Serum levels of cancer antigen 125 before hormone replacement therapy are not associated with clinical outcome of frozen embryo transfer in women with adenomyosis

AIM: This retrospective study aimed to evaluate the predictive value of serum cancer antigen 125 (CA125) levels before hormone replacement therapy on pregnancy outcomes in women with adenomyosis undergoing frozen embryo transfer. METHODS: A total of 509 women with adenomyosis were screened and 84 patients receiving a total of 114 cycles of frozen embryo transfer were included, based on the inclusion and exclusion criteria. Patients were divided into two groups based on their CA125 levels (≤ or >35 IU/mL) before hormone replacement therapy. The basic characteristics and main outcomes of the two groups were compared. Receiver operating characteristic curve and subgroup analyses were also conducted. RESULTS: There were no significant differences in clinical outcomes of frozen embryo transfer cycles in patients with different serum CA125 levels before hormone replacement therapy. Receiver operating characteristic curve analysis demonstrated that CA125 levels before hormone replacement therapy were not predictive of clinical pregnancy outcomes. CONCLUSIONS: Serum CA125 levels before hormone replacement therapy are not associated with the clinical outcomes of frozen embryo transfer among women with adenomyosis.