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B. Gitlitz



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    MO13 - SCLC I (ID 118)

    • Event: WCLC 2013
    • Type: Mini Oral Abstract Session
    • Track: Medical Oncology
    • Presentations: 1
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      MO13.01 - Disease control rate at 8 weeks predicts subsequent survival in platinum-treated extensive stage small cell lung cancer (ES-SCLC): a patient level analysis of SWOG trials (ID 967)

      10:30 - 10:35  |  Author(s): B. Gitlitz

      • Abstract
      • Presentation
      • Slides

      Background
      Disease control rate (DCR) – the sum of partial (PR) and complete response (CR) plus stable disease (SD) – is a significant predictor of subsequent survival following platinum-based chemotherapy in patients with advanced non-small cell lung cancer (Lara, et al. JCO 2008). We evaluated whether this observation is also relevant in patients with platinum-treated ES-SCLC on investigational systemic therapy.

      Methods
      Updated patient-level data from recent SWOG trials in 2[nd] and/or 3[rd] line ES-SCLC (S0802: topotecan + aflibercept; S0435: sorafenib; and S0327: PS-341) were pooled. Landmark analysis was performed among patients still alive at 8 weeks for overall survival (OS) measured from the 8-week landmark. Association of clinical prognostic factors (including age, sex, platinum sensitivity status, number of prior chemo, weight loss, and LDH, among others) with DCR was assessed using logistic regression. A Cox proportional hazards model was used to assess the associations between DCR at the landmark time and subsequent OS, adjusted for prognostic factors.

      Results
      319 patients were included: median age = 63 years; male sex = 51%; PS 1 = 68%; weight loss > 5% = 29%; > 2 prior chemo = 16%; and elevated LDH = 43%. Only 8 patients had PR by RECIST for an overall response rate of 2.5%. Disease control at 8 weeks was observed in 74 patients (8 PR + 64 SD), for a DCR of 23.2%. Bivariate analysis of OS from the 8-week landmark revealed that only DCR (Hazard Ratio [HR] 0.53, p<0.0001) and elevated LDH (HR 1.69, p=0.001) were significantly associated with OS. Multivariable analysis showed that only DCR remained as an independent predictor of subsequent survival from the 8-week landmark (HR=0.58, p=0.002).

      Conclusion
      In this large 2[nd]- and 3[rd]-line ES-SCLC database, DCR at 8 weeks was found to be the strongest predictor of subsequent survival in patients receiving investigational therapy. Thus, DCR at 8 weeks should be considered for use as a surrogate clinical trial endpoint to screen for drug activity against ES-SCLC. These results have critical implications in the design of future prospective trials in ES-SCLC.

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