Endoscopic screening of the upper gastrointestinal tract for second primary tumors in patients with head and neck cancer in a Western country

Background Patients with head and neck squamous cell carcinoma ( HNSCC) can develop second primary tumors (SPTs) in the esophagus. Endoscopic screening could lead to detection of SPTs at early stages and improve survival. Methods We performed a prospective endoscopic screening study in patients with curably treated HNSCC diagnosed between January 2017-July 2021 in a Western country. Screening was performed synchronously (< 6 months) or metachronously (<= 6 months) after HNSCC diagnosis. Routine imaging for HNSCC consisted of flexible transnasal endoscopy with positron emission tomography/ computed tomography or magnetic resonance imaging, depending on primary HNSCC location. The primary outcome was prevalence of SPTs, defined as presence of esophageal high grade dysplasia or squamous cell carcinoma. Results 202 patients ( mean age 65 years, 80.7% male) underwent 250 screening endoscopies. HNSCC was located in the oropharynx ( 31.9%), hypopharynx (26.9%), larynx ( 22.2%), and oral cavity (18.5%). Endoscopic screening was performed within 6 months (34.0%), 6 months to 1 year (8.0%), 1-2 years (33.6%), and 2- 5 years (24.4%) after HNSCC diagnosis. We detected 11 SPTs in 10 patients (5.0%, 95 % CI 2.4%- 8.9%) during synchronous (6/85) and metachronous (5/165) screening. Most patients had early stage SPTs (90%) and were treated with curative intent with endoscopic resection (80 %). No SPTs in screened patients were detected with routine imaging for HNSCC before endoscopic screening. Conclusion In 5% of patients with HNSCC, an SPT was detected with endoscopic screening. Endoscopic screening should be considered in selected HNSCC patients to detect early stage SPTs, based on highest SPT risk and life expectancy according to HNSCC and comorbidities.

Automated summary

This study conducted endoscopic screening in patients with locally advanced or advanced head and neck squamous cell carcinoma (HNSCC), and found that 5% of patients had esophageal high-grade dysplasia and squamous cell carcinoma detected during screening. This suggests that endoscopic screening can help identify second primary tumors in patients at an early stage and improve survival.