Among the studies, nine [9, 12–19], six [17, 20–24], 14 [12, 17, 20, 23–33] and, 14 [23, 26–28, 30, 33–41] studies evaluated the relationships between PGG, PSM length, number of PSMs, pathologic stage of the tumor, and BCR, respectively. Here, BCR is linked to neoplasm.