Bronchogenic cancer: It still exists

Area of Science:

• Head and Neck Pathology
• Surgical Oncology
• Diagnostic Cytology

Background:

• Cystic cervical masses are common, with branchial cleft cysts being a frequent diagnosis.
• Squamous cell carcinoma differentiation within these cysts, termed bronchogenic carcinoma, is rare and diagnostically challenging.
• The existence of bronchogenic carcinoma is debated due to inconsistent immunohistologic evaluations.

Purpose of the Study:

• To identify clinical and immunohistologic features of bronchogenic carcinoma.
• To differentiate bronchogenic carcinoma from other cystic cervical masses.
• To establish the diagnostic utility of specific immunohistochemical markers.

Main Methods:

• Retrospective case series comparing branchial cleft cysts (n=63), bronchogenic carcinomas (n=5), cystic metastasized oropharyngeal carcinomas (n=97), and carcinomas of unknown primary (n=51).
• Immunohistochemical analysis included epidermal growth factor receptor, cytokeratins 5, 6, 7, 13, and p16.
• Epidemiologic assessments were also performed.

Main Results:

• Bronchogenic carcinoma patients differed significantly in age and lymph node involvement compared to other groups.
• Regular histologic wall structures were present in bronchogenic carcinomas and branchial cleft cysts.
• Solitary cytokeratin-7 staining was specific to bronchogenic carcinomas, which were all p16 negative.

Conclusions:

• The clinical findings support the existence of bronchogenic carcinoma.
• Immunohistochemical staining for cytokeratin-7 and p16 can aid in distinguishing bronchogenic carcinoma from other cystic cervical masses.
• These markers are valuable in the diagnostic workflow for complex cervical masses.