A novel transcriptional signature identifies T-cell infiltration in high-risk paediatric cancer
Mayoh, C.; Gifford, A.; Terry, R.; Lau, L. M.; Wong, M.; Rao, P.; Shai-Hee, T.; Saletta, F.; Khuong-Quang, D.-A.; Qin, V.; Mateos, M.; Meyran, D.; Miller, K. E.; Yuksel, A.; Mould, E. V.; Bowen-James, R.; Govender, D.; Senapati, A.; Zhukova, N.; Omer, N.; Dholaria, H.; Alvaro, F.; Tapp, H.; Diamond, Y.; Dalla Pozza, L.; Moore, A. S.; Nicholls, W.; Gottardo, N. G.; McCowage, G.; Hansford, J. R.; Khaw, S.-L.; Wood, P. J.; Catchpoole, D.; Cottrell, C. E.; Mardis, E. R.; Marshall, G. M.; Tyrrell, V.; Haber, M.; Ziegler, D. S.; Vittorio, O.; Trapani, J. A.; Cowley, M. J.; Neeson, P. J.; Ekert, P. G
Show abstract
Molecular profiling of the tumour immune microenvironment (TIME) has enabled the rational choice of immunotherapies in some adult cancers. In contrast, the TIME of paediatric cancers is relatively unexplored. We speculated that a more refined appreciation of the TIME in childhood cancers, rather than a reliance on commonly used biomarkers such as tumour mutation burden (TMB), neoantigen load and PD-L1 expression, is an essential prerequisite for improved immunotherapies in childhood solid cancers. We combined immunohistochemistry (IHC) and molecular profiling to develop an alternative, expression-based signature associated with CD8+ T-cell infiltration of the TIME in high-risk paediatric tumours. Using this novel 15-gene immune signature, Immune Paediatric Signature Score (IPASS), we estimate up to 31% of high-risk cancers harbour infiltrating T-cells. Our data provides new insights into the variable immune-suppressive mechanisms dampening responses in paediatric solid cancers. Effective immune-based interventions in high-risk paediatric cancer will require individualised analysis of the TIME.
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