演題抄録

一般演題(口演)

開催概要
開催回
第52回・2014年・横浜
 

Survival outcome assessed according to tumor response and shrinkage pattern in patients with EGFR mutation-positive non-small cell lung cancer treated with gefitinib or erlotinib

演題番号 : O29-4

[筆頭演者]
Takeda Masayuki:1 
[共同演者]
Okamoto Isamu:2、Nakagawa Kazuhiko:1

1:Medical oncology, Faculty of Medicine, Kinki University、2:Center for Clinical and Translational Research, Faculty of Medicine, Kyushu University

 

Introduction: Somatic mutations in the epidermal growth factor receptor gene (EGFR) are associated with a marked therapeutic response to EGFR-tyrosine kinase inhibitors (TKIs) in patients with advanced non-small cell lung cancer (NSCLC). Clinical indicators of the likely survival benefit of EGFR-TKI treatment in NSCLC patients with EGFR mutations have not been identified, however. We therefore evaluated progression-free survival (PFS) and overall survival (OS) according to tumor response and tumor shrinkage pattern in such patients.
Methods: Among 145 EGFR mutation-positive NSCLC patients treated with EGFR-TKIs, 68 individuals were selected for analysis.
Results: Of the 68 selected patients, 6 achieved a complete response (CR), 42 a partial response (PR), and 14 stable disease (SD). Both PFS and OS were significantly longer in patients who achieved a CR or PR than in those who experienced SD. Multivariate analysis showed that a response (CR or PR) to EGFR-TKIs was significantly associated with both PFS and OS. Among the CR/PR group, the median maximal tumor shrinkage relative to baseline was 56%, and the median time to response (TTR) was 4.2 weeks. The subsets of these patients who experienced rapid tumor regression (TTR of <4.2 weeks) or a high degree of tumor shrinkage (>56%) did not show a more favorable PFS or OS compared with those who experienced slow tumor regression or a low degree of tumor shrinkage.
Conclusion: Response (CR or PR) may represent the optimal surrogate for efficacy among EGFR mutation-positive NSCLC patients treated with EGFR-TKIs. (JTO in press)

キーワード

臓器別:肺・縦隔・胸膜

手法別:分子標的治療

前へ戻る