Quantifying Immune Checkpoint engagement in Patient Biopsies
Cacho Navas, C.; Camacho, L.; Aguero, J.; Batmunkh, B.; Gracia, J.; Eduardo de Andrea, C.; Martin Algarra, S.; Rementeria, M.; Miles, J.; Gumuzio, J.; Aguirre, F.; Parker, P. J.; Calleja, V.
Show abstract
Immune checkpoint blockade (ICB) has emerged as a transformative approach in cancer treatment showing remarkable results on previously untreatable cancers. Nevertheless, a high percentage of patients fail to respond to treatment and often suffer strong immune related adverse events (irAE). Therefore, it becomes critical to identify with high confidence the patients who will respond to ICB using robust predictive biomarkers. To date patient stratification to treatment using current FDA approved biomarkers like PD-L1 TPS score has been poor. Hence, we propose that biomarkers assessing immune checkpoint functional state should better reflect the actual immune status of the tumour microenvironment (TME). Here, we describe a methodology for assessing the interaction of a panel of immune checkpoints in tissue and tumour samples using a quantitative spatial proteomics approach (QF-Pro). The functional immune profiling of tumours has the potential to provide a more profound understanding of the mechanisms put in place by the tumour to evade immune surveillance and offers a unique opportunity for the development of personalised immunotherapy regimens.
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