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Clinicopathological and prognostic significance of PD‐L1 in oral cancer: A preliminary retrospective immunohistochemistry study
Author(s) -
Lenouvel Daniel,
GonzálezMoles Miguel Ángel,
RuizÁvila Isabel,
ChamorroSantos Clara,
GonzálezRuiz Lucía,
GonzálezRuiz Isabel,
RamosGarcía Pablo
Publication year - 2021
Publication title -
oral diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.953
H-Index - 87
eISSN - 1601-0825
pISSN - 1354-523X
DOI - 10.1111/odi.13509
Subject(s) - immunohistochemistry , pathology , medicine , tongue , staining , carcinogenesis , retrospective cohort study , epithelium , cancer , infiltration (hvac) , oncology , physics , thermodynamics
Objective To evaluate the relation between PD‐L1 expression in oral cavity squamous cell carcinomas and clinicopathological features as well as survival outcomes. Methods A retrospective immunohistochemical study was carried out on 55 archived tumours from 55 patients. Tumours were stained for PD‐L1 and scored by the proportion of tumour cells with positive membranous staining. PD‐L1 scores were compared to the patient's clinicopathological characteristics for any significant associations. Kaplan–Meier curves were constructed for PD‐L1 positive and negative tumours to investigate any advantage to survival. Results Positive PD‐L1 staining was found in 58% of tumours and was significantly more likely in non‐smokers, non‐drinkers and in tongue squamous cell carcinomas. Increased PD‐L1 was also associated with increased lymphocyte infiltration as well as PD‐L1 staining in lymphocytes and the epithelium adjacent to tumour invasion. No survival benefit was seen from PD‐L1 expression in tumour cells. Conclusions PD‐L1 expression is more common in non‐smokers and non‐drinkers, and its presence in the adjacent non‐tumour epithelium suggests it may be involved in early oncogenesis.