BC是中国女性发病率最高的恶性肿瘤,其中HER2+亚型约占20%至30%。尽管曲妥珠单抗(联合或不联合帕妥珠单抗)联合化疗已显著降低患者的复发风险,但多项临床研究亚组分析显示,伴有淋巴结阳性、尤其是存在≥4个淋巴结阳性的 HER2+ BC患者,其复发风险仍然居高不下。双靶向联合化疗辅助治疗HER2+ BC 对比仅含曲妥珠单抗的方案,可进一步降低复发风险,其中淋巴结阳性人群的获益最为显著。因此,探索更优的辅助治疗策略以改善这一患者人群的长期结局具有重要的临床意义。
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