Ovarian cancer rates after hysterectomy with and without salpingo-oophorectomy.
OBJECTIVE
To estimate ovarian and peritoneal cancer rates after hysterectomy with and without salpingo-oophorectomy for benign conditions.


METHODS
All patients after hysterectomy for benign disease from 1988 to 2006 in Kaiser Permanente Northern California, an integrated health organization. Incidence rates per 100,000 person-years were calculated.


RESULTS
Of 56,692 patients, the majority (54%) underwent hysterectomy with bilateral salpingo-oophorectomy; 7% had hysterectomy with unilateral salpingo-oophorectomy, and 39% had hysterectomy alone. There were 40 ovarian and eight peritoneal cancers diagnosed during follow-up. Median age at ovarian and peritoneal cancer diagnosis was 50 and 64 years, respectively. Age-standardized rates (per 100,000 person-years) of ovarian or peritoneal cancer were 26.7 (95% confidence interval [CI] 16-37.5) for those with hysterectomy alone, 22.8 (95% CI 0.0-46.8) for hysterectomy and unilateral salpingo-oophorectomy, and 3.9 (95% CI 1.5-6.4) for hysterectomy and bilateral salpingo-oophorectomy. Rates of ovarian cancer were 26.2 (95% CI 15.5-37) for those with hysterectomy alone, 17.5 (95% CI 0.0-39.1) for hysterectomy and unilateral salpingo-oophorectomy, and 1.7 (95% CI 0.4-3) for those with hysterectomy and bilateral salpingo-oophorectomy. Compared with women undergoing hysterectomy alone, those receiving an unilateral salpingo-oophorectomy had a hazard ratio (HR) for ovarian cancer of 0.58 (95% CI 0.18-1.9) and those undergoing bilateral salpingo-oophorectomy had an HR of 0.12 (95% CI 0.05-0.28).


CONCLUSIONS
The removal of both ovaries decreases the incidence of ovarian and peritoneal cancers. Removal of one ovary might also decrease the incidence of ovarian cancer but warrants further investigation.


METHODS
II.
Division of Gynecologic Oncology, Department of Obstetrics, Gynecology and Reproductive Sciences, Helen Diller Family Comprehensive Cancer Center, and the Division of Gynecology, Department of Obstetrics and Gynecology and Reproductive Sciences, University of California, San Francisco School of Medicine, San Francisco, the Division of Research, Kaiser Permanente, Oakland, the Division of Medical Oncology, Chao Comprehensive Cancer Center, University of California, Irvine-Medical Center, Chao Family Comprehensive Cancer Center, Orange, and the Division of Epidemiology, Stanford Cancer Center, Stanford University School of Medicine, Stanford, California.
John K
JK
Chan
Renata
R
Urban
Angela M
AM
Capra
Vanessa
V
Jacoby
Kathryn
K
Osann
Alice
A
Whittemore
Laurel A
LA
Habel
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002140:California / Q000453:epidemiology; D002277:Carcinoma / Q000453:epidemiology*; D005260:Female; D006801:Humans; D007044:Hysterectomy; D015994:Incidence; D008875:Middle Aged; D010051:Ovarian Neoplasms / Q000453:epidemiology*; D010052:Ovariectomy; D010534:Peritoneal Neoplasms / Q000453:epidemiology*; D012189:Retrospective Studies; D055815:Young Adult