“…Among them, 13 studies [ 7 , 14 , 15 , 16 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 ] (4651 cases) used multivariable analysis and 4 studies [ 30 , 31 , 32 , 33 ] (1177 cases) used univariable analysis in survival outcome measurement. This meta-analysis analyzed multiple cancer types, including gastrointestinal cancer (3 gastric cancers [ 16 , 30 , 31 ], 1 hepatocellular carcinoma [ 28 ], 1 esophageal cancer [ 14 ], 1 gallbladder cancer [ 32 ], and 1 colorectal cancer [ 29 ]), head and neck cancer (1 head and neck cancer [ 22 ], 1 oropharyngeal cancer [ 26 ], 1 hypopharyngeal cancer [ 27 ], and 1 oral cancer [ 7 ]), soft tissue sarcoma (3 soft tissue sarcoma [ 21 , 23 , 33 ] and 1 neuroblastoma [ 24 ]), non-small-cell lung cancer [ 15 ] (n = 1), and prostate cancer [ 25 ] (n = 1). A total of 12 studies reported cancer stage according to the TNM staging system, while 6 studies reported stage according to other staging systems, including the French Federation of Cancer Centers Sarcoma Group grading system, the Barcelona Clinic Liver Cancer staging system, the Japanese Gastric Cancer Treatment Guidelines, and the International Neuroblastoma Staging System.…”