生殖轉變對乳癌具有重要意義。
女性受早發性癌症的影響特別嚴重，部分原因是乳癌是最常見的癌症類型之一。
Reproductive shifts are significant for breast cancer.
Women are disproportionately affected by early-onset cancer, in part because breast cancer is one of the most common types.
美國國家癌症研究所發布的報告顯示，2010年至2019年間，美國50歲以下人群中14種癌症的發生率上升，她的經歷的重要性由此凸顯。
肥胖、飲酒和不良飲食與早發性癌症之間存在著相當強的證據：美國「早發性」癌症（通常定義為發生在50歲以下成年人身上的癌症）的發生率不斷上升
多年來，研究和新聞報導一直指出「早發性」癌症（通常定義為發生在50歲以下成年人身上的癌症）的發生率不斷上升。但這種趨勢在不同時間和地點，以及十幾種癌症類型（包括乳癌、大腸癌、腎癌、胰臟癌、胃癌、睪丸癌和子宮癌）的廣泛性終於逐漸清晰起來。
篩檢力度加大和檢測方法改善或許可以解釋部分癌症發生率上升的原因。但科學家表示，有跡象表明，還有其他因素正在發生。他們正在加緊努力，試圖找出其中的奧秘。
幾十年前開始的生活方式改變可能也扮演了一定角色。
癌症研究人員經常指出一個歷史轉折點：20世紀50年代。
儘管如此，曹博士表示，肥胖、飲酒和不良飲食與早發性癌症之間存在著相當強的證據。這些是人口層面的趨勢，反映了我們共同的環境和暴露。
the National Cancer Institute published a report showing that, between 2010 and 2019, rates of 14 cancers increased among people under 50 in the United States, the significance of her experience came into focus.
For years, studies and news articles have noted rising rates of “early-onset” cancers, generally defined as those occurring in adults under 50 years old. But the breadth of the trend over time and place, and across more than a dozen cancer types — including breast, colorectal, kidney, pancreatic, stomach, testicular and uterine cancer — is finally becoming clear.
More screening and better detection probably explain some of the rise. But scientists say there are signs that something else, something more, is going on. Increasingly, they are marshaling their efforts to discover what that is.
Lifestyle changes that began decades ago may play a role.
Cancer researchers often point to a historical inflection point: the 1950s.
Still, the evidence linking obesity, alcohol use and poor diet to early-onset cancer is quite strong, Dr. Cao said. These are population-level trends that reflect our collective environment and exposures.
