
Esophageal Cancer
Clinical OncologyGastroenterology Hepatology
Esophageal cancer is a malignant tumor arising from the lining of the esophagus, most often affecting its middle and lower segments. It occurs in two main histological forms: Squamous cell carcinoma and Adenocarcinoma.
Although its overall incidence in Hong Kong is lower than that of stomach or liver cancer, esophageal cancer often presents at an advanced stage because early symptoms are subtle or absent. The hallmark clinical feature is progressive dysphagia (starting with solid foods and later involving liquids), frequently accompanied by unexplained weight loss, retrosternal discomfort, and occasionally hoarseness or chronic cough.
Symptoms
The most common presenting symptom of esophageal cancer is difficulty swallowing. Typically, food becomes lodged partway down the esophagus to the stomach. Liquids may pass without issue at first, but soon become obstructed as well.
- Progressive dysphagia: Initially affects only solid foods, but as the disease advances, even liquids are difficult to swallow.
- Odynophagia (painful swallowing): Often described as food “sticking” or a sharp, “stinging” sensation.
- Acid reflux or coughing: More likely when lying flat due to the accumulation of food above the tumour.
- Hoarseness: Occurs if the tumour invades the recurrent laryngeal nerve.
- Unexplained weight loss and loss of appetite.
- Retrosternal or back discomfort: Sometimes radiating to the shoulders or shoulder blades.
- Chronic cough or aspiration pneumonia may result from a tracheoesophageal fistula.
Early medical evaluation is strongly advised if you experience any of these symptoms.
Causes & Pathological Types
Squamous cell carcinoma (SCC)
- Arises in the upper and mid-esophagus from squamous epithelium.
- Strongly linked to chronic tobacco and alcohol exposure.
Adenocarcinoma
- Occurs mainly in the distal esophagus.
- Often develops from Barrett’s esophagus (intestinal metaplasia) secondary to chronic gastroesophageal reflux.
Other rare types: small-cell carcinoma, sarcoma, lymphoma.

Risk Factors
- Age & Gender: Incidence rises after age 60; male : female ratio ≈ 4 : 1
- Tobacco & Alcohol: Synergistic effect significantly elevates SCC risk
- Barrett’s Esophagus / GERD: Chronic reflux increases adenocarcinoma risk; ~1 % of Barrett’s cases progress yearly.
- Dietary Habits: Frequent consumption of very hot beverages (> 65 °C) irritates mucosa; nitrosamine-rich, smoked, or pickled foods
- Obesity: Central adiposity promotes reflux and adenocarcinoma.
- Family History & Genetic Syndromes: Rare familial clusters.
Staging
TNM Staging
- T (Tumour): Assesses the depth of tumour invasion (mucosa, submucosa, muscularis, etc.)
- N (Node): Evaluates regional lymph node involvement.
- M (Metastasis): Determines whether there are distant organ metastases.
Clinical Staging
Stage I | Tumor limited to mucosa/submucosa (T1), ≤ 2 cm |
Stage II | Invades muscularis propria or up to 2 regional nodes (N1) |
Stage III | Invasion beyond muscle or 3–6 regional nodes (N2) |
Stage IV | Distant metastases (M1) |
Accurate TNM classification (T, N, M) guides prognosis and treatment selection.
Diagnosis
- Endoscopy & Biopsy: Gold standard for visualization and histopathology.
- Barium Swallow (Contrast Radiography): Detects strictures, ulceration, “shouldering” of the lesion.
- CT Scan: Assesses local extent and thoracoabdominal metastases.
- Endoscopic Ultrasound (EUS): Evaluates depth of invasion and nodal involvement.
- PET-CT: Detects occult distant metastases for staging refinement.
- Bronchoscopy: When tracheal involvement or fistula is suspected.
Treatment is multidisciplinary and stage-dependent:
Surgery
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Chemoradiotherapy |
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Palliative Interventions |
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Emerging Therapies |
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FAQ
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