To provide a method for acquisition of data able to serve as an index for determining the likelihood that an ovarian endometriosis cyst is cancerous. [Solution] This data acquisition method for determining the likelihood that an ovarian endometriosis cyst is cancerous includes an iron concentration measurement step for measuring the iron concentration in the cystic fluid of the ovarian endometriosis cyst. This diagnostic device for diagnosing the likelihood that an ovarian endometriosis cyst is cancerous is provided, at a minimum, with an iron concentration measurement unit for measuring the iron concentration in the cystic fluid of the ovarian endometriosis cyst.本發明可提供一種方法，其用以取得可成為用以判斷子宮內膜異位性卵巢囊腫致癌可能性之指標的資料。用以判斷子宮內膜異位性卵巢囊腫致癌可能性之資料取得方法包含用以測定上述子宮內膜異位性卵巢囊腫之嚢胞液中之鐵濃度的鐵濃度測定步驟。
