“…They concluded, in agreement with other studies, that asthenozoospermic men were more prone to these damaging parameters compared with normozoospermic infertile men, who in turn presented an increased level of cytogenetic damage compared with fertile men (10,11). Other studies reported that infertile men with varicocele seem to present increased reactive oxygen species (ROS) levels in semen and in the spermatic vein and consequently elevated levels of DNA damage, apoptosis, and, hence, malfunctions in spermatogenesis (12)(13)(14)(15)(16)(17)(18).…”