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Bo Yan

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    Mini Oral session II (ID 63)

    • Event: ELCC 2019
    • Type: Mini Oral session
    • Track:
    • Presentations: 1
    • Moderators:
    • Coordinates: 4/11/2019, 16:40 - 17:40, Room C
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      117O - Racial disparities in characteristics and prognosis in Asian versus white patients receiving atezolizumab: An ancillary analysis of POPLAR and OAK studies (ID 339)

      16:40 - 17:40  |  Author(s): Bo Yan

      • Abstract
      • Presentation
      • Slides


      Racial differences in characteristics and prognosis of Asiatic and White patients receiving immunotherapy have not been well described.

      a9ded1e5ce5d75814730bb4caaf49419 Methods

      We studied 390 patients from the POPLAR and OAK studies who received atezolizumab with evaluable biomarker parameters retrieved from a subsequent blood-based study. The differences of Asians versus Whites in baseline characteristics, outcomes and genetic mutations of atezolizumab therapy were assessed.

      20c51b5f4e9aeb5334c90ff072e6f928 Results

      Asiatic and White patients differed in characteristics including smoking history, baseline sum of the longest diameters (BLSLD), EGFR mutation frequency, programmed death-ligand 1 (PD-L1) expression and blood-based tumor mutational burden (bTMB) level. Overall survival (OS) was longer in Asians compared with Whites before (median OS: 18.7 vs. 11.1 mo; P = 0.005) and after (median OS: 20.9 vs. 12.6 mo; P = 0.005) propensity score matching (PSM). Race was an independent prognostic factor for OS (Asian vs White: HR 0.647, 95% CI 0.447-0.936, P = 0.021) in addition to performance status (PS), histology, BLSLD, and number of metastatic sites. The objective response rate (ORR) for Asians and Whites was 8.2% and 17.1%, respectively and disease control rate (DCR) was 51.2% and 47.7%, respectively. The blood-based mutational landscape differentiated between Asians and Whites. In the overall population, mutations of STK11, EGFR, KEAP1, POLE, GRM3, ATM and STAG2 were associated with treatment response while mutations of TP53, KEAP1, APC, RB1, CREBBP, EPHA5 and STAG2 were associated with OS. Comparing the frequency of efficacy- or prognosis- related mutations, Asians had more EGFR mutations and less TP53 and STK11 mutations than Whites.

      fd69c5cf902969e6fb71d043085ddee6 Conclusions

      Asians and Whites differed in the clinicopathological features and mutational landscape which may explain the superior efficacy of atezolizumab in Asiatic patients with NSCLC. This study conveys implications for further studies on racial disparity in the treatment of immunotherapy.

      b651e8a99c4375feb982b7c2cad376e9 Legal entity responsible for the study

      The authors.

      213f68309caaa4ccc14d5f99789640ad Funding

      Shanghai Municipal Education Commission-Gaofeng Clinical Medicine Support (No. 20161434).

      682889d0a1d3b50267a69346a750433d Disclosure

      All authors have declared no conflicts of interest.


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