Histologic type Cases (N) Ovary(S)* Ovary(O)* Endometriosis Serosa(T)* Serosa(U)* Clear cell carcinoma 1 0 0 0 1 Endometroid carcinoma 5 2 2 1 0 Serous carcinoma 8 4 3 0 1 Mixed type 5 5 0 0 0 Total 19 11 5 1 2

*Ovary (S): endometriosis existed with ovarian cancer at same site of ovary, Ovary (O): endometriosis and ovarian cancer present at different site of ovary, Serosa (T): endometriosis present on surface of the fallopian tube, Serosa (U): endometriosis present at surface of uterus

Table 3: The site of endometriosis foci with its coexisted ovarian cancer on same patient.