Multiple previous randomized trials have demonstrated that BCT and mastectomy confer equivalent survival outcomes in women with earlystage breast cancer. However, it has been questioned whether these results apply to women aged younger than 40 years because few young women were included in these trials and other studies have shown young women to have a greater risk of having aggressive disease and a higher rate of local recurrence.

中文翻译：

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乳房切除术和保乳治疗对患有早期乳腺癌的年轻女性产生同等的结果

多项先前的随机试验表明，BCT 和乳房切除术在早期乳腺癌女性中具有相同的生存结果。然而，这些结果是否适用于 40 岁以下的女性受到质疑，因为这些试验中包括的年轻女性很少，其他研究表明年轻女性患侵袭性疾病的风险更大，局部复发率更高。