1. Early Symptoms – Easily Overlooked
The most "insidious" aspect of esophageal cancer is that its early symptoms are too easily ignored. In the truly early stages, there are almost no symptoms, or only very mild ones. Some patients may experience: a choking sensation when swallowing solid foods (intermittent, may resolve spontaneously without treatment but recurs); retrosternal discomfort, stabbing or pulling pain, or burning sensation; a foreign body sensation in the esophagus and a feeling of delayed food passage; and dryness or tightness in the throat. These symptoms fluctuate in severity and duration, and may even be completely absent.
2. Intermediate and Advanced Symptoms – Progressive Worsening
Progressive dysphagia is the hallmark symptom of intermediate and advanced esophageal cancer, evolving from an inability to swallow solid foods to eventually being unable to swallow liquids. Additional manifestations may include: persistent chest pain or back pain (indicating tumor invasion beyond the esophagus); food regurgitation; hoarseness (due to recurrent laryngeal nerve involvement); severe coughing on swallowing water or food (esophagotracheal fistula); Horner's syndrome (due to cervical sympathetic ganglion involvement); and dehydration, malnutrition, etc.
Special reminder: The early diagnosis rate for esophageal cancer in China is only approximately 20%. Approximately 93% of patients are already at an intermediate or advanced stage at the time of diagnosis. In contrast, early-stage esophageal cancer treated with endoscopic resection achieves a 5-year survival rate of over 90%–95%, while the 5-year survival rate for advanced-stage patients is less than 30%. Therefore, regular screening is of critical importance.
Auxiliary Examinations – The "Gold Standard" and Core Modalities
1. Esophagogastroduodenoscopy (EGD) – First-line choice: Allows direct visualization of tumor morphology and biopsy for pathological examination, serving as the "gold standard" for qualitative and localization diagnosis of esophageal cancer. Mucosal staining (toluidine blue staining turns cancerous tissue blue; iodine staining turns normal tissue brown-black while pathological mucosa remains unstained) can enhance the detection rate of early-stage esophageal cancer.
2. Barium esophagography: Used for gross morphological classification of intermediate and advanced esophageal cancer, with findings including disappearance or interruption of mucosal folds, luminal narrowing and rigidity, filling defects, and irregular niche defects.
3. CT scan: Used to evaluate lesion location, clinical staging, and the presence of distant metastasis.
4. Esophageal exfoliative cytology via abrasive balloon/string: Positive rate can exceed 90%, representing an important method for large-scale population screening of esophageal cancer.
5. Endoscopic ultrasonography (EUS): Provides clear visualization of the layered structure of the esophageal wall and enables assessment of tumor infiltration depth (T-staging accuracy: 74%–86%), which is of significant value for staging and treatment planning.
Screening recommendations: According to the Guidelines for Esophageal Cancer Screening, Early Detection, and Early Treatment, individuals aged ≥45 years who meet any of the following criteria require regular screening: residents of high-incidence areas for esophageal cancer; those with a first-degree relative with a history of esophageal cancer; long-term smokers or heavy drinkers; or those with premalignant lesions.