With the advancement of bioinformatics technology, many prognostic gene markers have been developed [25]. Correct identification is essential to prevent tumor recurrence and therapeutic effect. Features integrated by polygenic profiles, especially miRNAs, have been identified in CRC and validated as candidate biomarkers [26–28].
Researchers have leveraged the power of miRNAs in the field of medicine, focusing primarily on the diagnosis and prognosis of various diseases. Nevertheless, there is a scarcity of research investigating the precision of miRNAs in the diagnosis of CRC. The meta-analysis included 23 studies and using diagnostic meta-analysis technique. The combined sensitivity and specificity of CRC were 0.83 (95%CI0.81-0.84) and 0.83 (95%CI0.81-0.84), respectively. The sensitivity and specificity of miRNAs data analysis for CRC diagnosis were strong. The findings demonstrated that miRNAs exhibited superior accuracy in the diagnosis of CRC. In addition, the area under the curve (AUC) in our meta-analysis results was 0.90 (95% confidence interval: 0.87–0.92), suggesting that the machine learning methods exhibited high accuracy in the diagnosis of CRC.
The PLR and NLR components of the likelihood ratio (LR) can also represent the accuracy of a diagnosis [29, 30]. The likelihood of a disease being diagnosed or ruled out increased significantly when the positive likelihood ratio was greater than 10 or the negative likelihood ratio was less than 0.1 [31]. In our meta-analysis, the pooled positive likelihood ratio (PLR) was 4.60 (95% CI: 3.77–5.62) and the negative likelihood ratio (NLR) was 0.22 (95% CI: 0.17–0.27). These findings indicate that machine learning methods have a much greater rate of correctly diagnosing CRC compared to incorrectly identifying it.
As an independent indicator of morbidity, the DOR reflects the degree of correlation between diagnosis and disease [32–34]. The pooled DOR was 23.79 (95% CI: 16.26–34.81), indicating that machine learning methods have a reliable overall accuracy in identifying CRC. In addition, Fagan diagram was drawn to analyze the use of miRNA to improve the effectiveness of CRC diagnosis. The results showed that the combined PLR of miRNA in the diagnosis of CRC was > 1, and the NLR was > 0.1, also indicating that miRNA was of great value in the clinical diagnosis of CRC, and the diagnostic value of exclusion was limited.
This study was limited in a few ways. First of all, although there are quite a lot of literatures on the diagnosis of CRC by miRNA, most of them lack the necessary data for sex experiments, such as TF, NF, F1, etc. This resulted in only 23 articles being included, which somewhat reduced the viability of the results. Second, after a thorough search of the literature, most studies were small sample and single center studies, which may limit miRNA's ability to reliably assess CRC. Third, 14 of the 23 studies were from China, nine were from abroad, and the languages involved only English and Chinese, which may lead to selection bias and reduce the validity of the research results.
Ultimately, this study demonstrated that miRNAs effectively forecast CRC with precision. In view of the limited number of available tests, it is necessary to further examine the validity and potential applicability of miRNA as a diagnostic indicator of CRC through multi-center, large sample and prospective studies.