【ASCO2014】Ramucirumab+FOLFOX作为晚期胃/食管癌一线治疗?

发布时间:2014-05-27 浏览次数:1032次 来源: 作者:

Ramucirumab(RAM),一种抗-VEGFR2单克隆抗体,在3项2期试验中可提高之前已治疗过的胃/胃食管交界处(GEJ)腺癌患者的总生存期(OS)。本项研究是将RAM作为晚期胃癌或者食管腺癌(GE-AC)一线治疗的第一次评估。下面和大家提前分享这项研究。


研究方法:


未经处理的转移性或者局部晚期不能手术切除的GE-AC(PS≤1)患者,按照1:1随机分配到mFOLFOX+RAM(8mg/kg IV)组和安慰剂组(PL),q14d。主要终点是无进展生存期(PFS),利用80%范围检测HR 0.71(α=0.3)。次要终点包括OS,缓解率(PR),疾病控制率(DCR),和安全性。


研究结果:


2011年04月到2012年08月在美国47个网点招募了168例患者(RAM:84例 v PL:84例)。患者特征:年龄(65 v 60);男性(75% v 73%);胃(23% v 24%);GEJ(31% v 27%),食管(46% v 49%);转移性(95% v 94%)。中位PFS 6.4个月 v 6.7个月(HR 0.98[95% CI 0.69~1.37];P=0.89),OS为11.7个月 v 11.5个月(HR 1.08[95% CI 0.73~1.58])。


根据原发肿瘤位置进行亚组分析:对于食管腺癌来说,中位PFS为5.6个月 v 6.1个月(HR 1.30);对于胃/GEJ来说,PFS是8.7个月 v 7.1个月(HR 0.77[0.48~1.24];P=0.28),OS为14.6个月 v 12.5个月。在3个月时的PFS率在RAM v PL(89% v 75%;P=0.20)较高,而不是在第6,9,12个月。RR(CR,PR)45% v 46%。DCR(SD,CR,PR)85% v 67%(P=0.008)。


最常见的≥3级不良反应事件(AEs):中性粒细胞减少(27% v 36%),疲劳(18% v 15),神经病变(9% v 11%)。除了高血压,≥3级AEs是不常见的。


中位OX周期在小组见是相似的(8.5 v 9.5)。但是5-FU或者RAM/PL(均是9 v 11)的周期在RAM组较低。在RAM组中一线治疗因为非进展疾病(PD)停止更为常见:患者/医生决定(27% v 10%),AEs(21% v 6%)。


在探索性分析中,设限的PFS因非进展疾病一项治疗停止,PFS的HR支持RAM组(HR 0.76;P=0.194),主要在胃/GEJ患者中(PFS 9.3个月 v 7.6个月;HR 0.53[0.29~0.97];P=0.036)。


研究结论:


将RAM添加到FOLFOX方案中,不能改善中位PFS,但是显示3个月的PFS有差异,同时提高疾病控制率。在RAM v PL中较长的PFS在胃/胃食管交界处癌症患者中可以观察到。在RAM组中较高的非进展疾病停药率和较低的药物暴露可能会影响PFS评估。这些数据对于RAM治疗胃癌的临床发展至关重要。临床试验信息:NCT01246960


医脉通整理报道,转载请注明出处。


会议专题》》》2014年ASCO年会专题报道


阅读原文摘要


Ramucirumab (RAM) plus FOLFOX as front-line therapy (Rx) for advanced gastric or esophageal adenocarcinoma (GE-AC): Randomized, double-blind, multicenter phase 2 trial.(Abstract4004


Authors: Harry H. Yoon, Johanna C. Bendell, Fadi S. Braiteh, et al.


Session Type: General Poster Session


Background: RAM, an anti-VEGFR2 monoclonal antibody, improved overall survival (OS) in 2 phase 3 trials in patients (pts) with previously treated gastric/gastroesophageal junction (GEJ) AC. We report the first assessment of RAM as 1st-line Rx for GE-AC. 


Methods: Pts with untreated metastatic or locally advanced unresectable GE-AC (PS ≤1) were randomized 1:1 to mFOLFOX6 plus RAM (8 mg/kg IV) v placebo (PL), q14d. Primary endpoint was progression-free survival (PFS), with 80% power to detect HR 0.71 (α =.3). Secondary endpoints included OS, response rate (RR), disease control rate (DCR), and safety. 


Results: 168 pts (RAM 84 v PL 84) enrolled at 47 US sites, 04/11 – 08/12. Pt characteristics: age (65 v 60); male (75% v 73%); gastric (23% v 24%), GEJ (31% v 27%), esophageal (46% v 49%); metastatic (95% v 94%). Median PFS 6.4 v 6.7 m (HR 0.98 [95% CI 0.69 – 1.37]; p =.89) and OS 11.7 v 11.5 m (HR 1.08 [0.73-1.58]). Subgroup analyses by primary tumor location: for esophageal, median PFS was 5.6 v 6.1 m (HR 1.30); for gastric/GEJ, PFS was 8.7 v 7.1 m (HR 0.77 [0.48 – 1.24]; p =.28) and OS 14.6 v 12.5 m. PFS rate at 3 m was higher in RAM v PL (89% v 75%, p =.020), but not at 6, 9, or 12 m. RR (CR, PR) 45% v 46%. DCR (SD, CR, PR) 85% v 67% (p =.008). Most common grade ≥3 adverse events (AEs): neutropenia (27% v 36%), fatigue (18% v 15%), neuropathy (9% v 11%). Grade ≥3 AEs of special interest were uncommon, except hypertension. Median cycles of OX were similar among arms (8.5 v 9.5), but cycles of 5FU or RAM/PL (both 9 v 11) were lower in RAM arm. Rx discontinuation for non-progressive disease (PD) was more common in RAM: pt/physician decision (27% v 10%), AEs (21% v 6%). In exploratory analyses that censored PFS at Rx discontinuation for non-PD, HR for PFS favored RAM arm (HR 0.76; p =.194), mainly in gastric/GEJ pts (PFS 9.3 v 7.6 m; HR 0.53 [0.29 – 0.97]; p =.036). 


Conclusions: Addition of RAM to FOLFOX did not improve median PFS but showed PFS difference at 3 m and improved DCR. Longer PFS in RAM v PL was observed in gastric/GEJ cancer pts. A higher non-PD discontinuation rate and lower drug exposure in RAM arm may have impacted PFS assessment. These data are critical for clinical development of RAM in gastric cancer. Clinical trial information: NCT01246960.