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Y. Chen



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    MA 03 - Chemotherapy (ID 651)

    • Event: WCLC 2017
    • Type: Mini Oral
    • Track: Advanced NSCLC
    • Presentations: 1
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      MA 03.03 - Nedaplatin plus Docetaxel versus Cisplatin plus Docetaxel as First-Line Chemotherapy for Advanced Squamous Cell Carcinoma of the Lung (ID 8154)

      11:00 - 12:30  |  Author(s): Y. Chen

      • Abstract
      • Presentation
      • Slides

      Background:
      A previous phase III randomized trial improved overall survival of patients with advanced or relapsed squamous cell lung carcinoma, compared with cisplatin plus docetaxel. However, evaluation of nedaplatin plus docetaxel’s effect on progression free survival (PFS) and time to progression (TTP) was limited.

      Method:
      To compare the efficacy and safety of nedaplatin plus docetaxel and cisplatin plus docetaxel. In this randomized, open-label, multicenter trial, patients diagnosed with advanced or relapsed squamous cell carcinoma pathologically or cytologically were enrolled in China. All the patients have no previous oncology medication. Patients were randomly assigned (1:1) to 80 mg/m² nedaplatin and 75 mg/m² docetaxel intravenously, or 75 mg/m² cisplatin and 75 mg/m² docetaxel, every 3 weeks for four cycles. The primary end points was PFS. Secondary endpoints included TTP and best overall response. The efficacy endpoint were analyzed in the intention-to-treat set and in the per protocol set. (Clinical trial number: NCT02088515; Funding:Jiangsu Simcere Pharmaceutical Co., Ltd.)

      Result:
      From December 2013 to December 2015, 286 patients were randomly assigned. Two hundred and eighty patients were included in the modified intention-to-treat analysis (141 in the nedaplatin group and 139 in the cisplatin group). In the intention-to-treat analysis set, median PFS was 4.63 months (95% confidence interval (CI), 4.43-5.10) in the nedaplatin group and 4.23 months (95% CI, 3.37-4.53) in the cisplatin group. PFS did not differ significantly between two groups (log-rank test, p =0.056). In per protocol set, PFS was significantly longer in the nedaplatin group (median 4.63 months, 95% CI, 4.43-5.10) than in the cisplatin group (median 4.27 months, 95% CI, 3.37-4.53; hazard ratio 0.760, 95% CI 0.585-0.989; p=0.039, log-rank test). Best overall response and TTP were improved in nedaplatin group than in cisplatin group (p= 0.002, median 4.57(4.30-4.80) vs 3.67(3.13-4.43) p= 0.020, respectively) in the intention-to-treat analysis set. Grade III or IV adverse events was more frequent in the cisplatin group than in the nedaplatin group (46 of 141 patients in the nedaplatin group and 62 of 139 in the cisplatin group, p=0.039). Grade 3 or worse nausea (0 vs 7) and fatigue (1 vs 3) were more frequent in the cisplatin group than in the nedaplatin group.

      Conclusion:
      There was no significant difference of PFS between cisplatin group and nedaplatin group. However, more adverse events was observed in the cisplatin group than in the nedaplatin group. Nedaplatin plus docetaxel could be a new treatment option for advanced or relapsed squamous cell lung cancer.

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    P1.01 - Advanced NSCLC (ID 757)

    • Event: WCLC 2017
    • Type: Poster Session with Presenters Present
    • Track: Advanced NSCLC
    • Presentations: 1
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      P1.01-037 - Circulating Tumor DNA Clearance During Treatment Associates with Improved Progression-Free Survival (ID 9653)

      09:30 - 16:00  |  Author(s): Y. Chen

      • Abstract

      Background:
      Therapeutic selection has been shown to lead to marked clonal evolution, thus revealing limitations in imaging scan as a monitoring method, which does not reflect biological processes at a molecular level. However, currently, response assessment of patients with non-small cell lung cancer (NSCLC) primarily relies on imaging scans, necessitating the development of methodologies for dynamic monitoring of treatment response. We evaluated ctDNA as a tumor clonal response biomarker.

      Method:
      We screened 831 advanced NSCLC patients with a mixture of prior treatment exposure by performing capture-based ultra-deep targeted sequencing on plasma samples using a panel consisting of 168 NSCLC-related genes. Eighty-six patients with driver mutations and a minimum of 2 evaluation points in addition to baseline were included for further analysis.

      Result:
      At baseline, 79.9% patients harbored at least one mutation from this panel; the remaining 20.1% had no mutation detected. Sixty-nine percent of patients (570/831) harbored driver mutation. Patients harboring 2 mutations or fewer at baseline had a median progression-free survival (PFS) of 7.4 months; in contrast, patients harboring more than 2 mutations had a median PFS of 3.8 months (P=6.6x10[-5 ]HR=0.34), suggesting a significant inverse correlation between number of mutations at baseline and PFS. Next, we evaluated the ability of ctDNA as a tumor clonal response biomarker in 86 patients with a minimum of 2 follow-ups. After a median follow-up of 314 days, 64 patients (74.4%) reached disease progression. During treatment, 46 patients, treated with either matched targeted therapy (MTT) or chemotherapy, had a minimum of one time of ctDNA clearance, occurring from 1.6 months to 7.5 months after the commencement of treatment, with a median PFS of 8.07 months, an overall response rate (ORR) of 41% and a disease control rate (DCR) of 93%. Median overall survival (OS) for this group has not reached. In contrast, 40 patients who had consistent detectable ctDNA throughout the course of treatment had a median PFS of 3.47months, a median OS of 425 days, an ORR of 20% and a DCR of 53%. Our data revealed that patients with a minimum of one time ctDNA clearance are associated with a better ORR (p=0.05), DCR (p=5.9x10[-5]), a longer PFS (p=5.4x10[-10 ]HR=0.21) and OS (p=2.3x10[-5 ]HR=0.21), regardless the type of treatment commenced and the time of evaluation.

      Conclusion:
      This real world study comprising a heterogeneous population reveals the predictive and prognostic value of ctDNA and warrants further investigations to explore its clearance as a surrogate endpoint of efficacy.