“…We summarized the characteristics in Table 1. Of all included studies, five were performed in the United States (7,31,33,34,40), four in Japan (32,36,39,44), and the remaining eight studies were conducted in Switzerland (35), Canada (37), France (38,45), Bulgaria (41), China (42), Germany (43), and Italy (46), respectively. In terms of the ICIs used, 11 studies reported on nivolumab (7, 31-36, 39, 42, 45, 46), 2 studies reported on pembrolizumab (41,44), and the remaining 4 studies did not specify the type of ICIs (37,38,40,43).…”