Br J Cancer:乳腺导管原位癌保乳手术后结合放疗的长期风险评估

2021-09-30 xiaozeng MedSci原创

自1990年代引入基于人群的乳房X光进行乳腺癌筛查以来,乳腺导管原位癌(DCIS)约占所有新确诊的乳腺癌的15%。

自1990年代引入基于人群的乳房X光进行乳腺癌筛查以来,乳腺导管原位癌(DCIS)约占所有新确诊的乳腺癌的15%。DCIS被认为是浸润性乳腺癌(IBC)的非专性前体,其是由乳腺导管系统的肿瘤上皮细胞组成。

由于DCIS具有侵入性的潜力,患者通常会通过乳房切除术或保乳手术(BCS)进行IBC治疗,并伴随着对整个乳房的放疗治疗(RT)。既往的临床试验显示,DCIS保乳手术后的放疗治疗可降低同侧乳房事件的发生率。该研究旨在基于人群的队列中评估DCIS治疗对同侧DCIS(iDCIS)和同侧浸润性乳腺癌(iIBC)的20年风险的影响。

该队列共包括了1989年至2004年期间在荷兰被诊断为DCIS且随访至2017年的所有女性。研究人员主要评估了BCS和BCS+RT治疗后iDCIS和iIBC的累积发生率,并通过多变量Cox回归模型估计DCIS治疗与iDCIS和iIBC发病风险的关联性。

根据经期和年龄划分的iDCIS和iIBC累积发病率

结果显示,BCS后任何同侧乳房事件的20年的累积发生率为30.6%,而BCS+RT治疗后仅为18.2%。相比于BCS+RT治疗,接受BCS治疗的女性患者在诊断后5年内发生iDCIS和iIBC的风险更高。进一步的分析随访10年后的患者信息发现,BCS与BCS+RT治疗的iDCIS和iIBC发病风险之间并无差异。


总而言之,在BCS后长达10年内,手术联合RT治疗与较低的iDCIS和iIBC的发病风险相关,但之后这种影响减弱。


原始出处:

van Seijen, M., Lips, E.H., Fu, L. et al. Long-term risk of subsequent ipsilateral lesions after surgery with or without radiotherapy for ductal carcinoma in situ of the breast. Br J Cancer (18 August 2021).

 

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