Biopsy Quality is Essential for Preoperative Prognostication in Oral Tongue Cancer

Abstract

Background: A role for incisional biopsy in preoperative prognostication is increasingly being advocated in oral tongue squamous cell carcinomas (OTSCC). Biopsies at two locations were compared and prognostic factors in biopsies and their corresponding resections were evaluated. Methods: A total of 138 OTSCC biopsy slides from Finland and Saudi-Arabia were compared for size (horizontal and vertical) and invasive front. The Finnish cases were assessed for tumor stroma ratio (TSR) and tumor-infiltrating lymphocytes (TILs) using light microscopy and digital image analysis assessment and compared. Furthermore, TSR, TILs, and previously analyzed budding and depth of invasion (BD) score in biopsies were compared with their evaluation in the corresponding resections. Results: Finnish biopsies were deeper than Saudi-Arabian biopsies (59% versus 42%) while Saudi-Arabian biopsies were wider (98% versus 76%). Invasion fronts were more readily assessable in Finnish biopsies (72% versus 40%). There was 86.8% agreement between TSR and 75% agreement between TIL evaluation using light microscopy and digital assessment. Significant agreement was obtained on comparing the TSR (P=0.04) and BD (P<0.001) values in biopsies and resections. Conclusions: Biopsies of ≥5 mm depth from representative OTSCC areas are essential for prognostic information. Clinical pathologists are advised to assess BD score and TSR for prognostic features in such biopsies.

Biomarkers for Immunotherapy of Oral Squamous Cell Carcinoma: Current Status and Challenges

“…After further validation in large cohorts, this simple method for the assessment of TILs can be used to monitor response to immunotherapy. In addition to validation, it is important to overcome some limitations such as lack of consensus on the morphologic evaluation of TILs in OSCC and difficulty in assessing TILs using the preoperative diagnostic biopsies ( 20 ).…”