Beyond Programmed Death-Ligand 1: B7-H6 Emerges as a Potential Immunotherapy Target in SCLC
| Autor: | Cindy Lowe, Darren R. Tyson, Portia L. Thomas, Yun Kai Zhang, Shamilene Sivagnanam, Sarah M. Groves, Qi Liu, Kelli L. Boyd, Wade T. Iams, Hua Chang Chen, Jia Li, Lisa M. Coussens, Vito Quaranta, Yingjun Yan, Prasad R. Kopparapu, Paula Gonzalez-Ericsson, Courtney Betts, Christine M. Lovly, Heidi Chen |
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| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Pulmonary and Respiratory Medicine Durvalumab Lung Neoplasms medicine.medical_treatment B7-H1 Antigen 03 medical and health sciences 0302 clinical medicine Atezolizumab medicine Humans Chemotherapy Tissue microarray business.industry Immunotherapy medicine.disease Primary tumor Small Cell Lung Carcinoma Immune checkpoint Progression-Free Survival respiratory tract diseases 030104 developmental biology Oncology 030220 oncology & carcinogenesis Cancer research Immunohistochemistry business |
| Zdroj: | Journal of thoracic oncology : official publication of the International Association for the Study of Lung Cancer. 16(7) |
| ISSN: | 1556-1380 |
| Popis: | The programmed death-ligand 1 (PD-L1) immune checkpoint inhibitors, atezolizumab and durvalumab, have received regulatory approval for the first-line treatment of patients with extensive-stage SCLC. Nevertheless, when used in combination with platinum-based chemotherapy, these PD-L1 inhibitors only improve overall survival by 2 to 3 months. This may be due to the observation that less than 20% of SCLC tumors express PD-L1 at greater than 1%. Evaluating the composition and abundance of checkpoint molecules in SCLC may identify molecules beyond PD-L1 that are amenable to therapeutic targeting.We analyzed RNA-sequencing data from SCLC cell lines (n = 108) and primary tumor specimens (n = 81) for expression of 39 functionally validated inhibitory checkpoint ligands. Furthermore, we generated tissue microarrays containing SCLC cell lines and patient with SCLC specimens to confirm expression of these molecules by immunohistochemistry. We annotated patient outcomes data, including treatment response and overall survival.The checkpoint protein B7-H6 (NCR3LG1) exhibited increased protein expression relative to PD-L1 in cell lines and tumors (p0.05). Higher B7-H6 protein expression correlated with longer progression-free survival (p = 0.0368) and increased total immune infiltrates (CD45+) in patients. Furthermore, increased B7-H6 gene expression in SCLC tumors correlated with a decreased activated natural killer cell gene signature, suggesting a complex interplay between B7-H6 expression and immune signature in SCLC.We investigated 39 inhibitory checkpoint molecules in SCLC and found that B7-H6 is highly expressed and associated with progression-free survival. In addition, 26 of 39 immune checkpoint proteins in SCLC tumors were more abundantly expressed than PD-L1, indicating an urgent need to investigate additional checkpoint targets for therapy in addition to PD-L1. |
| Databáze: | OpenAIRE |
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