Improving the diagnosis of common parotid tumors via the combination of CT image biomarkers and clinical parameters

Abstract

Objective: To develop and validate diagnostic models of the common parotid tumors based on wholevolume CT textural image biomarkers (IBMs) in combination with clinical parameters at a single institution. Methods: The study cohort was composed of 51 pleomorphic adenoma (PA) patients and 42 Warthin tumor (WT) patients. Clinical parameters and conventional image features were scored retrospectively and textural IBMs were extracted from CT images of arterial phase . Independentsamples t test or Chi-square test was used for evaluating the significance of the difference among clinical parameters, conventional CT image features, and textural IBMs. The diagnostic performance of univariate model and multivariate model was evaluated via receiver operating characteristic (ROC) curve and area under ROC curve (AUC). Results: Significant differences were found in clinical parameters (age, gender, disease duration, smoking), conventional image features (site, maximum diameter, time-density curve, peripheral vessels sign) and textural IBMs (mean, uniformity, energy, entropy) between PA group and WT group (P 0.05). ROC analysis showed that clinical parameter (age) and quantitative textural IBMs (mean, energy, entropy) were able to categorize the patients into PA group and WT group, with the AUC of 0.784, 0.902, 0.910, 0.805, respectively. When IBMs were added in clinical model, the multivariate models including age-mean and age-energy performed significantly better than the univariate models with the improved AUC of 0.940, 0.944, respectively (P 0.001). Conclusions: Both clinical parameter and CT textural IBMs can be used for the preoperative, noninvasive diagnosis of parotid PA and WT. The diagnostic performance of textural IBM model was obviously better than that of clinical model and conventional image model in this study. While the multivariate model consisted of clinical parameter and textural IBM had the optimal diagnostic performance, which would contribute to the better selection of individualized surgery program. Background Parotid tumor is the most common type of salivary gland tumor, and 75-80% of them are benign[1].Pleomorphic adenoma (PA) and Warthin tumor (WT) are the two most common types of the parotid tumors, and the incidence of WT has gradually increased in recent years [1,2]. They are both benign, but the biological behavior and surgical plan are absolutely different. PA may become malignant due ZT contributed to the study design. DZ carried out the collection and assembly of data and drafted the manuscript. DZ and HX did the feature extraction and LL, JY did statistical work. XL, RL and CY prepared figures. XH and BZ participated in the design of the study and helped to draft the manuscript. All authors reviewed the manuscript. All authors read and approved the final manuscript. Ethics approval and consent to participate