Multiparameter Flow Cytometry Assay for Quantification of Immune Cell Subsets, PD-1 Expression Levels and PD-1 Receptor Occupancy by Nivolumab and Pembrolizumab.
Cytometry A
; 95(10): 1053-1065, 2019 10.
Article
em En
| MEDLINE
| ID: mdl-31407460
ABSTRACT
We report the development and validation of a 12 parameter immunofluorescence flow cytometry method for the sensitive determination of cell concentrations, their expression of PD-1, and PD-1 receptor occupancy. Cell subsets include CD4+ and CD8+ -T-cells, B-cells, natural killer cells, classical-, intermediate- and non-classical monocytes, and myeloid- and plasmacytoid dendritic cells. Cells were isolated from peripheral blood by density gradient centrifugation. The validation parameters included specificity, linearity, limit of quantification, precision, biological within- and between subject variations. The lower limit of quantification was 5.0% of PD-1+ cells. Samples were stable for at least 153 days of storage at -80°C. The clinical applicability of the method was demonstrated in 11 advanced cancer patients by the successful determination of immune cell concentrations, relative number of PD-1+ immune cells, and number of PD-1 molecules per immune cell. Shortly after infusion of nivolumab, receptor occupancy on CD8+ -T-cells was 98%. Similar values were found predose cycle 2, suggesting receptor occupancy remained high throughout the entire cycle. © 2019 International Society for Advancement of Cytometry.
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Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Imunoensaio
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Anticorpos Monoclonais Humanizados
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Antígeno B7-H1
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Receptor de Morte Celular Programada 1
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Citometria de Fluxo
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Nivolumabe
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Leucócitos
Limite:
Humans
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article