“…Indeed, administration of perioperative chemotherapy is associated with improved DFS. 39,40 In our included studies, the two groups were comparable for perioperative treatment (Table 2); however, this varied within each study, in terms of regimens, duration, and timing of administration (neoadjuvant or adjuvant). Although patient-tailored treatment might have contributed to this variation, it may also be because studies enrolled patients over a long time frame of 20 years (Table 1), during which strategies of perioperative treatment have advanced.…”