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Anne-Marie Boothman

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    EX04 - Mini Oral Abstract Session - MA08.06, MA18.02, MA19.02, MA20.11 (ID 1006)

    • Event: WCLC 2018
    • Type: Exhibit Showcase
    • Track: Advanced NSCLC
    • Presentations: 1
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      EX04.03 - Prior Therapy and Increased Expression of PD-L1 in NSCLC Tumor Samples (ID 11881)

      10:05 - 10:10  |  Presenting Author(s): Anne-Marie Boothman

      • Abstract
      • Slides


      Tumor PD-L1 expression has been shown to enrich for response to immunotherapy in several indications, including advanced NSCLC. However, the stability of PD-L1 expression over time and its relationship with non-immunotherapy cancer treatment is currently uncertain. We hypothesized that prior chemotherapy or radiotherapy would increase PD-L1 expression.

      a9ded1e5ce5d75814730bb4caaf49419 Method

      In the Phase 2, open-label, single-arm durvalumab ATLANTIC study (NCT02087423), patients who had received ≥2 prior systemic regimens in the treatment of Stage IIIB or IV NSCLC were screened for tumor PD-L1 expression by immunohistochemistry using the VENTANA PD-L1 (SP263) Assay (25% tumor cell [TC] cutoff). PD-L1 expression was assessed using either a recent (<3 months) or archival sample; a subset of patients provided both. The relationship between non-immunotherapy cancer treatment and prevalence of tumor PD-L1 expression ≥25% (TC≥25%) was assessed in patients who received therapy prior to sample acquisition versus those who did not. Pearson’s chi-squared test was used to examine the differences between patient subgroups.

      4c3880bb027f159e801041b1021e88e8 Result

      Of the patients screened for participation in ATLANTIC, 1590 were successfully assessed for PD-L1 expression. PD-L1 TC≥25% prevalence was higher in patients who had received prior radiotherapy or chemotherapy before sample acquisition, with prevalence noticeably higher in those who had received ≥2 lines of prior chemotherapy. Prior EGFR inhibitor treatment did not have any noticeable relationship to TC≥25% prevalence (Table). In the subset of patients with paired recent and archival samples, TC≥25% prevalence remained the same in 74% of cases, increased over time in 19.5%, and decreased in 6.5%.

      Treatment regimen

      Subgroup (n)

      PD-L1 TC≥25% prevalence (%)


      Prior tyrosine kinase inhibitor (TKI)

      No prior TKI (607)



      Prior TKI (411)


      Prior EGFR inhibitor (379)



      Prior ALK inhibitor (15)


      Prior chemotherapy

      No prior chemotherapy (145)



      Prior chemotherapy (873)


      Number of lines of prior chemotherapy

      0 (155)



      1 (10)


      2 (138)


      >2 (725)


      Prior radiotherapy

      No prior radiotherapy (599)



      Prior radiotherapy (419)


      8eea62084ca7e541d918e823422bd82e Conclusion

      PD-L1 expression may increase in response to chemotherapy or radiotherapy and is unlikely to decrease over time. Re-biopsy may provide a more accurate assessment of current tumor PD-L1 expression status when a low/negative result is seen in an archival sample, particularly if the patient has received multiple lines of intervening radiotherapy or chemotherapy.


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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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      P1.16-06 - Expanded Efficacy and Safety Analysis of PACIFIC Based on a PD-L1 Cutpoint of 25% (ID 12992)

      16:45 - 18:00  |  Author(s): Anne-Marie Boothman

      • Abstract
      • Slides


      In the Phase 3 PACIFIC study of patients with stage III, unresectable NSCLC without progression after concurrent chemoradiotherapy (cCRT), PFS was significantly longer with durvalumab versus placebo (stratified HR 0.52; 95% CI 0.42–0.65; P<0.0001). We report exploratory analyses of PACIFIC outcomes by PD-L1 expression assessed in tumor samples collected prior to cCRT.

      a9ded1e5ce5d75814730bb4caaf49419 Method

      PACIFIC (NCT02125461) was a Phase 3, randomized, double-blind study of patients with WHO PS 0/1 without progression after ≥2 cycles of platinum-based cCRT. Eligibility was irrespective of PD-L1 expression; archived samples were optional for testing (VENTANA PD-L1 [SP263] assay). No samples were obtained after cCRT, prior to infusion with durvalumab or placebo. Patients were randomized (2:1) to durvalumab 10 mg/kg IV Q2W or placebo up to 12 months, stratified by age, sex and smoking history. Co-primary endpoints were PFS (blinded independent central review, RECIST v1.1) and OS (not available). Secondary endpoints included ORR and safety. We investigated associations between subgroups of patients with PD-L1 expression on tumor cells (TC) of <25% or ≥25% and efficacy.

      4c3880bb027f159e801041b1021e88e8 Result

      As of February 13, 2017, 713 patients were randomized; 451 (63.3%) had known PD-L1 status (TC<25%, 64.7%; TC≥25%, 35.3%; Table). Baseline characteristics and prior therapy (including best response to prior therapy) were generally well balanced between arms across both PD-L1 subgroups. PFS benefit with durvalumab was demonstrated irrespective of PD-L1 status (HR 0.59; 95% CI, 0.43–0.82 for TC<25% and HR 0.41; 95% CI, 0.26–0.65 for TC≥25%) (Table). ORR was greater with durvalumab compared to placebo regardless of PD-L1 status (Table). The overall safety profile of durvalumab in each PD-L1 subgroup was consistent with the ITT population treated with durvalumab.

      8eea62084ca7e541d918e823422bd82e Conclusion

      Durvalumab demonstrated clinical benefit and had a well-tolerated, manageable safety profile irrespective of PD-L1 status obtained from archival tumor samples prior to cCRT.

      PD-L1 TC<25%

      PD-L1 TC≥25%

      Durvalumab (n=187)


      Durvalumab (n=115)


      Completed 12 months treatment, n (%)

      74 (39.6)

      35 (33.3)

      55 (47.8)

      13 (29.5)


      Median (95% CI), months

      16.9 (11.0–NR)

      6.9 (5.0–11.0)

      17.8 (11.1–NR)

      3.7 (2.0–13.2)

      HR (95% CI)

      0.59 (0.43–0.82)

      0.41 (0.26–0.65)






      n (%)

      [95% CI]

      50 (29.4)


      19 (19.8)


      31 (28.7)


      6 (15.0)


      *In the overall ITT population, median PFS was 16.8 months (95% CI, 13.0–18.1) with durvalumab (n=476) vs. 5.6 months (95% CI, 4.6–7.8) with placebo (n=237), with an HR of 0.52 (95% CI, 0.42–0.65; P<0.001) (stratified log-rank); PD-L1 assessment was not required in the study; in PD-L1 unknown patients, median PFS was 14.0 months (95% CI, 9.2–NR) with durvalumab (n=174) vs. 6.4 months (95% CI, 3.8–9.0) with placebo (n=88), with an HR of 0.59 (95% CI, 0.42–0.83) (unstratified Cox proportional hazards model); ORR for n evaluable patients included unconfirmed responses. ITT, intention-to-treat; NR, not reached; ORR, objective response rate; PFS, progression-free survival.


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