“…After excluding case reports, non-published materials, editorials, reviews, commentaries, conference abstracts, and animal experiments, as well as irrelevant-topic studies with the first browse of title and abstract, the full-text of 191 papers, were read in detail to determine the eligibility. Finally, a total of 26 studies published from 2000 to 2019 with 391 068 patients in PSA era were included in the current study ( Table 1, Stable 1), 12,15,18,19,[22][23][24][25][26][27][28][29][30][31][32][33][34][39][40][41][42][43][44][45][46][47] and the majority of these studies were of relatively high quality with seven or more stars according to the NOS assessment ( Table 1). Seven out of the 26 studies which provided the data on comparing clinicopathological characteristics between younger (age ≤ 50) and older (age > 50) patients were suitable for odds ratio (OR) meta-analyses (Table 2).…”