A physician-validated, board-style question from the Active Transport QBank. Try it, then check the reasoning for every option.
A 45-year-old African American male presents to his primary care physician complaining of difficulty swallowing that was initially limited to solids but has now progressed to liquids. Biopsy of the esophagus reveals dysplastic cells, but does not show evidence of glands or increased mucin. Which of the following patient behaviors most contributed to his condition?
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A
ObesityIncorrect. Obesity is the main behavioral risk factor for esophageal ADENOCARCINOMA (via GERD/Barrett), not SCC.
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B
SmokingCorrect. smoking is the dominant behavioral risk factor for squamous cell carcinoma of the esophagus, especially in combination with alcohol.
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C
Gastroesophageal reflux diseaseIncorrect. GERD predisposes to Barrett metaplasia and adenocarcinoma of the DISTAL esophagus — characterized by glandular epithelium with mucin, which the biopsy specifically lacks.
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D
Radiation exposure in the past 6 monthsIncorrect. Recent radiation is not a typical cause of esophageal SCC; therapy-related SCC requires years of latency, and there is no radiation history given.
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E
Heavy alcohol consumptionIncorrect. Alcohol is a recognized risk factor for esophageal SCC, but smoking is the dominant behavioral risk factor (and the question asks which behavior "most contributed") — alcohol acts synergistically with tobacco rather than being the primary driver.
↑ Tap an answer to reveal the reasoning
Answer: B. A middle-aged man with progressive dysphagia (solids → liquids) and an esophageal biopsy showing dysplastic squamous cells WITHOUT glands or mucin has squamous cell carcinoma of the esophagus. The absence of glandular structures and mucin distinguishes it from adenocarcinoma; the dysplastic squamous epithelium pattern is diagnostic of SCC.
The two dominant risk factors for esophageal SCC worldwide are smoking and alcohol use, which act synergistically. African American men have the highest incidence in the United States. SCC typically arises in the upper and middle thirds of the esophagus, in contrast to adenocarcinoma, which arises in the distal third from Barrett esophagus driven by chronic GERD and obesity.
Other SCC risk factors include hot beverages, nitrosamines, achalasia, Plummer-Vinson syndrome, and caustic strictures. The progressive dysphagia from solids to liquids reflects luminal obstruction by the tumor — a classic mechanical pattern that, combined with weight loss, mandates endoscopy.
**Why each option:**
**A.** Obesity is the main behavioral risk factor for esophageal ADENOCARCINOMA (via GERD/Barrett), not SCC.
**B.** Correct — smoking is the dominant behavioral risk factor for squamous cell carcinoma of the esophagus, especially in combination with alcohol.
**C.** GERD predisposes to Barrett metaplasia and adenocarcinoma of the DISTAL esophagus — characterized by glandular epithelium with mucin, which the biopsy specifically lacks.
**D.** Recent radiation is not a typical cause of esophageal SCC; therapy-related SCC requires years of latency, and there is no radiation history given.