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OBJECTIVE: to determine GSTT1 and GSTM1 null genotype frequencies as well as CYP1A1 polymorphic allele frequencies in a group of women with endometriosis, and to compare these frequencies with those observed in a group without endometriosis (control), aiming at a possible identification of biomarkers of susceptibility to endometriosis. METHODS: a total of 50 women with suggestive clinical signs of endometriosis underwent videolaparoscopy and biopsies were evaluated histologically. Endometriosis was present in 25 women (case group). Negative results were found in 25 women (control group). GSTT1 and GSTM1 null genotypes were assessed by multiplex polymerase chain reaction (PCR). The investigation of the polymorphic allele of the gene CYP1A1 was performed by PCR-RFLP (restriction fragment length polymorphism). For statistical analysis, the Fisher exact test was used. RESULTS: in both groups, the deletion polymorphism frequencies presented values of 16% for the gene GSTT1 and of 44% for the gene GSTM1; therefore, the results did not show differences in the distribution of the GSTT1 and GSTM1 null genotypes among the studied groups. The allelic frequency for the m1 allele of the gene CYP1A1 was higher in the women with endometriosis (0.22), although not statistically significant, when compared to the control group (0.14). CONCLUSION: the results did not show an association between the evaluated polymorphisms and the endometriosis diagnosis.