Using Artificial Intelligence (AI) to Model Clinical Variant Reporting for Next Generation Sequencing (NGS) Oncology Assays
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Background
Targeted next generation sequencing (NGS) of somatic DNA is now routinely used for diagnostic and predictive reporting in the oncology clinic. The expert genomic analysis required for NGS assays remains a bottleneck to scaling the volume of patients being assessed. This study harnesses data from targeted clinical sequencing to build machine learning models that predict whether patient variants should be reported.
Methods
Three somatic assays were used to build machine learning prediction models (Stochastic Gradient Descent, Random Forest, XGBoost and Neural Networks). Using manual expert curation to select reportable variants as ground truth, we built models to classify clinically reportable variants. Assays were performed between 2020 and 2023 yielding 1,350,018 variants and used to report on 10,116 patients. All variants, together with 211 annotations and sequencing features, were used by the models to predict the likelihood of variants being reported.
Results
The tree-based ensemble models performed consistently well achieving between 0.891 and 0.995 on the precision recall/area under the curve (PRC AUC) metric when predicting whether a variant should be reported. To assist model explainability, individual model predictions were presented to users within a tertiary analysis platform as a waterfall plot showing individual feature contributions and their values for the variant. Over 30% of the model performance was due to features sourced from statistics derived in-house from the sequencing assay precluding easy generalization of the models to other assays or other laboratories.
Conclusions
Longitudinally acquired NGS assay data provide a strong basis for machine learning models for decision support to select variants for clinical oncology reports. The models provide a framework for consistent reporting practices and reducing inter-reviewer variability. To improve model transparency, individual variant predictions are able to be presented as part of reviewer workflows.
