Expression of Programmed Death Ligand 1 [PD-L1] and Mismatch Repair Status in Squamous Cell Carcinomas of Cervix

Background and Objectives To assess mismatch repair (MMR) status and programmed death-ligand 1 (PD-L1) expression in squamous cell carcinomas of the cervix and their association with clinicopathologic parameters. Material and Methods Expression of PD-L1 and MMR status (MSH2, MSH6, MLH1, and PMS2) was assessed on 50 cases of SCCs of the cervix by immunohistochemistry. Results 80% of tumor cells and 84% of tumor-infiltrating lymphocytes showed PD-L1 expression. 80% of cases had a combined positive score (CPS) of > 1, whereas 20% had a CPS of < 1. 94% of cases showed pMMR proteins, while 6% showed dMMR. 94% of the SCCs were HPV associated, and 6% were HPV-independent. All HPV-independent SCCs of the cervix showed PD-L1 expression, and all HPV-associated SCCs showed MMR deficiency. Between PD-L1 expression in the tumor and the grade of the tumor, a statistically significant association was noted ( p = 0.022). All MMR-deficient SCCs were HPV-independent. Conclusion This research highlighted the HPV association in cervical SCCs in the Indian population. Most of the cervical SCCs were HPV-associated. Furthermore, most of the HPV-associated SCCs were MMR stable. This study found no significant association between MMR status and PD-L1 expression in cervical SCCs.