JCO:Cabozantinib或可改善晚期前列腺癌患者PFS

2012-12-11 JCO JCO

       一项关于新药物cabozantinib ( Cometriq)用于去势抵抗性前列腺癌(CRPC)治疗的研究报告被称为“史无前例”。相关的研究结果在线发表在11月19日的《临床肿瘤学杂志(JCO)》上。Cabozantinib是一种口服的多受体酪氨酸激酶抑制剂,作用对象包括RET,MET,和VEGFR2,于11月29日被FDA批准用于甲状腺髓样癌

       一项关于新药物cabozantinib ( Cometriq)用于去势抵抗性前列腺癌(CRPC)治疗的研究报告被称为“史无前例”。相关的研究结果在线发表在11月19日的《临床肿瘤学杂志(JCO)》上。Cabozantinib是一种口服的多受体酪氨酸激酶抑制剂,作用对象包括RET,MET,和VEGFR2,于11月29日被FDA批准用于甲状腺髓样癌的治疗。

       该研究纳入了171例去势抵抗性前列腺癌患者,大部分患者(87%)有骨转移,46%患者接受过化疗(其中94%为多西紫杉醇化疗)。另外,39%的患者曾经或正在接受双磷酸盐治疗。所有患者初期每日服用100mg 的cabozantinib 。在12周时,根据实体瘤疗效评价标准(RECIST),显示病情稳定的31例患者被随机分配,14例接受cabozantinib,17例接受安慰剂。但是,根据观察到的cabozantinib活性,在较早的阶段即停止了随机分配。

       研究显示,72%随机接受cabozantinib的患者的软组织病灶部位出现消退,68%的可评估患者在骨扫描中出现改善,其中12%的患者出现完全消退。

服用Cabozantinib患者的骨骼扫描图
服用Cabozantinib患者的骨骼扫描图


       
该研究的主要终点是12周时病情稳定的患者的PFS(无进展生存期)。结果显示,cabozantinib组患者的平均PFS(95% CI, 10.7周至62.4周)同安慰剂组的平均PFS(95% CI, 5.4周至6.6周)相比,有显著改善(23.9周 vs 5.9周,RR, 0.12;P <0.001)。

       研究人员之后对可评价患者进行相关因素考察发现,67%的可评价患者骨疼痛得到改善,56%的麻醉剂使用有所下降。
该研究中最常见的3级不良反应为疲劳(16%),高血压(12%),及手足综合征(8%),最常见的严重不良反应为肺栓塞(6%),脱水(5%)和呕吐(5%)。

       不过该研究的作者David C. Smith教授表示目前还不应该据此研究结果改变临床实践,Cabozantinib在临床试验外还不能用于CRPC的治疗,应该及时开展3期临床试验进行深入研究。

 

Purpose 
Cabozantinib (XL184) is an orally bioavailable tyrosine kinase inhibitor with activity against MET and vascular endothelial growth factor receptor 2. We evaluated the activity of cabozantinib in patients with castration-resistant prostate cancer (CRPC) in a phase II randomized discontinuation trial with an expansion cohort.
Patients and Methods 
Patients received 100 mg of cabozantinib daily. Those with stable disease per RECIST at 12 weeks were randomly assigned to cabozantinib or placebo. Primary end points were objective response rate at 12 weeks and progression-free survival (PFS) after random assignment.
Results 
One hundred seventy-one men with CRPC were enrolled. Random assignment was halted early based on the observed activity of cabozantinib. Seventy-two percent of patients had regression in soft tissue lesions, whereas 68% of evaluable patients had improvement on bone scan, including complete resolution in 12%. The objective response rate at 12 weeks was 5%, with stable disease in 75% of patients. Thirty-one patients with stable disease at week 12 were randomly assigned. Median PFS was 23.9 weeks (95% CI, 10.7 to 62.4 weeks) with cabozantinib and 5.9 weeks (95% CI, 5.4 to 6.6 weeks) with placebo (hazard ratio, 0.12; P < .001). Serum total alkaline phosphatase and plasma cross-linked C-terminal telopeptide of type I collagen were reduced by ≥ 50% in 57% of evaluable patients. On retrospective review, bone pain improved in 67% of evaluable patients, with a decrease in narcotic use in 56%. The most common grade 3 adverse events were fatigue (16%), hypertension (12%), and hand-foot syndrome (8%).
Conclusion 
Cabozantinib has clinical activity in men with CRPC, including reduction of soft tissue lesions, improvement in PFS, resolution of bone scans, and reductions in bone turnover markers, pain, and narcotic use.

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    2013-02-18 lidong40
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    2012-12-12 jeanqiuqiu
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    2012-12-12 闆锋旦

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