The Association between Primary Endometrioid Carcinoma of the Ovary and Synchronous Malignancy of the Endometrium

Table 1

(a) All epithelial ovarian cancers according to histological type and age at diagnosis.

Histological type of ovarian cancers	Patients 𝑛	%	Range	Median	Mean	% <50 years	% ≥50 years
Adenocarcinoma	1456	27.1	18–97	64	62.5	16.3	83.7
Clearcell carcinoma	236	4.4	28–88	58	59.2	23.7	76.3
Endometrioid carcinoma	460	8.6	20–86	59	58.8	25.4	74.6
Mucinous carcinoma∗	733	13.7	14–92	52	52.1	44.9	55.1
Serous carcinoma∗	1801	33.6	16–100	62	59.9	22.9	77.1
Others∗a	680	12.7	16–100	62	61.5	20.9	81.2
Total	5366	100	14–100	61	59.6	24.2	75.8

(b) Subset of epithelial ovarian cancers with malignancy in the endometrium.

Histological type of ovarian cancers	Patients 𝑛	%	Range	Median	Mean	% <50 years	% ≥50 years
Adenocarcinoma	49	31.2	34–85	59	59.8	22.5	87.5
Clearcell carcinoma	3	1.9	53–78	71	67.3	0.0	100.0
Endometrioid carcinoma	53	33.8	36–80	53	54.9	32.1	67.9
Mucinous carcinoma	7	4.5	49–73	57	59.7	14.3	85.7
Serous carcinoma∗	27	17.2	31–78	68	64.1	11.1	88.9
Othersa	18	11.5	46–78	55	57.9	22.2	79.8
Total	157	100	31–85	57	58.6	22.9	77.1

^∗borderline malignancies included.
^aincluding mixed carcinomas, anaplastic carcinoma, malignant Brenner tumor, carcinosarcoma, adenosquamous carcinoma, squameus cell carcinoma etc.