The impact of uterine adenomyosis on the histopathological risk factors and survival in patients with endometrial adenocarcinoma.

A retrospective cohort study was performed on patients diagnosed with endometrial adenocarcinoma (EC) during a 9-year period to investigate the impact of co-existing adenomyosis on patients with EC. Group A included women with EC and adenomyosis and Group B EC cases without the presence of adenomyosis. Group A was more likely to have early-stage disease, tumours without deep myometrial invasion, low-grade tumours and tumours with negative lymphovascular space invasion when compared to Group B ( = 0.012,  = 0.004,  < 0.001,  = 0.02). There were no statistically significant difference between Group A and Group B for lymph node metastasis ( = 0.064). There was no significant relation between the adenomyosis and survival outcomes in the multivariant analysis ( = 0.437). As a conclusion, patients with adenomyosis were more likely to accompany good histopathologic prognostic factors. Multivariate analysis showed no significant effect of adenomyosis on recurrence and survival parameters.IMPACT STATEMENT Adenomyosis is one of the most common accompanying benign histopathological findings of type 1 endometrial carcinomas (EC). Adenomyosis comprises some characteristics similar to malignant tumours, such as invasion, abnormal tissue growth and angiogenesis. Despite concerns have arisen due to both their high incidence and similar molecular links, the possible relation between EC and adenomyosis is still not well grounded. We presented a 9-year period retrospective cohort of a tertiary referring single centre and evaluated the prognostic effect of adenomyosis in patients with EC as well as the survival outcomes of these patients. The co-occurrence of adenomyosis was more likely to accompany early-stage (stages 1-2) disease, low-grade tumours (grades 1-2) and tumours with negative LVSI in patients with EC. However, multivariate and survival analysis showed no significant effect of adenomyosis on recurrence and survival parameters. Based on these findings, we suggest that the presence of adenomyosis should not be considered as a prognostic factor in EC. Our results support the overriding opinion about the prognostic value of co-occurrence of adenomyosis and EC. However, further studies exploring the molecular and genomic markers in these two groups are needed to uncover the exact relation of adenomyosis on the prognosis of EC.