Abstract
Background
Targeted RNA sequencing (RNA-seq) from FFPE specimens is used clinically in cancer for its ability to estimate gene expression and to detect fusions. Using a cohort of NSCLC patients, we sought to determine whether targeted RNA-seq could be used to measure tumour mutational burden (TMB) and the expression of immune-cell-restricted genes from FFPE specimens and whether these could predict response to immune checkpoint blockade.
Methods
Using The Cancer Genome Atlas LUAD dataset, we developed a method for determining TMB from tumour-only RNA-seq and showed a correlation with DNA sequencing derived TMB calculated from tumour/normal sample pairs (Spearman correlation = 0.79, 95% CI [0.73, 0.83]. We applied this method to targeted sequencing data from our patient cohort and validated these results against TMB estimates obtained using an orthogonal assay (Spearman correlation = 0.49, 95% CI [0.24, 0.68]).
Results
We observed that the RNA measure of TMB was significantly higher in responders to immune blockade treatment (P = 0.028) and that it was predictive of response (AUC = 0.640 with 95% CI [0.493, 0.786]). By contrast, the expression of immune-cell-restricted genes was uncorrelated with patient outcome.
Conclusion
TMB calculated from targeted RNA sequencing has a similar diagnostic ability to TMB generated from targeted DNA sequencing.
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Data availability
The datasets generated and/or analysed during the current study are available from the corresponding author on reasonable request.
Code availability
R code that implements the variant filtering strategies, performs differential expression analysis and generates all figures contained in this manuscript, along with all relevant data are available on Figshare at https://doi.org/10.6084/m9.figshare.21332646.
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Acknowledgements
We thank all the patients who participated in this study. We acknowledge the cooperation of the Melbourne Health Shared Pathology Service. We thank Ann Officer and Marliese Alexander for the study coordination. We thank Dr Michael Christie for the pathology review. Some results shown here are based on data generated and made publicly available by the TCGA Research Network (http://cancergenome.nih.gov/).
Funding
This work was funded by Bristol Myers Squibb.
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JFM and APF designed the work, played important roles in interpreting the results, and drafted and revised the manuscript. RL and DC played important roles in interpreting the results and revising the manuscript. TG acquired the laboratory data and drafted the manuscript. TM acquired the clinical data. JLL, TJ, BS and SBF played important roles in interpreting the results and revising the manuscript. All authors approved the final version of this manuscript and are accountable for all aspects of the work.
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SF is on advisory boards for AstraZeneca, Pfizer, Merck, Bayer, GSK, Roche, Janssen, Novartis, and Thermo Fisher. Honoraria are paid to Peter MacCallum Cancer Centre. BS is on advisory boards/receives honoraria for Roche/Genentech, Pfizer, Novartis, AstraZeneca, Merck, Bristol Myers Squibb, Amgen, BeiGene, Janssen and Lilly.
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All patients gave written informed consent for their tissue samples and medical history to be used in this research. This research was approved by the Peter MacCallum Cancer Centre Human Research Ethics Committee (HREC ref HREC/17/PMCC/42). This study was performed in accordance with the Declaration of Helsinki.
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Markham, J.F., Fellowes, A.P., Green, T. et al. Predicting response to immune checkpoint blockade in NSCLC with tumour-only RNA-seq. Br J Cancer 128, 1148–1154 (2023). https://doi.org/10.1038/s41416-022-02105-w
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DOI: https://doi.org/10.1038/s41416-022-02105-w