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非裔美国女性的雌激素受体阴性乳腺癌与生育和哺乳的关系。

Parity and lactation in relation to estrogen receptor negative breast cancer in African American women.

机构信息

Slone Epidemiology Center at Boston University, 1010 Commonwealth Avenue, Boston, MA, USA.

出版信息

Cancer Epidemiol Biomarkers Prev. 2011 Sep;20(9):1883-91. doi: 10.1158/1055-9965.EPI-11-0465. Epub 2011 Aug 16.

DOI:10.1158/1055-9965.EPI-11-0465
PMID:21846820
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3179178/
Abstract

BACKGROUND

Estrogen receptor (ER)-negative breast tumors and progesterone receptor (PR)-negative breast tumors occur more commonly in women of African ancestry. Recent research indicates that the effects of reproductive factors may differ by hormone receptor status. We assessed the relation of parity and lactation to incidence of ER(-)/PR(-) and ER(+)/PR(+) breast cancer in a cohort of African American women.

METHODS

From 1995-2009, 457 incident cases of ER(+)/PR(+) and 318 cases of ER(-)/PR(-) breast cancer were confirmed by review of pathology data among 59,000 African American women followed in the Black Women's Health Study through biennial questionnaires. HRs and two-sided 95% CIs for the incidence of breast cancer subtypes were derived from proportional hazards regression models that controlled for age, reproductive variables, and breast cancer risk factors.

RESULTS

Higher parity was associated with an increased risk of ER(-)/PR(-) breast cancer (HR = 1.48, 95% CI: 0.98-1.84 for 3+ versus 0 births, P(trend) = 0.009), and with a reduced risk of ER(+)/PR(+) cancer (HR = 0.53, 95% CI: 0.39-0.73 for 3+ versus 0 births, P(trend) = 0.0002). Among women who had breastfed, high parity was no longer associated with increased incidence of ER(-)/PR(-) breast, but the inverse association with ER(+)/PR(+) cancer persisted.

CONCLUSIONS

The higher incidence of ER(-)/PR(-) breast cancer in African American women may be explained in part by their higher parity and lower prevalence of breastfeeding relative to white women.

IMPACT

Increased breastfeeding may lead to a reduction in the incidence of this breast cancer subtype.

摘要

背景

雌激素受体(ER)阴性和孕激素受体(PR)阴性的乳腺癌在非裔美国女性中更为常见。最近的研究表明,生殖因素的影响可能因激素受体状态而异。我们评估了生育次数和哺乳与 ER(-)/PR(-)和 ER(+)/PR(+)乳腺癌发病风险的关系,研究对象为参加黑人女性健康研究的 59000 名非裔美国女性队列中的 457 例 ER(+)/PR(+)和 318 例 ER(-)/PR(-)乳腺癌新发病例。通过对黑人女性健康研究中通过两年一次的问卷进行随访的 59000 名非裔美国女性中 ER(+)/PR(+)和 318 例 ER(-)/PR(-)乳腺癌病例的病理数据进行审查,确定 ER(-)/PR(-)和 ER(+)/PR(+)乳腺癌亚型的发病率的 HR 和双侧 95%CI。通过比例风险回归模型,控制年龄、生殖变量和乳腺癌危险因素,得出乳腺癌亚型发病率的 HR 和双侧 95%CI。

方法

从 1995 年到 2009 年,通过对黑人女性健康研究中通过两年一次的问卷进行随访的 59000 名非裔美国女性中 ER(+)/PR(+)和 318 例 ER(-)/PR(-)乳腺癌病例的病理数据进行审查,确定 ER(-)/PR(-)和 ER(+)/PR(+)乳腺癌亚型的发病率的 HR 和双侧 95%CI。通过比例风险回归模型,控制年龄、生殖变量和乳腺癌危险因素,得出乳腺癌亚型发病率的 HR 和双侧 95%CI。

结果

生育次数较高与 ER(-)/PR(-)乳腺癌发病风险增加相关(HR = 1.48,95%CI:0.98-1.84,与 3+ 次与 0 次生育相比,P(趋势)= 0.009),与 ER(+)/PR(+)乳腺癌发病风险降低相关(HR = 0.53,95%CI:0.39-0.73,与 3+ 次与 0 次生育相比,P(趋势)= 0.0002)。在有哺乳史的女性中,高生育次数与 ER(-)/PR(-)乳腺癌发病率增加不再相关,但与 ER(+)/PR(+)乳腺癌发病风险降低的反比关系仍然存在。

结论

非洲裔美国女性中 ER(-)/PR(-)乳腺癌发病率较高,部分原因可能是她们的生育次数较高,母乳喂养率较低,而这两个因素白人女性中较为常见。

影响

增加母乳喂养可能会降低这种乳腺癌亚型的发病率。

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