PALB2逆转突变的出现作为乳腺癌中耐尼拉巴的抵抗机制:一个案例报告
Maako Kawamura1, Hiroshi Tada2, Hidekazu Shirota3
1Personalized Medicine Center, Tohoku University Hospital, Sendai, Japan.
Cancer science
|October 6, 2025
概括
本案例研究显示,患有转移性乳腺癌和PALB2突变的患者最初对PARP抑制剂治疗有反应. 由于PALB2的逆转突变,产生了耐药性,这凸显了基因组分析的必要性.
科学领域:
- 在瘤学瘤学.
- 遗传学 是一个遗传学.
- 药理学 药理学是指药理学的学科.
背景情况:
- 转移性乳腺癌 (MBC) 存在重大治疗挑战.
- 生殖系PALB2突变与乳腺癌风险增加和特定的治疗脆弱性有关.
- PARP 抑制剂 (PARPi) 对具有同源重组缺陷 (HRD) 的癌症有效,包括那些具有 PALB2 突变的癌症.
研究的目的:
- 用PARP抑制剂治疗的PALB2突变转移性乳腺癌患者的临床过程.
- 在此背景下,研究对PARP抑制剂获得性耐药性的机制.
- 突出液体活检对监测治疗反应和耐药性演变的有用性.
主要方法:
- 一个39岁的女性患有转移性乳腺癌和生殖系PALB2突变的案例研究.
- 用PARP抑制剂进行治疗.
- 通过瘤标志物和成像来监测临床反应.
- 在疾病进展时使用液体活检进行循环瘤DNA (ctDNA) 的纵向基因组分析.
主要成果:
- 观察到最初的临床益处是减少瘤标志物和改善PARP抑制剂治疗后的成像.
- 经过八个月的治疗,疾病的进展发生了.
- 液体活检在ctDNA中发现了三个不同的PALB2逆转突变.
- 这些突变恢复了同源重组 (HR) 功能,赋予了对PARP抑制剂的耐药性.
结论:
- PARP 抑制剂在 PALB2 突变的转移性乳腺癌中显示出治疗潜力.
- 获得的耐药性可以通过发展的二次突变恢复同源重组的出现.
- 液体活检是检测耐药机制和指导晚期癌症后续治疗策略的宝贵工具.
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