Which risk factors are associated with esophageal squamous cell carcinoma as opposed to adenocarcinoma?

• A. GERD and Barrett's esophagus.
• B. Obesity.
• C. Smoking, alcohol, and irritants.
• D. PPI use.

Answer: (C)

Esophageal squamous cell carcinoma and adenocarcinoma have different origins and risk factor patterns. Squamous cell cancer comes from the squamous lining and is strongly linked to exposure to irritants, especially tobacco and alcohol, as well as other chemical irritants and nutritional factors. This is why smoking, alcohol use, and irritants are classic risk factors for squamous cancers of the esophagus.

In contrast, adenocarcinoma usually arises in the distal esophagus from Barrett’s esophagus, a result of chronic gastroesophageal reflux. Obesity also increases risk for this type by promoting reflux and Barrett’s metaplasia. Medications like proton pump inhibitors are not considered risk factors for esophageal cancers and are more about treating reflux.

So the combination of smoking, alcohol, and irritants aligns with the risk profile for squamous cell carcinoma, while GERD/Barrett’s and obesity point toward adenocarcinoma.