Highlights
► Ovarian endometriosis is known to transform into ovarian cancer, but its etiology is not clarified.
► A stressful microenvironment within the endometriotic cyst may lead to cancer development.
► Ovarian clear cell carcinoma has unique gene expressions, which may serve as a molecular marker.
► Carcinogenic microenvironment affects the phenotype, character and gene expression of a cancer.
► We might be able to develop new treatment based on the analysis of the influence of microenvironment.
