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Differentiating
ovarian tumors based on developmental pathway may further enhance our
understanding of the disease. Traditionally, ovarian cancers were
thought to arise from the ovarian surface epithelium; however, recent
evidence suggests that some tumors originate in the fallopian tube. We
classified cases in a population-based case–control study (New England
Case–Control [NECC] Study) and two cohort studies (Nurses' Health Study
[NHS]/Nurses' Health Study II [NHSII]) by tumor dominance, a proxy for
tissue of origin. Dominant tumors (likely ovarian origin) are restricted
to one ovary or are at least twice as large on one ovary compared to
the other. Ovarian cancer risk factors were evaluated in relation to
dominant and nondominant tumors (likely tubal origin) using polytomous
logistic regression (NECC) or competing risks Cox models (NHS/NHSII).
Results were combined using random-effects meta-analyses. Among 1,771
invasive epithelial ovarian cancer cases, we observed 1,089 tumors with a
dominant mass and 682 with no dominant mass. Dominant tumors were more
likely to be mucinous, endometrioid or clear cell, whereas nondominant
tumors were more likely to be serous. Tubal ligation, two or more
births, endometriosis and age were more strongly associated with
dominant tumors
(rate ratio [RR] = 0.60, 0.83, 1.58 and 1.37, respectively) than nondominant tumors (RR = 1.03, 0.93, 0.84 and 1.14, respectively; p-difference = 0.0001, 0.01, 0.0003 and 0.01, respectively). These data suggest that risk factors for tumors putatively arising from ovarian versus fallopian tube sites may differ; in particular, reproductive factors may be more important for ovarian-derived tumors. As this is the first study to evaluate ovarian cancer risk factors by tumor dominance, these results need to be validated by other studies.
(rate ratio [RR] = 0.60, 0.83, 1.58 and 1.37, respectively) than nondominant tumors (RR = 1.03, 0.93, 0.84 and 1.14, respectively; p-difference = 0.0001, 0.01, 0.0003 and 0.01, respectively). These data suggest that risk factors for tumors putatively arising from ovarian versus fallopian tube sites may differ; in particular, reproductive factors may be more important for ovarian-derived tumors. As this is the first study to evaluate ovarian cancer risk factors by tumor dominance, these results need to be validated by other studies.
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Thursday, February 11, 2010
Abstract: Risk factors for epithelial ovarian cancer by tumor dominance, a surrogate for cell of origin -Cancer Prevention Research
"Although limited by small case numbers, our results suggest that tubal ligation may be more strongly associated with tumors of ovarian origin, while family history of ovarian cancer primarily increases risk of tumors of tubal origin. Characterizing risk factor relationships by tumor dominance may elucidate how these exposures alter risk and help to improve prevention efforts."
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