surgery to ensure margins are clear.
Managing the Neck: Lymph Node Surgery
Even when the neck appears normal, microscopic cancer may be present in 20–40% of patients.
Elective neck dissection removes lymph nodes proactively, improving disease-free and overall survival. Indications include:
- Tumor depth >3–4mm
- Poor tumor differentiation
- Lymphovascular or perineural invasion
- Posterior tongue or floor of mouth tumors
Conclusion
Oral cancer remains a significant health challenge in India, driven largely by tobacco and betel nut use, late diagnosis, and regional variations in risk. The good news is that early detection, regular screening,
Awareness is key: recognizing warning signs like persistent sores, red or white patches, lumps, or unusual numbness, and seeking medical attention promptly, can make a life-saving difference. Combined with evidence-based treatment—including surgery, lymph node management, and adjuvant therapies—patients have a far better chance of recovery.
Read more: https://mouthcancersurgeons.com/oral-cancer-screening/