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Paolo Bidoli



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    MA11 - Biomarkers of IO Response (ID 912)

    • Event: WCLC 2018
    • Type: Mini Oral Abstract Session
    • Track: Immunooncology
    • Presentations: 1
    • Moderators:
    • Coordinates: 9/25/2018, 10:30 - 12:00, Room 203 BD
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      MA11.05 - Indoleamine 2,3-Dioxygenase Expression in Non-Small-Cell Lung Cancer: Analyses of Prevalence, Clinical Correlations and Prognostic Impact (ID 13309)

      11:00 - 11:05  |  Author(s): Paolo Bidoli

      • Abstract
      • Presentation
      • Slides

      Background

      Indoleamine 2,3-dioxygenase-1 (IDO-1) is a cytosolic enzyme involved in the catabolism of tryptophan; IDO-1-related immune suppression is due to decreased tryptophan availability and to the generation of tryptophan metabolites, culminating in substantial suppression of T-lymphocytes. Here we investigate IDO-1 expression in a cohort of non-small-cell lung cancer (NSCLC) specimens, both in tumor cells and in immune infiltrate, with correlation of IDO-1 to PD-L1 expression, clinical patient demographics and outcomes.

      a9ded1e5ce5d75814730bb4caaf49419 Method

      A cohort of 1.200 NSCLC samples were obtained from 437 patients who underwent surgical lung resections at Austin Health, Melbourne, Australia. IDO-1 expression was evaluated by immunohistochemistry. Correlations were assessed using Spearman and Kendall tests. A Cox proportional hazards (PH) model was used to assess if overall survival (OS) was associated with IDO-1 positivity in univariate and multivariable settings.

      4c3880bb027f159e801041b1021e88e8 Result

      Samples from 437 patients were analyzed for IDO-1 expression, with 111 (25.4%) determined as positive (H-Score 1) and 326 patients (74.6%) as negative (H-Score: 0). IDO-1 expression was determined to be greater in tumor immune infiltrate, with 406 patients (93.8%) determined as positive, while just 27 (6.2%) were IDO-1 negative. There was a significant positive correlation between IDO-1 positive tumor cells and immune cells (0.2167, p < 0.001). Both continuous and binary versions of tumor H-Score showed a significant positive correlation with the amount of tumor immune infiltrate (0.1806 and 0.1698, p < 0.0001, respectively). None of the analyzed variables (age, sex, histology, stage, EGFR, KRAS and PD-L1 status) were found to display a significant correlation with IDO-1 positivity in tumor and immune cells. IDO-1 positivity in tumor cells was found to be significantly associated with OS in the univariate setting and in the multivariable model where variables age, sex, histology, stage, EGFR, KRAS and PD-L1 status were included [P-value = 0.009 and 0.021, respectively; HR: 0.72 (95% CI: 0.55-0.95)]. IDO-1 positivity in immune cells was found to be significantly associated with OS in the univariate setting and was borderline significant in the multivariable model [P-value = 0.006 and 0.053, respectively; HR: 0.798 (95% CI: 0.635-1.003)].

      8eea62084ca7e541d918e823422bd82e Conclusion

      To our knowledge, this is the most extensive analysis of IDO-1 expression in NSCLC patients reported in the literature. Our results suggest the possible prognostic role of IDO-1 expression in tumor and immune cells, highlighting the relevance of IDO-1 detection in tumor tissue. Since new compounds targeting IDO-1 are actually under investigation, the identification of potential prognostic and predictive biomarkers will be needed.

      6f8b794f3246b0c1e1780bb4d4d5dc53

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    P1.01 - Advanced NSCLC (Not CME Accredited Session) (ID 933)

    • Event: WCLC 2018
    • Type: Poster Viewing in the Exhibit Hall
    • Track:
    • Presentations: 2
    • Moderators:
    • Coordinates: 9/24/2018, 16:45 - 18:00, Exhibit Hall
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      P1.01-21 - Safety of Durvalumab Retreatment in Advanced NSCLC Patients Who Progressed Following Initial Disease Control In ATLANTIC (ID 12386)

      16:45 - 18:00  |  Author(s): Paolo Bidoli

      • Abstract
      • Slides

      Background

      In ATLANTIC, patients who completed a year of durvalumab (anti-PD-L1) treatment but later progressed off therapy were eligible for retreatment. We evaluated safety in these patients compared with the overall study population.

      a9ded1e5ce5d75814730bb4caaf49419 Method

      ATLANTIC (NCT02087423) was a Phase 2, open-label, single-arm trial in patients with Stage IIIB–IV NSCLC who had received ≥2 prior systemic treatment regimens, including one platinum-based. The study included three independent cohorts. In C1 (EGFR+/ALK+) and C2 (EGFR−/ALK−), enrollment was enriched for patients with ≥25% of tumor cells (TC) expressing PD-L1, while patients in C3 (EGFR−/ALK−) only had PD-L1 TC ≥90%. Patients received durvalumab 10 mg/kg q2w for ≤12 months. Patients who achieved and maintained disease control but then progressed after completing the initial 12-month treatment period were offered retreatment for a maximum of 12 months of further treatment. Safety and tolerability was a secondary outcome.

      4c3880bb027f159e801041b1021e88e8 Result

      As of November 7, 2017, of 442 patients in the ATLANTIC full analysis set, 102 (23.1%) had completed 12 months of initial treatment and 95 (21.5%) had disease control at the end of initial treatment. A total of 40 patients started retreatment. The median actual duration of exposure to durvalumab was 16.0 weeks (range 1–62; 40.1% of patients on treatment for ≥24 weeks) during initial treatment and 18.1 weeks (range 2–52; 37.5% of patients on retreatment for ≥24 weeks) during retreatment. The table shows safety during initial treatment and retreatment.

      Initial treatment (n=444)

      Retreatment phase (n=40)

      Cohort,* n (%)

      C1 (EGFR+/ALK+)

      111 (25.0)

      7 (17.5)

      C2 (EGFR−/ALK−)

      265 (59.7)

      26 (65.0)

      C3 (EGFR−/ALK−; TC ≥90%)

      68 (15.3)

      7 (17.5)

      Any TRAE, n (%)

      256 (57.7)

      19 (47.5)

      Grade ≥3 TRAEs

      42 (9.5)

      6 (15.0)

      TRAEs leading to death

      0

      2 (5.0)

      Serious TRAEs

      28 (6.3)

      4 (10.0)

      TRAEs leading to discontinuation

      10 (2.3)

      4 (10.0)

      Safety analysis set. *A more detailed analysis of exposure and safety by cohort will be presented. Causes of death were: pneumonitis and respiratory failure; cardiac arrest. TRAE=treatment-related adverse event.

      8eea62084ca7e541d918e823422bd82e Conclusion

      A large proportion of patients (37.5%) maintained retreatment for ≥24 weeks, suggesting that patients who originally completed 12 months of treatment can tolerate sustained retreatment. The tolerability profile of durvalumab upon retreatment was similar to that seen during initial treatment, although there were two treatment-related deaths during the retreatment phase. Retreatment with anti-PD-L1 may be feasible for selected patients with NSCLC who demonstrate original benefit and progress off therapy.

      6f8b794f3246b0c1e1780bb4d4d5dc53

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      P1.01-53 - Bone Metastases and Efficacy of Immunotherapy in Patients with Pretreated Advanced Non-Small-Cell Lung Cancer (NSCLC) (ID 11980)

      16:45 - 18:00  |  Author(s): Paolo Bidoli

      • Abstract

      Background

      Approximately 40% of NSCLC patients develop bone metastases (BoM). Bone has active functions in regulating immune system. To date, no trial evaluated the role of BoM in modulating response to immunotherapy. Aim of the present study was to investigate whether presence of BoM impact on immunotherapy efficacy.

      a9ded1e5ce5d75814730bb4caaf49419 Method

      Two different cohorts of pretreated NSCLC patients (cohort A: Non-squamous; cohort B: Squamous) were evaluated for nivolumab efficacy in terms of objective response rate (ORR), progression free survival (PFS), and overall survival (OS) according to presence or absence of BoM. All patients received nivolumab at standard dose of 3 mg/kg every 2 weeks within the Italian Expanded Access Program.

      4c3880bb027f159e801041b1021e88e8 Result

      Cohort A accounted for 1588 patients with non-squamous NSCLC: 626 (39%) with (BoM+) and 962 (61%) without BoM (BoM-). Cohort B accounted for 370 patients with squamous histology: 102 BoM+ (32%) and 251 BoM- (68%). In Cohort A, BoM+ had a significantly lower ORR (12% versus 34%; p < 0.0001), shorter PFS (2.0 versus 4.0 months, p < 0.0001) and shorter OS (7.4 versus 15.3 months, p <0.0001). In cohort B, BoM+ had significantly lower ORR (15% versus 22%; p < 0.04), shorter PFS (2.7 versus 5.4 months, p <0.0001) and shorter OS (5.0 versus 10.9 months, p <0.0001). Presence of BoM negatively affected outcome irrespective of PS (OS cohort A: PS-0 BoM+ 12.0 versus 20.9 months in PS-0 BoM-, p<0.0001; OS cohort B: PS-0 BoM+ 5.8 versus 16.4 months in PS-0 BoM-, p<0.0001). Multivariate analysis confirmed that presence of BoM independently associated with higher risk of death with HR 1.64 and HR 1.78, for Cohort A and B, respectively.

      8eea62084ca7e541d918e823422bd82e Conclusion

      Our results, the first assessing BoM in patients treated with immunotherapy, suggested that BoM predict lower efficacy of immunotherapy. BoM should be included as stratification factor in clinical trials.

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