NO levels:Controls: 8.2 ± 4.3μmol/L;Men with varicocele and normal SA:15.4 ± 0.3μmol/L(P<0.05 versus controls);Men with varicocele and oligozoospermia: 7.8 ± 4.0 μmol/L(P NS versus controls); 8-OHdG levels:Controls: 14.7 ± 8.3 μmol/L;Men with varicocele and normal SA:10.0 ± 5.4 μmol/L(P NS versus controls);Men with varicocele and oligozoospermia: 10.8 ± 7.5 μmol/L(P NS versus controls); SOD activity:Controls: 75.6 ± 13.1%;Men with varicocele and normal SA: 84 ± 6.7%(P<0.05 versus controls);Men with varicocele and oligozoospermia: 89.4 ± 4.4 %(P<0.05 versus controls). The gene discussed is SOD1; the disease is varicocele.