J Thorac Oncol:局部消融治疗可使NSCLC药物治疗长期获益

2012-12-03 J Thorac Oncol J Thorac Oncol

       一项小规模、单中心、回顾性研究显示,局部消融治疗可使接受酪氨酸激酶抑制剂治疗出现局部恶化的非小细胞肺癌(NSCLC)患者继续从该药物中获益。该研究结果发表在12月份的《胸部肿瘤学杂志》。(J Thorac Oncol 2012 Dec)        该研究的作者为美国科罗拉多大学癌症中心的An

       一项小规模、单中心、回顾性研究显示,局部消融治疗可使接受酪氨酸激酶抑制剂治疗出现局部恶化的非小细胞肺癌(NSCLC)患者继续从该药物中获益。该研究结果发表在12月份的《胸部肿瘤学杂志》。(J Thorac Oncol 2012 Dec

       该研究的作者为美国科罗拉多大学癌症中心的Andrew J. Weickhardt和他的同事们。研究中有25例进展期的癌基因相关NSCLC患者接受局部放疗或手术治疗后,持续接受crizotinib (Xalkori)或厄洛替尼(特罗凯)治疗,第二次恶化的中位时间是6.2个月。

       研究人员解释称,ALK+或EGFR-MT的NSCLC患者对crizotinib或厄洛替尼的靶向治疗反应良好,但是由于药物侵入中枢神经系统(CNS)不足或肿瘤的生物学变化,疾病的恶化是不可避免的。目前疾病恶化时的采取的措施是局部手术或放疗来缓解的同时改为全身细胞毒素化疗。

       然而,Weickhardt和他的同事们猜测, 局部消融治疗或可阻断恶化部位的抗肿瘤药物的扩散途径,从而使患者继续从靶向治疗中获益。

       因此,他们分析了2005--2011年间的38例接受crizotinib治疗的ALK+的NSCLC患者和27例接受厄洛替尼治疗的EGFR-MT的患者的数据。该试验纳入的患者均无软脑膜疾病,同时有4处或4处以下的中枢神经系统外疾病恶化(低度恶化),均有良好的体能状态。患者的中位年龄是58,大多数有腺癌。

       局部消融治疗最常见的形式是体部立体定向放疗,但是少数患者接受的是全脑放疗或手术等其他治疗方法。

       分析结果显示,28例ALK+患者和23例EGFR-MT患者出现疾病进展,第一次进展期是10.3个月。13例ALK+患者和5例EGFR-MT患者的初步恶化发生在中枢神经系统。这些患者局部消融治疗后接受靶向治疗的中位无疾病进展期(PFS)是7.1个月。初步恶化发生在其他器官如肺脏、骨骼,或淋巴结的患者的中位PFS为4个月。25例局部消融治疗后接受靶向治疗的患者中有6例患者的PFS为7个月。

       研究人员指出,首次进展时间在1年或1年以下的患者出现了不明显的更快进入二次进展的趋势(HR 3.45, 95% CI 0.92~2.99)。大部分的不良反应如脱发和记忆障碍,发生于接受全脑辐射的患者而不是立体定向放疗患者。

       Weickhardt和他的同事们观察到,EGFR-MT患者或ALK+阳性NSCLC患者分别接受厄洛替尼或crizotinib时,只有很少的低度恶化患者发生疾病进展。他们认为恶化部位接受局部消融治疗(LAT),并持续接受酪氨酸激酶抑制剂是合理的。

       研究者指出,几乎一半的ALK+患者初步恶化发生在CNS,在分析时,85%的患者还保持良好的反应。该研究结果显示,局部消融治疗联合crizotinib持续用药对这类患者“效果显著”。

       该研究的局限性包括不良反应数据的回顾性收集,非标准的CNS分级,及缺乏对照组。尽管如此,该研究为低度恶化的EGFR-MT和ALK+的NSCLC患者提供了一种全身治疗的替代疗法:LAT联合耐受良好的酪氨酸激酶抑制剂治疗。研究人员希望能有一项多中心前瞻性的有标准分级和特定治疗数据的临床试验进一步分析这种治疗方法的潜在作用。



Introduction
Many patients with oncogene-driven non–small-cell lung cancer (NSCLC) treated with tyrosine kinase inhibitors experience limited sites of disease progression. This study investigated retrospectively the benefits of local ablative therapy (LAT) to central nervous system (CNS) and/or limited systemic disease progression and continuation of crizotinib or erlotinib in patients with metastatic ALK gene rearrangement (ALK+) or EGFR-mutant (EGFR-MT) NSCLC, respectively.
Methods
Patients with metastatic ALK+ NSCLC treated with crizotinib (n = 38) and EGFR-MT NSCLC treated with erlotinib (n = 27) were identified at a single institution. Initial response to the respective kinase inhibitors, median progression-free survival (PFS1), and site of first progression were recorded. A subset of patients with either nonleptomeningeal CNS and/or four sites or fewer of extra-CNS progression (oligoprogressive disease) suitable for LAT received either radiation or surgery to these sites and continued on the same tyrosine kinase inhibitors. The subsequent median progression-free survival from the time of first progression (PFS2) and pattern of progression were recorded.
Results
Median progression-free survival in ALK+ patients on crizotinib was 9.0 months, and 13.8 months for EGFR-MT patients on erlotinib. Twenty-five of 51 patients (49%) who progressed were deemed suitable for local therapy (15 ALK+, 10 EGFR-MT; 24 with radiotherapy, one with surgery) and continuation of the same targeted therapy. Post-LAT, 19 of 25 patients progressed again, with median PFS2 of 6.2 months.
Discussion
Oncogene-addicted NSCLC with CNS and/or limited systemic disease progression (oligoprogressive disease) on relevant targeted therapies is often suitable for LAT and continuation of the targeted agent, and is associated with more than 6 months of additional disease control.

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    2012-12-25 yyj062
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    2012-12-04 chg122
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