“…Eleven studies were conducted in China, and six in Japan. Five different types of DSCs were assessed in this study, including esophageal carcinoma (EC) ( 4 , 8 , 13 , 17 , 18 ), gastric cancer (GC) ( 5 , 6 , 11 , 14 , 16 , 20 ), colorectal cancer (CRC) ( 10 , 12 , 19 ), hypopharyngeal carcinoma (HPC) ( 9 ), hepatocellular carcinoma (HCC) ( 7 , 15 ). The characteristics of the included studies are summarized in Table 1 .…”