Use este identificador para citar ou linkar para este item: http://repositorio.ufc.br/handle/riufc/47037
Tipo: Artigo de Periódico
Título: The frequency of high PD-L1 expression is low in lung adenocarcinoma patients from Northeast Brazil
Autor(es): Silva, Antonio V. Alves da
Martins Neto, Francisco
Oliveira, Ana Claudia da Silva M. de
Carneiro, Benedito A.
Alves, Marclesson
Nogueira, Cleto Dantas
Tavora, Tavora
Palavras-chave: Imunoterapia;Immunotherapy;Adenocarcinoma
Data do documento: Fev-2019
Instituição/Editor/Publicador: Surgical and Experimental Pathology
Citação: SILVA, Antonio V. Alves da et al. The frequency of high PD-L1 expression is low in lung adenocarcinoma patients from Northeast Brazil. Surgical and Experimental Pathology v. 2, n. 4, p 1-6, feb. 2019.
Abstract: Background: As Immune checkpoint inhibitors (ICPIs) are changing the standard-care in lung cancer with good clinical activities and durable responses, its indication must be based on the appropriate patient selection once only a fraction of patients has a response to these costly drugs. In larger cohorts the expression of programmed cell death–ligand 1 (PD-L1) has been associated with good clinical response of ICPIs in lung adenocarcinoma where the rate of high PD-L1 expression (defined as PD-L1tumor proportion score ≥ 50%) is ~ 30%, but once rare studies are available addressing the frequency of PD-L1 in populations outside those cohorts, we aimed to report the prevalence of PD-L1 and the frequency of patients with high PD-L1 expression utilizing data from a major pathology laboratory in Northeastern Brazil. Methods: We retrospectively evaluated the PD-L1 expression in 158 surgically resected primary lung adenocarcinoma including 158 with anaplastic lymphoma kinase (ALK) expression. PD-L1 and ALK expression were evaluated by immunohistochemical analysis with the SP263 and D5F3 assays, respectively. Results: Of the 158 samples analyzed, 94 (59.5%) had a PD-L1 tumor proportion score (TPS) < 1%, 38 (24.0%) had a PD-L1 TPS of 1–49% and 26 (16.5%) had a PD-L1 TPS of ≥50%. ALK expression was detected in 21 (13.3%) of the 158 tumor samples and 5 (3.2%) of them had a PD-L1 TPS of ≥50%. Conclusion: The frequency of strong PD-L1 expression was lower than that previously reported in the trials where PD-L1 expression was used as a biomarker for patient selection. Also, considering that a subset of patients with ALK positivity had a strong PD-L1 expression, further studies will be required to examine the efficacy of PD-1/PD-L1 inhibitors in such patients.
URI: http://www.repositorio.ufc.br/handle/riufc/47037
ISSN: 2520-8454
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