PD-L1 expression in gastroesophageal dysplastic lesions.
Virchows Arch
; 477(1): 151-156, 2020 Jul.
Article
em En
| MEDLINE
| ID: mdl-31724072
ABSTRACT
Immunotherapy has been recently approved for gastric (GC) and gastroesophageal-junction adenocarcinomas (GEC), and PD-L1 immunohistochemical evaluation represents a promising predictive biomarker in this oncological setting. A series of 125 gastroesophageal dysplastic lesions (52 low-grade, 73 high-grade) was investigated for PD-L1 and DNA mismatch repair proteins status. PD-L1 was positive (combined positive score (CPS) ≥ 1) in 48 (31.0%) dysplastic lesions. A higher prevalence of PD-L1-positive cases was observed among esophageal specimens compared with gastric ones (p = 0.0003), in high-grade and adenocarcinoma samples in comparison with low-grade dysplasia (p < 0.0001), and in lesions with mismatch repair deficiency (p = 0.028). For 30 dysplastic samples, a synchronous matched invasive lesion (GC = 15, GEC = 15) was available and tested for PD-L1 expression; a discordant PD-L1 status was observed in 12/30 (40%) cases. A relatively high prevalence in PD-L1 positivity was observed among gastroesophageal dysplastic lesions and this should be taken into consideration for future therapeutic strategies based on this biomarker.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Lesões Pré-Cancerosas
/
Neoplasias Gástricas
/
Esôfago de Barrett
/
Antígeno B7-H1
Tipo de estudo:
Prognostic_studies
/
Risk_factors_studies
Limite:
Aged
/
Female
/
Humans
/
Male
/
Middle aged
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article