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Mark A Socinski

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    P1.16 - Treatment of Early Stage/Localized Disease (Not CME Accredited Session) (ID 948)

    • Event: WCLC 2018
    • Type: Poster Viewing in the Exhibit Hall
    • Track:
    • Presentations: 1
    • Moderators:
    • Coordinates: 9/24/2018, 16:45 - 18:00, Exhibit Hall
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      P1.16-04 - Outcomes of Patients < 70 or ≥70 Years of Age in PACIFIC (ID 13012)

      16:45 - 18:00  |  Presenting Author(s): Mark A Socinski

      • Abstract
      • Slides


      In the Phase 3 PACIFIC study of durvalumab versus placebo in patients with stage III, unresectable NSCLC without progression after concurrent chemoradiotherapy (cCRT), the co-primary endpoint PFS was significantly longer with durvalumab (stratified HR 0.52, 95% CI, 0.42–0.65; P<0.0001). In a prespecified analysis, PFS benefit with durvalumab was observed regardless of a 65-year age cutoff. However, median age at NSCLC diagnosis is 70 (CA Cancer J Clin, 2014). We therefore performed subgroup analyses to explore outcomes using a 70-year age cutoff.

      a9ded1e5ce5d75814730bb4caaf49419 Method

      PACIFIC (NCT02125461) was a Phase 3, randomized, double-blind, all-comers study of patients with WHO PS 0/1 who did not progress following ≥2 cycles of platinum-based cCRT. Patients were stratified by age, sex, and smoking history and randomized (2:1) 1–42 days after cCRT to receive durvalumab 10 mg/kg IV Q2W or placebo up to 12 months. Co-primary endpoints were PFS (BICR, RECIST v1.1) and OS (not available). Secondary endpoints included ORR, time to death/distant metastasis (TTDM), and safety. Between-treatment endpoint comparisons were performed for patients <70 and ≥70 years.

      4c3880bb027f159e801041b1021e88e8 Result

      As of Feb 13, 2017, 713 patients were randomized; 78% and 22% were <70 and ≥70 years, respectively. Baseline patient and tumor characteristics were generally well balanced across subgroups. However, patients ≥70 were more likely to be male, have PS 1, and, within the placebo arm, to be Asian. Older patients more commonly received carboplatin-based CT than younger patients. Durvalumab demonstrated PFS benefit compared with placebo, regardless if patients were <70 years (median 16.9 vs 5.6 months, HR=0.53, 95% CI: 0.42–0.67) or ≥70 years (median 12.3 vs 6.1 months, HR=0.62, 95% CI: 0.41–0.95). Durvalumab improved TTDM (<70 years: HR=0.53, 95% CI: 0.39–0.71; ≥70 years: HR=0.66, 95% CI: 0.39–1.13) and ORR (<70 years: 27.6% vs 15.4%; ≥70 years: 31.9% vs 17.6%) regardless of age. Younger patients on durvalumab received treatment longer (median total duration 45.5 vs 36.0 weeks). Regardless of treatment, older patients discontinued more due to AEs (durvalumab: 22.0% vs 13.7%; placebo: 16.1% vs 7.8%) and had more grade 5 AEs (durvalumab: 10.9% vs 2.7%; placebo: 9.1% vs. 4.5%). Among patients receiving durvalumab, older patients experienced more all-cause SAEs (42.6% vs 24.9%) and grade 3/4 AEs (41.6% vs 29.4%) but fewer AESIs (56.4% vs 67.9%) than younger patients.

      8eea62084ca7e541d918e823422bd82e Conclusion

      Patients achieved clinical benefit with durvalumab regardless of age. Increased AEs/SAEs observed in older patients across treatments may reflect age/cCRT related morbidity.


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