Objective: To evaluate the possible association of the glutathione S-transferase M1 (GSTM1) gene polymorphism with the susceptibility to endometriosis in women of Han nationality in Guangdong Province.
Methods: Polymerase chain reaction was used to identify the GSTM1 genotypes in 76 patients with endometriosis and 80 controls (surgical patients for gynecological problems other than endometriosis).
Results: The frequencies of the GSTM1 null genotypes in patients with endometriosis and controls were 65.8% and 46.3%, respectively, showing a significant difference between the endometriotic cohort and the control group (X(2)=6.03, P < 0.05). Individuals with GSTM1 null genotype were exposed to risks for endometriosis 2.24 times that of subjects without these genotypes OR=2.24, 95% CI=1.17-4.27 .
Conclusion: GSTM1 gene deletion might bea risk factor for endometriosis in women of Han nationality who are native residents in Guangdong Province.