Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation;
Sun Yat-sen Memorial Hospital;
Sun Yat-sen University;
Department of Radiotherapy;
Sun Yat-sen Memorial Hospital;
Sun Yat-sen University;
Department of Medical Oncology;
Sun Yat-sen Memorial Hospital;
Sun Yat-sen University;
Pancreatic; ductal; adenocarcinoma; Circulating; tumor; cells; Epithelialmesenchymal; transition; Metastasis; Neutrophil-to-lymphocyte; ratio;