Esophageal cancer is a malignant tumor that occurs in the esophagus — the tube connecting the throat to the stomach. It is mainly divided into two types: squamous cell carcinoma (more common in Asia, often linked to smoking and alcohol) and adenocarcinoma (more common in the West, associated with acid reflux and obesity).
The esophagus is the passageway for food. As a tumor grows, it directly affects eating. Patients often seek medical help only when difficulty swallowing appears, by which time it is usually no longer early-stage. Understanding risk factors and paying attention to swallowing abnormalities is key to fighting esophageal cancer.
Causes and Risk Factors
The main risk factors for squamous cell carcinoma are smoking and alcohol; when both are present, the risk multiplies. Frequently eating very hot or pickled foods is also linked. Adenocarcinoma is closely associated with long-term acid reflux (gastroesophageal reflux), Barrett's esophagus (a precancerous condition caused by acid reflux), and obesity.
Other risk factors include: increasing age (most common over 60), being male, previous chest radiation therapy, and esophageal conditions such as achalasia. Patients with long-term acid reflux should take reflux seriously and, if necessary, undergo endoscopic surveillance as advised by their doctor.
Common Symptoms and Warning Signs
The most typical warning sign is progressive difficulty swallowing: at first, only solid foods (such as meat or bread) feel stuck, but gradually even soft foods or liquids become hard to swallow. Other symptoms include: painful swallowing, food regurgitation, pain or burning behind the breastbone, hoarseness, and persistent cough.
Because eating is difficult, patients often lose weight noticeably in a short time. Unexplained weight loss combined with swallowing problems is a combination that requires immediate investigation. Early esophageal cancer has almost no symptoms. High-risk individuals with concerns can proactively discuss endoscopic examination with their doctor.
Diagnosis and Staging
Upper endoscopy (esophagogastroduodenoscopy) is the main method for diagnosing esophageal cancer. It allows direct visualization of the esophageal lining and tissue biopsy. A barium swallow study can show the location and degree of esophageal narrowing and is a commonly used supplementary test.
After diagnosis, CT scans, PET-CT, and endoscopic ultrasound (EUS) are used to assess the depth of invasion and metastasis. Staging ranges from stage I (confined to the esophageal wall) to stage IV (distant metastasis). Staging determines the treatment approach: early-stage disease is primarily treated with surgery, while locally advanced disease often uses a combined approach of chemoradiotherapy plus surgery.
Overview of Treatment Options
For resectable esophageal cancer, the standard strategy is preoperative chemoradiotherapy (concurrent chemotherapy and radiation) to shrink the tumor, followed by esophagectomy. The surgery is complex and requires reconstruction of the digestive tract, so it should be performed at an experienced center. In some patients, the tumor completely disappears after chemoradiotherapy, and a strategy of close monitoring instead of immediate surgery can be discussed with the doctor.
Drug treatment for advanced esophageal cancer has made significant progress in recent years: chemotherapy remains the foundation, and immunotherapy (PD-1 inhibitors) combined with chemotherapy has become one of the first-line standards for advanced squamous cell carcinoma; HER2-positive adenocarcinoma may benefit from adding anti-HER2 targeted therapy. When difficulty swallowing is severe, an esophageal stent can be placed first to improve eating.
Clinical Trials: One More Treatment Option
Research on immunotherapy and new targeted drugs in esophageal cancer is very active, with trials ongoing from first-line combinations to postoperative consolidation.
The CancerLink platform can screen for esophageal cancer clinical studies recruiting in Hong Kong based on cancer type, stage, and genetic mutations. After successful matching and enrollment, all study-related treatment costs are covered. To find out if there is a suitable trial, please visit the study recruitment page or submit a matching application.
Difficulty swallowing is not a minor issue, especially when symptoms gradually worsen — please seek medical attention as soon as possible. After a diagnosis of esophageal cancer, nutritional support is as important as treatment — maintaining strength will help you complete treatment better.