A study exploring the roles of desmoplastic reaction, tumor budding, tumor infiltrating lymphocytes, and depth of invasion as potential predictive parameters for extranodal extension in oral squamous cell carcinoma.

BACKGROUND

Head and neck squamous cell carcinomas constitute the eighth most common malignancy worldwide. Desmoplastic reaction (DR), tumor budding (TB), tumor-infiltrating lymphocytes (TILs), and depth of invasion (DOI) are some of the histological predictors of extranodal extension (ENE) and poor prognosis. In this study, we aimed to investigate their association in oral squamous cell carcinoma (OSCC).

MATERIALS AND

METHODS

This retrospective analytical study included 329 specimens of OSCC from our hospital. All data were collected from the histopathological records (e.g. age, gender, diagnosis, lymph node metastasis, ENE, DR, TB, TILs, and DOI). The datasets were analyzed using the Chi-square test and GraphPad InStat 3 software.

RESULTS

The majority of cases were seen in the age group of ≥60 years (221/329, 67.17%). Out of 35 ENE-positive patients, 31 (88.6%) had progressive OSCC. We found a significant association between immature DR (DR-I), high TB (TB-H), and low TILs with pathological DOI (pDOI) >10 mm (P value: <0.0001, 0.001, and < 0.001, respectively). There was a significant association between DR, TB, and TILs at the primary site with that of the ENE sites (P value: 0.02, 0.002, and 0.001, respectively). TB-H and pDOI >10 mm were the independent variables for the prediction of ENE (95% confidence interval [CI] = 1.07-4.95, P value: 0.003 and 95% CI = 1.11-1.52, P value: 0.0008, respectively). TB-H and pDOI >10 mm showed the highest sensitivity (85.1% and 97.1%, respectively) and DR-I exhibited the highest specificity (83.8%) for the presence of ENE.

CONCLUSION

Detecting ENE not only predicts outcomes but also influences the treatment strategies and quality of life.