TY - JOUR
T1 - Oral contraceptive use and risk of gestational trophoblastic tumors
AU - Palmer, Julie R.
AU - Driscoll, Shirley G.
AU - Rosenberg, Lynn
AU - Berkowitz, Ross S.
AU - Lurain, John R.
AU - Soper, John
AU - Twiggs, Leo B.
AU - Gershenson, David M.
AU - Kohorn, Ernest I.
AU - Berman, Michael
AU - Shapiro, Samuel
AU - Rao, R. Sowmya
PY - 1999/4/7
Y1 - 1999/4/7
N2 - Background: Gestational trophoblastic disease refers to a spectrum of rare benign and malignant gynecologic disorders whose pathogenesis is not well understood. Recent studies from China and the United States have raised the hypothesis that long-term use of oral contraceptives before conception may increase the risk of gestational trophoblastic tumors. A multicenter case-control study of gestational trophoblastic tumors was undertaken to test this hypothesis. Methods - Telephone interviews were conducted with 235 case patients, including 50 with geStational choriocarcinoma, and 413 control subjects matched on recentness of pregnancy, age at pregnancy, and area of residence. Relative risks (odds ratios) were computed by conditional logistic regression. Reported P values are two-sided. Results: The relative risk estimate for ever having used oral contraceptives before the index pregnancy was 1.9 (95% confidence interval [CI] = 1.2-3.0), and the risk increased with duration of use (P for trend = .05). The estimate was highest for women who used oral contraceptives during the cycle in which they became pregnant (relative risk = 4.0; 95% CI = 1.6-10), but there was no consistent pattern according to the time interval since last use. Separate analyses of choriocarcinoma and persistent mole yielded similar results, i.e., the relative risk estimates for oral contraceptive use were 2.2 (95% CI = 0.8- 6.4) and 1.8 (95% CI = 1.0-3.0), respectively. Control for the number of sexual partners, which was independently associated with risk (P for trend = .05), did not materially change the results. Conclusions: This study, the largest to date, indicates that long duration of oral contraceptive use before conception increases the risk of gestational trophoblastic tumors. These findings may provide clues to the pathogenesis of this rare disease. Changes in use of oral contraceptives are not warranted, however, because the incidence attributable to oral contraceptive use is very low.
AB - Background: Gestational trophoblastic disease refers to a spectrum of rare benign and malignant gynecologic disorders whose pathogenesis is not well understood. Recent studies from China and the United States have raised the hypothesis that long-term use of oral contraceptives before conception may increase the risk of gestational trophoblastic tumors. A multicenter case-control study of gestational trophoblastic tumors was undertaken to test this hypothesis. Methods - Telephone interviews were conducted with 235 case patients, including 50 with geStational choriocarcinoma, and 413 control subjects matched on recentness of pregnancy, age at pregnancy, and area of residence. Relative risks (odds ratios) were computed by conditional logistic regression. Reported P values are two-sided. Results: The relative risk estimate for ever having used oral contraceptives before the index pregnancy was 1.9 (95% confidence interval [CI] = 1.2-3.0), and the risk increased with duration of use (P for trend = .05). The estimate was highest for women who used oral contraceptives during the cycle in which they became pregnant (relative risk = 4.0; 95% CI = 1.6-10), but there was no consistent pattern according to the time interval since last use. Separate analyses of choriocarcinoma and persistent mole yielded similar results, i.e., the relative risk estimates for oral contraceptive use were 2.2 (95% CI = 0.8- 6.4) and 1.8 (95% CI = 1.0-3.0), respectively. Control for the number of sexual partners, which was independently associated with risk (P for trend = .05), did not materially change the results. Conclusions: This study, the largest to date, indicates that long duration of oral contraceptive use before conception increases the risk of gestational trophoblastic tumors. These findings may provide clues to the pathogenesis of this rare disease. Changes in use of oral contraceptives are not warranted, however, because the incidence attributable to oral contraceptive use is very low.
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U2 - 10.1093/jnci/91.7.635
DO - 10.1093/jnci/91.7.635
M3 - Article
C2 - 10203284
AN - SCOPUS:0033531766
SN - 0027-8874
VL - 91
SP - 635
EP - 640
JO - Journal of the National Cancer Institute
JF - Journal of the National Cancer Institute
IS - 7
ER -