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GP12: Correlation between DOI (Depth of Invasion) on MRI vs DOI on HPE in SCC Tongue- A Single Centre Experience of 887 patients

Introduction: DOI has come out to be an important parameter in SCC (Squamous Cell Carcinoma) of Oral Cavity. Increasing emphasis on this dimension of Tumour characteristic has led to inclusion of DOI in the AJCC TNM Staging of Oral Cavity SCC. Pre-operative evaluation of DOI in SCC Tongue is chiefly based on Imaging. Imaging Modality of choice in SCC Tongue is MRI (Magnetic Resonance Imaging). There has been a debate on how well DOI on MRI correlates with DOI on final HPE (Histopathological Examination) Report. This could give an idea about the Actual DOI and help plan END (Elective Node Dissection) and Adjuvant Therapy in the Pre-operative setting.

MATERIALS AND

Methods: We present here a Retrospective, Observational study of 887 patients of SCC Tongue. The study included patients over a time period of 5 years (2018 – 2023). All cases included in the study had Tongue as the primary disease site without the involvement of other oral cavity subsites or secondary sites. DOI on Imaging was obtained by MRI as modality, reported by the same team of consultant Radiologists and verified by Second Consultant. DOI was noted for each case from final HPE report. Statistical Analysis was done, and Correlation Coefficient calculated.

Results: Results demonstrated that there is a Linear Relation between DOI on MRI and DOI on HPE. Linear Regression analysis produced an equation: y=0.7177x + 0.5148; i.e., for every unit increase in DOI on HPE, DOI on MRI is expected to increase by 0.7177 units. r2 value was 0.634; i.e., 63.4 % of the variability in DOI on HPE can be attributed to the variability in DOI on MRI. Other significant finding was that DOI on Imaging overestimated DOI on HPE by 31.46 %.

Conclusion: DOI on MRI is an essential part of preoperative work up of SCC Tongue. Our study demonstrates a linear correlation between DOI on MRI and DOI on HPE. DOI on MRI is essential in planning END (Elective Neck Dissection) and gives an idea about the expected Adjuvant Therapy in the preoperative period.