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Updated: Jan 24, 2026
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Author Spotlight: Demonstrating Systematic Endobronchial Ultrasound to New Endoscopists
Published on: August 11, 2023
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A landmark point analysis with cytotoxic agents for advanced NSCLC
Nobuyuki Yamamoto1, Yoshihiro Nambu, Toshio Fujimoto
1Shizuoka Cancer Center, Shizuoka, Japan.
Summary
Eight weeks after treatment initiation is a key landmark for assessing cytotoxic agents in advanced non-small cell lung cancer (NSCLC). This finding can optimize clinical trial design for better patient outcomes.
Area of Science:
- Oncology
- Clinical Trial Design
- Pharmacology
Background:
- Recent publications suggest an 8-week landmark for cytotoxic agents in advanced non-small cell lung cancer (NSCLC).
- Hypothesis: 8 weeks is a useful landmark for evaluating treatment efficacy in NSCLC.
- Goal: Optimize clinical trial design for cytotoxic agents in NSCLC to maximize patient benefit.
Purpose of the Study:
- To test the hypothesis that an 8-week landmark is useful for cytotoxic agents in advanced NSCLC.
- To assess the optimal design of clinical trials for NSCLC treatments.
- To identify a disease-specific landmark point for NSCLC clinical studies.
Main Methods:
- Landmark analyses were conducted on a phase II study of pemetrexed and a phase III Four-Arm Cooperative Study for advanced NSCLC.
- Included 806 patients receiving various chemotherapy regimens (pemetrexed, cisplatin, irinotecan, paclitaxel, carboplatin, gemcitabine, vinorelbine).
- Evaluated tumor shrinkage rates at 4 and 8 weeks in relation to patient survival.
Main Results:
- Tumor shrinkage at 8 weeks significantly correlated with longer survival in the pemetrexed study (p=0.043).
- Tumor shrinkage at 4 weeks did not correlate with survival (p=0.139).
- The Four-Arm Cooperative Study also identified 8 weeks as the optimal landmark (p=0.002), not 4 weeks (p=0.190).
Conclusions:
- An 8-week landmark is effective for evaluating cytotoxic agents in advanced NSCLC, regardless of therapy line.
- Results suggest a disease-specific landmark point for NSCLC.
- This finding may inform future phase II/III clinical trial designs for NSCLC cytotoxic agents, prompting earlier efficacy assessments.
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