激素受体阳性乳腺癌对布利祖马布敏感:MLH1变体1835del3病原性的证据
Henry G Kaplan1, Jeffrey R Whiteaker2, Brianna Nelson1
1Swedish Cancer Institute, Seattle, Washington.
Journal of the National Comprehensive Cancer Network : JNCCN
|August 29, 2023
概括
一种罕见的MLH1基因变异,以前的致病性尚未确定,与转移性乳腺癌患者的林奇综合征有关. 这一发现强调了基因评估对潜在的向治疗的重要性.
科学领域:
- 在瘤学瘤学.
- 遗传学 遗传学 是一个
- 癌症研究 癌症研究
背景情况:
- 雌激素/孕受体阳性,ERBB2阴性转移性乳腺癌.
- 患者呈现出进展性疾病,尽管多次治疗.
- 鉴定出生殖系MLH1变种 (1835del3),致病性不明.
研究的目的:
- 为了研究MLH1 1835del3生殖系变异的致病性.
- 探索这种MLH1变体,林奇综合征和转移性乳腺癌免疫治疗反应之间的潜在联系.
- 突出基因评估在非典型癌症呈现中的重要性.
主要方法:
- 一个转移性乳腺癌患者的案例研究,该患者患有生殖系MLH1变种.
- 在瘤组织中对MLH1进行免疫组织化学染色.
- 细菌和瘤遗传分析,包括失失异性 (LOH) 和微观卫星不稳定性 (MSI) 测试.
- 患病亲属的家族病史和遗传研究.
- 对 pembrolizumab 的治疗反应的临床评估.
主要成果:
- 患者,尽管之前的治疗失败,经历了戏剧性的>5年对 pembrolizumab.
- 瘤分析显示MLH1区域LOH,高MSI和高瘤突变负担.
- 家庭研究证实了MLH1 1835del3变体在多个亲属身上,包括患有结肠癌的人.
- 确定的MLH1变种存在于患有结肠癌的受影响的亲属中.
结论:
- LOH,MSI,高瘤突变负担,家族病史和对免疫治疗的反应的组合支持MLH1 1835del3变体作为病原体.
- 这种情况表明,在转移性乳腺癌患者中,林奇综合征的表现不常见.
- 医生应考虑在意想不到的临床场景中对潜在的向疗法进行遗传变异评估.
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