KRT19 and neoplasm: Third, other predictive biomarkers, such as radiomics features [48], carcinoembryonic antigen (CEA) [49], cytokeratin 19 fragment (CYFRA21-1) [49], epidermal growth factor receptor (EGFR) [50], circulating tumor cells [51], and circulating cell-free DNA [52] were not analyzed in the current study.