field cancerization
Molecular concept describing widespread mucosal changes in the upper aerodigestive tract from carcinogenic exposure. Explains multicentric tumor development and local recurrence patterns.
Full Definition
Field cancerization refers to the molecular and histologic changes that occur throughout the mucosa of the upper aerodigestive tract following exposure to carcinogens such as tobacco and alcohol. This concept, first described by Slaughter in 1953, explains how apparently normal-appearing mucosa adjacent to tumors may harbor genetic alterations that predispose to malignant transformation. In head and neck oncology, field cancerization accounts for the high incidence of second primary tumors, local recurrences at surgical margins that appear histologically clear, and the challenges in achieving complete tumor eradication. Understanding this concept is crucial for treatment planning and surveillance strategies.
Usage
Usage note: Theoretical concept; avoid confusing with actual multicentric tumors or metastases.
In Context
- "The concept of field cancerization explains why patients develop multiple primary tumors despite successful treatment of the index lesion." — Research article
- "Molecular analysis of surgical margins revealed evidence of field cancerization extending beyond the visible tumor." — Pathology report