Rethinking Surgical Margins: A New Approach to Predict Outcomes in Oral Squamous Cell Carcinoma

Area of Science:

• Oncology
• Surgical Pathology
• Cancer Research

Background:

• The established 5mm cutoff for evaluating surgical margins in oral cavity squamous cell carcinoma (OCSCC) lacks definitive prognostic value.
• Current methods for assessing surgical margins in OCSCC are controversial, necessitating a re-evaluation of their predictive accuracy.
• Understanding the prognostic implications of surgical margin status is crucial for optimizing treatment strategies and patient outcomes in OCSCC.

Purpose of the Study:

• To investigate whether surgical margin distance in OCSCC can be better predicted using a continuous variable approach rather than a fixed cutoff.
• To determine if treating surgical margins as a continuum enhances the predictive value for survival and locoregional control in OCSCC.
• To develop a more accurate predictive model for OCSCC patient outcomes by analyzing margin distance as a continuous spectrum.

Main Methods:

• A retrospective analysis of 266 oral cavity squamous cell carcinoma (OCSCC) patients treated between 1995 and 2020.
• Evaluation of clinical, pathological, and surgical data, including margin distance, using regression analyses to assess impact on survivability.
• Comparison of predictive accuracy between categorical (5mm cutoff) and continuous margin assessments, with multivariate analysis to control for confounders.

Main Results:

• Stratification by the traditional categorical margin status (5mm cutoff) showed no significant difference in patient survival (p=0.54).
• Re-evaluating margin distance as a continuous variable yielded statistically significant improvements in predicting survival outcomes (p=0.0018).
• Continuous margin assessment also demonstrated a trend towards improved prediction of locoregional control (p=0.06) compared to categorical analysis (p=0.59).

Conclusions:

• The continuum spectrum of surgical margin distance provides a more accurate prediction of survival outcomes in oral cavity squamous cell carcinoma (OCSCC).
• Treating surgical margin distance as a continuous variable significantly enhances the assessment of locoregional control in OCSCC.
• This study supports a shift from categorical to continuous analysis of surgical margins for improved prognostic accuracy in OCSCC management.