Which risk factors are most strongly associated with squamous cell carcinoma of the esophagus as compared with adenocarcinoma?

• A. Smoking, alcohol, and irritants.
• B. Barrett's esophagus and obesity.
• C. Helicobacter pylori infection.
• D. PPI use.

Answer: (B)

Two main esophageal cancer types have different risk profiles. Squamous cell carcinoma is most strongly linked to exposures that irritate and damage the squamous lining of the esophagus—chiefly tobacco smoking and heavy alcohol use, with other irritants contributing as well. These factors explain why smoking and alcohol are classic risk factors for SCC.

In contrast, adenocarcinoma tends to arise in the distal esophagus in the setting of Barrett’s esophagus, which develops from chronic gastroesophageal reflux, and obesity further increases risk by worsening reflux and inflammation. Barrett’s esophagus is a hallmark precursor to adenocarcinoma, not SCC.

So, when distinguishing SCC from adenocarcinoma, smoking, alcohol, and irritants are the exposures most strongly associated with SCC, while Barrett’s esophagus and obesity are more characteristic of adenocarcinoma risk.