“…With regards to sample sources, six studies [ 32 , 40 , 45 , 46 , 49 , 61 ] reported no information regarding the recruitment setting, while in the remaining studies patients, and/or caregivers were mainly recruited from outpatient departments ( n = 16), inpatient departments ( n = 11), home/home-based care units ( n = 10), and mixed settings ( n = 7). In terms of cancer sites, 29 studies focused on patients with mixed cancer site and/or their caregivers, 11 studies focused on specific patients with cancer and/or caregivers (3 studies on prostate cancer [ 57 , 69 , 73 ], 5 studies on breast cancer [ 41 , 48 , 58 , 60 , 75 ], and three on lung cancer [ 35 , 42 , 71 ]), while 10 other studies [ 47 , 50 , 51 , 53 , 59 , 64 , 66 , 68 ] reported no information about cancer types. The diagnostic criteria of advanced cancer were presented in 13 studies (13/50), with five studies [ 6 , 30 , 31 , 60 , 61 ] adopting the criteria of cancer with metastasis, and seven studies [ 9 , 41 , 42 , 45 , 58 , 63 , 75 ] using the stage III/IV criterion according to TNM staging system.…”