To examine glutathione S-transferase M1 (GST M1) gene polymorphism and male infertility in Taiwanese patients with varicocele, 80 young male patients with varicocele (group 1), 62 young male patients with subclinical varicocele (group 2) and 60 normal young males (group 3) were recruited in this study.
Institute of Clinical Medicine, School of Medicine, National Yang-Ming University, No. 155 Li-Nong Street, Sec. 2, Taichung, Taiwan, Republic of China.