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一項新研究顯示，對孩子進行母乳喂養的母親，患卵巢癌的風險較低。而且喂母乳的時間越長，對母體免于患這種癌癥的保護也就越大。

眾所周知，卵巢癌以“無聲殺手”而著稱，很多患者僅出現如腫脹感等不明確癥狀，往往在診斷出來時病情已相當嚴重。在這項新的研究中，澳大利亞科學家把493名被診斷出患卵巢癌的婦女，與相似年齡的472名健康女性進行了對照研究。每位婦女都回答了有幾個孩子，以及每個孩子接受母乳喂養的時間有多長等問題。研究結果顯示，與對孩子進行母乳喂養不到7個月的婦女相比，那些讓孩子接受母乳喂養至少13個月的婦女，患卵巢癌的幾率減少了63%。研究還發現，母親所生的孩子越多，這種效果就越明顯。

發表在最近出版的《美國臨床營養雜志》上的這項研究稱，那些有3個孩子，且喂母乳時間總共達31個月以上的婦女，要比母乳喂養不到10個月的婦女患此癌的幾率低91%。研究人員指出，過去有許多研究已經證明，母乳喂養可降低母親患乳腺癌的風險，而這項新研究為母乳喂養對母親的健康有益這一觀點增加了新的佐證。

Ovarian cancer risk is reduced by prolonged lactation: a case-control study in southern China

Background: Ovarian cancer is an important neoplasm that is difficult to diagnose and treat; therefore, prevention is the preferable strategy. Growing evidence indicates a protective effect of breastfeeding on ovarian cancer risk.

Objective: The objective was to investigate the association between lactation and the risk of ovarian cancer among southern Chinese women.

Design: A case-control study was undertaken in Guangzhou, Guangdong Province, between August 2006 and July 2008. A validated and reliable questionnaire was used to obtain information on the months of lactation and number of children breastfed in a sample of 493 incident ovarian cancer patients and 472 hospital-based controls (mean age: 59 y). Logistic regression analyses were performed to assess the association between breastfeeding and the risk of ovarian cancer.

Results: Significant inverse dose-response relations were found for both duration of lactation and the number of children breastfed. The adjusted ORs were 0.09 (95% CI: 0.04, 0.19) for women with ≥31 mo of total lactation and those with ≤10 mo of lactation and 0.38 (95% CI: 0.27, 0.55) for women with ≥3 children breastfed compared with those with one child breastfed.