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Purpose:  Up to 50% of Asian patients with NSCLC have  EGFR  gene mutations, indicating that selecting eligible patients for  EGFR -TKIs treatments is clinically important. The aim of the study is to develop and validate radiomics-based nomograms, integrating radiomics, CT features and clinical characteristics, to non-invasively predict  EGFR  mutation status and subtypes.   Materials and Methods:  We included 637 patients with lung adenocarcinomas, who performed the  EGFR  mutations analysis in the current study. The whole dataset was randomly split into a training dataset ( n  = 322) and validation dataset ( n  = 315). A sub-dataset of  EGFR -mutant lesions ( EGFR  mutation in exon 19 and in exon 21) was used to explore the capability of radiomic features for predicting  EGFR  mutation subtypes. Four hundred seventy-five radiomic features were extracted and a radiomics sore (R-score) was constructed by using the least absolute shrinkage and selection operator (LASSO) regression in the training dataset. A radiomics-based nomogram, incorporating clinical characteristics, CT features and R-score was developed in the training dataset and evaluated in the validation dataset.   Results:  The constructed R-scores achieved promising performance on predicting  EGFR  mutation status and subtypes, with AUCs of 0.694 and 0.708 in two validation datasets, respectively. Moreover, the constructed radiomics-based nomograms excelled the R-scores, clinical, CT features alone in terms of predicting  EGFR  mutation status and subtypes, with AUCs of 0.734 and 0.757 in two validation datasets, respectively.   Conclusions:  Radiomics-based nomogram, incorporating clinical characteristics, CT features and radiomic features, can non-invasively and efficiently predict the  EGFR  mutation status and thus potentially fulfill the ultimate purpose of precision medicine. The methodology is a possible promising strategy to predict  EGFR  mutation subtypes, providing the support of clinical treatment scenario.

frontiers in oncology

The Potential of Radiomics Nomogram in Non-invasively Prediction of Epidermal Growth Factor Receptor Mutation Status and Subtypes in Lung Adenocarcinoma