Clinicopathological association of programmed death-ligand 1 (PD-L1) expression in uterine cervical carcinomas: A cross-sectional observational study
ABSTRACT
Background:
Programmed death ligand ( PD-L1 ) binds to its receptor PD-1 on T-cells and inhibits the immune response of T-lymphocytes. Cancer cells evade immune surveillance by upregulating PD-L1 expression, leading to tumor progression. Anti- PD-L1 immunotherapy has emerged as a new treatment modality in various solid carcinomas. Food and Drug Administration (FDA) has approved PD-1 / PD-L1 axis immunotherapy for immunohistochemically PD-L1 positive cervical cancer. In India, cervical cancer accounts for approximately 17% of all cancer deaths among women between 30 and 70 years. More than three-fourths of patients are diagnosed at an advanced stage.
Materials and Methods:
A hospital-based, cross-sectional prospective study was conducted over five years. 119 histologically proven cases of cervical carcinoma meeting the inclusion criteria were included in the study. Sections were stained with PD-L1 antibody clone SP263 as recommended on Ventana Benchmark XT.
Results:
Of 119 cases, PD-L1 expression was found in 42 cases (35%). Patients over 45 years (75.6%) had higher PD-L1 positivity compared to those under 45 years (24.4%). 31% of squamous cell carcinoma was PD-L1 positive compared to adenocarcinoma (29%). PD-L1 expression was more frequent in poorly differentiated carcinoma (37.5%).
Conclusion:
A significant proportion of cervical cancers expressed PD-L1 . Increased PD-L1 expression was seen with increasing age and poorly differentiated histological grade. Anti- PD-L1 immunotherapy can be an option in PD-L1 -positive cervical cancer. The findings of our study support the requirement for further investigation of anti- PD-L1 immunotherapy for the treatment of PD-L1 -positive cervical carcinomas.