Virtual Library

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    OA07 - Oligometastasis: What Should Be the State-Of-The-Art? (ID 905)

    • Event: WCLC 2018
    • Type: Oral Abstract Session
    • Track: Oligometastatic NSCLC
    • Presentations: 8
    • Moderators:
    • Coordinates: 9/24/2018, 15:15 - 16:45, Room 107
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      OA07.01 - Phase II Study of Pembrolizumab for Oligometastatic Non-Small Cell Lung Cancer (NSCLC) Following Completion of Locally Ablative Therapy (LAT) (ID 12590)

      15:15 - 15:25  |  Presenting Author(s): Joshua Michael Bauml  |  Author(s): Rosemarie Mick, Christine Ciunci, Charu Aggarwal, Christiana Davis, Tracey Evans, Charuhas Deshpande, Linda Miller, Pooja Patel, Evan Alley, Christina Knepley, Faith Mutale, Roger B Cohen, Corey J Langer

      • Abstract
      • Presentation
      • Slides

      Background

      Patients (pts) with oligometastatic NSCLC may benefit from LAT (e.g., surgery, stereotactic radiation (SRT)). It is unclear if systemic therapy can provide benefit after LAT. We completed a Phase II study evaluating the efficacy of pembrolizumab after LAT, hypothesizing that immunotherapy would be effective in the setting of a minimal disease burden.

      a9ded1e5ce5d75814730bb4caaf49419 Method

      Eligibility stipulated oligometastatic NSCLC (up to 4 sites) with completion of LAT to all known sites of disease. Within 4-12 weeks of completing LAT, pts began pembrolizumab 200 mg every 21 days for 6 mos, with a provision to continue for up to a year in the absence of progression (PD) or toxicity. Progression-free survival (PFS) and overall survival (OS) were measured from the start of LAT. A sample size of 42 pts would provide 80% power for a test at 5% 1-sided type I error to increase PFS to >=10 mos compared to a historical control PFS of 6.6 mo.

      4c3880bb027f159e801041b1021e88e8 Result

      Since January 2015, 45 pts have been enrolled. Median age is 64 years; 53% male; 89% Caucasian; 89% current and former smokers. Most common metastatic sites are lung (16 pts), brain (18), liver (9), and bone (9). LAT included surgery (30 pts), SRT (30), and chemoradiotherapy (23). Adverse events have been mostly mild. There were two episodes of Grade 3 pneumonitis, two episodes of Grade 3 colitis, and one episode of Grade 3 adrenal insufficiency. Median follow-up from start of LAT is 20.1 mos. To date, 19 pts have had PD or died. Median PFS was 25 mos. PFS rates (+ SE) at 12, 18 and 24 mos are 72%+7%, 54%+9% and 50%+9%, with 10 free of PD/death beyond 24 mos. To date, 10 pts have died. Median OS has not yet been reached. OS rates (+ SE) at 12, 18 and 24 mos are 91%+4%, 82%+7% and 73%+8%, with 14 pts alive beyond 24 mos. Median PFS was 16.9 mos for pts with metachronous disease (n=33), not yet reached for pts with synchronous disease (n=12). Median OS has not yet been reached in either group.

      8eea62084ca7e541d918e823422bd82e Conclusion

      Pembrolizumab after LAT for oligometastatic NSCLC is feasible and well tolerated. PFS appears quite favorable, preliminarily Final analysis will be performed September 2018. Updated survival estimates and biomarker data will be presented.

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      OA07.02 - ATOM: A Phase II Study to Assess Efficacy of Preemptive Local Ablative Therapy to Residual Oligometastases After EGFR TKI (ID 12977)

      15:25 - 15:35  |  Presenting Author(s): Oscar S.H. Chan  |  Author(s): Kwok Chi Lam, Jacky Yu Chung Li, Frankie Choi, Catherine Wong, Amy Chang, Frankie Mo, Ki Wang, Rebecca Yeung, Tony S. Mok

      • Abstract
      • Presentation
      • Slides

      Background

      NSCLC patients (Pts) harboring EGFR mutation invariably develop resistance to EGFR TKI at a median time of 9-13 months. Prior studies have showed that local ablative therapy (LAT) upon oligoprogression (OP) can extend the duration of TKI therapy effectively. We postulate that residual positron emission tomography (PET) avid lesions after initial treatment of EGFR TKI may harbor resistant clones and preemptive LAT may improve progression free survival (PFS).

      a9ded1e5ce5d75814730bb4caaf49419 Method

      This single-arm phase II study aims to determine the efficacy of preemptive LAT to residual metabolic active oligo-metastases after initial TKI. Pts with stage IIIB/ IV EGFR M+ NSCLC who possessed oligoresidual (OR) disease (≤ 4 PET-avid lesions with SUV ≥2.5) after a 3-mth TKI therapy were enrolled. Those with initial PR underwent screening PET-CT. PET avid ORs would be treated by LAT, either by stereotactic ablative radiotherapy (SABR) or surgery per clinicians’ discretion. TKI was continued after LAT until it was considered ineffective. PET-CT was done on the 3rd and 12th month post-LAT (or at progression), apart from regular imaging. Further LAT was allowed if OP was detected. Primary endpoint was PFS rate at 1 year from enrollment. Overall survival (OS), treatment safety and comparison with screen failure cohorts were secondary endpoints.

      4c3880bb027f159e801041b1021e88e8 Result

      18 Pts were enrolled from 2014-17. Recruitment was stopped before the planned number (n = 34) due to slow accrual. Two were not analyzed due to consent withdrawal and significant protocol violation. Median follow up was 28.7 mth. Among the 16 analyzed Pts, the 1 year PFS rate (i.e. 15 mth post TKI) was 62.5%. OS data was not yet mature. All LAT were done by SABR, and none experienced ≥grade 3 SABR related toxicities. Compared with screen failure cohort (n = 43, metabolic CR or PR with residual disease not fulfilling LAT criteria), the 1 year and 2 year PFS favored treatment arm, though statistically not significant (62.5% vs 47.1%, 30.0% vs 7.9%; p = 0.15).

      8eea62084ca7e541d918e823422bd82e Conclusion

      The 1-yr PFS rate is encouraging. A trend of improved long term PFS is noted in Pts receiving preemptive LAT to residual PET-avid OM after initial TKI compared with Pts without LAT. Further studies are warranted.

      Clinical Trial information: NCT01941654

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      OA07.03 - Addition of Local Therapy to EGFR TKI Showed Survival Benefit in EGFR-Mutant NSCLC pts with Oligometastatic or Oligoprogressive Liver Metastases (ID 12263)

      15:35 - 15:45  |  Presenting Author(s): Tao Jiang  |  Author(s): Caicun Zhou, Huijuan Wang, Qian Chu

      • Abstract
      • Presentation
      • Slides

      Background

      Our previous study demonstrated that EGFR-mutant NSCLC patients (Pts) with liver metastases (LM) showed poor response to EGFR-TKIs than those without LM, suggesting that additional treatment is warranted. Recently, several clinical studies indicated that local therapy (e.g. surgery and radiotherapy) could significantly improve progression-free survival (PFS) in NSCLC Pts with oligometastatic or oligoprogressive disease. This study aimed to investigate whether addition of local therapy to EGFR-TKIs could provide a better survival benefit than TKIs alone in EGFR-mutant NSCLC Pts with oligometastatic or oligoprogressive LM.

      a9ded1e5ce5d75814730bb4caaf49419 Method

      Pts with EGFR-mutant NSCLC and LM were enrolled. Oligometastatic LM was defined as < 5 sites in liver without extrahepatic metastases at initial diagnosis. Oligoprogressive LM was defined as < 5 sites in liver without extrahepatic metastases during TKIs therapy. For oligoprogressive cohort, PFS1 was calculated from time of initiation of TKI therapy to first RECIST 1.1 defined progress disease (PD) or death. PFS2 was calculated from time of initiation of TKI therapy to off-TKI PD.

      4c3880bb027f159e801041b1021e88e8 Result

      Totally, 135 cases with EGFR-mutant NSCLC and LM were eligible (64 with oligometastatic LM and 71 with oligoprogressive LM). In oligometastatic cohort, 20 Pts received EGFR-TKIs (E) and 23 Pts received EGFR-TKIs plus local therapy (E+LT) as first-line treatment. The addition of local therapy showed a significantly longer PFS (12.9 vs. 7.9 m, P = 0.041) and OS (36.8 vs. 21.3 m, P = 0.034) than EGFR-TKIs alone. In oligoprogressive cohort, 24 Pts received continuation of EGFR-TKIs plus local therapy (cE+LT) and 25 Pts received switch therapy (ST). Median PFS1 was similar. Median PFS2 (13.9 vs. 9.2 m, P = 0.007) and OS (28.3 vs. 17.1 m, P = 0.011) was significantly longer in cE+LT group than in ST group. Multivariate analysis revealed that addition of local therapy was independently associated with prolonged PFS (HR = 0.435, P = 0.028) and OS (HR = 0.434, P = 0.071) in Pts with oligometastatic LM. Distant metastatic sites were the major pattern of failure in EGFR-TKI plus local therapy group while locoregional recurrence including primary lesions and LM was the major reason in TKI alone group.

      8eea62084ca7e541d918e823422bd82e Conclusion

      The current study suggested that EGFR-TKIs plus local therapy demonstrated the prolonged survival benefit than EGFR-TKIs alone in EGFR-mutant NSCLC Pts with oligometastatic or oligoprogressive LM. These findings suggest that local therapy should be further explored in large-scale, strictly designed clinical trials as a standard treatment option in this clinical scenario.

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      OA07.04 - Discussant - OA 07.01, OA 07.02, OA 07.03 (ID 14558)

      15:45 - 16:00  |  Presenting Author(s): Gregory M.M. Videtic

      • Abstract
      • Presentation
      • Slides

      Abstract not provided

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      OA07.05 - Local Ablative Therapy Improves Survival in Patients with Synchronous Oligometastatic NSCLC Harboring EGFR Mutation Treated with EGFR-TKIs (ID 11141)

      16:00 - 16:10  |  Presenting Author(s): Yaping Xu  |  Author(s): Qinghua Xu, Fei Zhou, Hui Liu, Caicun Zhou

      • Abstract
      • Presentation
      • Slides

      Background

      Non-small-cell lung cancer (NSCLC) is the most common cause of cancer deaths worldwide. Patients with oligometastatic disease can represent an indolent phenotype that could benefit from local ablative therapy(LAT). Howerver, whether first-line continual EGFR-TKIplus LAT could have potential benefit in EGFR-mutant NSCLC patients with oligometastatic disease remains undetermined.

      a9ded1e5ce5d75814730bb4caaf49419 Method

      Patients with stage IV EGFR-mutant NSCLC and no more than five metastases at diagnosis in 2 months were enrolled. All patients were treated with first-line EGFR-TKIs. Consolidation LAT included radiotherapy or surgery. Overall survival (OS) and progression-free survival (PFS) were estimated by Kaplan-Meier curves.

      4c3880bb027f159e801041b1021e88e8 Result

      From October 2010 to May 2016, 145 patients were enrolled, including 51 (35.2%) who received consolidation LAT to all oligometastatic sites (All-LAT group), 55 (37.9%) who received consolidation LAT to either primary tumor or oligometastatic sites (Part-LAT group), and 39 (26.9%) who did not receive any consolidation LAT (Non-LAT group). The median PFS in All-LAT, Part-LAT, and None-LAT group were 20.6 months, 15.6 months, and 13.9 months, respectively (P<0.001). The median OS in All-LAT, Part-LAT, and None-LAT group were 40.9 months, 34.1 months, and 30.8 months, respectively (P<0.001). The difference was significant between All-LAT group and Part-LAT or Non-LAT group but was not significant between Part-LAT and Non-LAT group. The median OS was significantly improved with consolidation LAT for primary tumor (40.5 versus 31.5 months, P<0.001), brain metastases (38.2 versus 29.2 months, P=0.002), adrenal metastases (37.1 versus 29.2 months, P =0.032). Adverse events (Grade≥3) due to radiotherapy included pneumonitis (7.7%) and esophagitis (16.9%).

      8eea62084ca7e541d918e823422bd82e Conclusion

      The current study demonstrated that consolidation LAT to all sites was a feasible option among patients with EGFR-mutant oligometastatic NSCLC during first-line EGFR-TKI treatment, with significantly improved PFS and OS compared with consolidation LAT to partial sites or observation alone.

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      OA07.06 - Efficacy of Local Consolidative Therapy for Oligometastatic Lung Adenocarcinoma Patients Harboring EGFR Mutations. (ID 12523)

      16:10 - 16:20  |  Presenting Author(s): Fang Hu  |  Author(s): Jianlin Xu, Bo Zhang, Changhui Li, Wei Nie, Ping Gu, Ping Hu, Huimin Wang, Yujun Zhang, Yinchen Shen, Shuyuan Wang, Baohui Han, Xueyan Zhang

      • Abstract
      • Presentation
      • Slides

      Background

      For oligometastatic lung adenocarcinoma patients with sensitive EGFR mutations, the role of local consolidative therapy (LCT) remains debatable. The purpose of this study was to investigate the efficacy of LCT in these patients.

      a9ded1e5ce5d75814730bb4caaf49419 Method

      Advanced stage patients with oligometastatic lung adenocarcinoma who harboring EGFR mutation were identified at the Shanghai Chest Hospital from 2010 to 2016.

      4c3880bb027f159e801041b1021e88e8 Result

      A total of 253 patients (149 patients who received LCT plus EGFR-TKIs [combination group] and 104 patients who received EGFR-TKIs [TKI monotherapy group] were included. The median PFS time in the combination group was 14 months versus 9 months in the TKI monotherapy group (HR=0.57, 95% [CI] 0.44, 0.79, p<0.01, Figure 1 A). The median OS time in the combination group was 33 months versus 20 months in the TKI monotherapy group (HR=0.56, 95% [CI] 0.41, 0.75, p<0.01, Figure 1D). Survival benefit was independent of EGFR mutation type (PFS: 19del, p=0.02, Figure 1B; 21L858R, p<0.01, Figure 1C; OS: 19del, p=0.0189, Figure 1E; 21L858R, p<0.01, Figure 1F) and metastatic sites .figure 1.jpg

      8eea62084ca7e541d918e823422bd82e Conclusion

      LCT combined with TKI therapy was feasible and significantly improved PFS and OS among oligometastatic lung adenocarcinoma patients with sensitive EGFR mutations, and thus, should be considered as an important medical treatment during clinical management.

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      OA07.07 - PFS and OS Beyond 5 years of NSCLC Patients with Synchronous Oligometastases Treated in a Prospective Phase II Trial (NCT 01282450) (ID 13389)

      16:20 - 16:30  |  Presenting Author(s): Dirk De Ruysscher  |  Author(s): Rinus Wanders, Lizza Hendriks, Angela Van Baardwijk, Bart Reymen, Ruud Houben, Gerben Bootsma, Cordula Pitz, Anne-Marie C. Dingemans

      • Abstract
      • Presentation
      • Slides

      Background

      There is increasing interest in the treatment of synchronous oligometastases of NSCLC. Two randomized studies demonstrated an increased PFS by adding a radical local treatment to systemic therapy in responding patients, but long-term data are lacking. We previously reported a median PFS of 12 months and a median OS of 13.5 months in 39 radically treated patients with synchronous oligometastases in a prospective study (De Ruysscher J Thorac Oncol 2012). As the minimal follow-up is now exceeding 6 years, we here report the long-term PFS and OS.

      a9ded1e5ce5d75814730bb4caaf49419 Method

      Prospective single-arm phase II trial. The main inclusion criteria were pathologically proven NSCLC stage IV with less than five metastases at primary diagnosis, amendable for radical local treatment (surgery or radiotherapy). No previous response to systemic treatment was required.

      4c3880bb027f159e801041b1021e88e8 Result

      Forty patients were enrolled, 39 of whom were evaluable (18 men, 21 women); mean age was 62.1 ± 9.2 years (range, 44-81). Twenty-nine (74%) had local stage III; 17 (44%) brain, seven (18%) bone, and four (10%) adrenal gland metastases. Thirty-five (87%) had a single metastatic lesion. Thirty-seven (95%) of the patients received chemotherapy as part of their primary treatment.

      Median overall survival (OS) was 13.5 months (95% CI 7.6-19.4); 1-, 2-, 3-, 4-, 5, 6-year OS was 56.4%, 23.3%, 12.8 %, 10.3 %, 7.7 %, 5.1 % (2 patients), respectively.

      Median progression-free survival (PFS) was 12.1 months (95% CI 9.6-14.3); 1-, 2-, 3-, 4-, 5, 6-year PFS was 51.3%, 13.6 %,12.8 %, 7.7 %, 7.7 %, 2,5 % (1 patient), respectively.

      Of the 3 patients with a PFS after 5 years, 1 had a squamous cell cancer T2N2 with a single pathologically proven bone metastasis in the sternum, 1 had a NSCLC-NOS T4N0 with a single adrenal metastasis, and 1 a T1N2 adenocarcinoma with a pathologically proven contralateral lung metastasis. The latter patient is still free of disease.

      Two patients developed a second primary cancer: 1 tongue carcinoma after 70 months and 1 an adenocarcinoma in the contralateral lung after 71 months. Both patients died of their second cancer.

      Three patients (7.7 %) had a local recurrence, all in the PTV of their primary tumor.

      Only one patient was treated with a TKI (gefitinib) at progression.

      8eea62084ca7e541d918e823422bd82e Conclusion

      After radical treatment of oligometastases, approximately 8 % of the patients achieve a PFS after 5 years. Entering patients in trials combining local therapy with novel systemic agents (e.g. chemo-immunotherapy) remains mandatory.

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      OA07.08 - Discussant - OA 07.05, OA 07.06, OA 07.07 (ID 14559)

      16:30 - 16:45  |  Presenting Author(s): Sue S Yom

      • Abstract
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      Abstract not provided

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    PC09 - Approaches to Management of Advanced NSCLC (ID 848)

    • Event: WCLC 2018
    • Type: Pro-Con Session
    • Track: Advanced NSCLC
    • Presentations: 4
    • Moderators:
    • Coordinates: 9/26/2018, 10:30 - 12:00, Room 107
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      PC09.01 - Debate 1: Early vs Delayed Treatment of Asymptomatic Brain Metastases in Wild-Type NSCLC - Early (ID 11639)

      10:30 - 10:45  |  Presenting Author(s): Qing Zhou

      • Abstract
      • Presentation
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      Abstract not provided

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      PC09.02 - Debate 1: Early vs Delayed Treatment of Asymptomatic Brain Metastases in Wild-Type NSCLC - Delayed (ID 11640)

      10:45 - 11:00  |  Presenting Author(s): Walter John Curran, Jr.

      • Abstract
      • Presentation
      • Slides

      Abstract not provided

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      PC09.04 - Debate 2: Large Cell Neuroendocrine Carcinoma Should Be Treated like NSCLC or SCLC? - NSCLC (ID 11641)

      11:15 - 11:30  |  Presenting Author(s): Noemi Reguart

      • Abstract
      • Presentation
      • Slides

      Abstract not provided

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      PC09.05 - Debate 2: Large Cell Neuroendocrine Carcinoma Should Be Treated like NSCLC or SCLC? - SCLC (ID 11642)

      11:30 - 11:45  |  Presenting Author(s): Scott A. Laurie

      • Abstract
      • Presentation
      • Slides

      Abstract not provided

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    SH03 - Highlight of the Previous Day Sessions (ID 885)

    • Event: WCLC 2018
    • Type: Highlight of the Day Session
    • Track:
    • Presentations: 4
    • Moderators:
    • Coordinates: 9/26/2018, 07:00 - 08:00, Room 107
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      SH03.01 - Thymoma & Outcomes (ID 13422)

      07:00 - 07:12  |  Presenting Author(s): Shirish Gadgeel

      • Abstract
      • Presentation
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      Abstract not provided

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      SH03.02 - Targeted (ID 14785)

      07:12 - 07:24  |  Presenting Author(s): Alice T. Shaw

      • Abstract
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      Abstract not provided

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      SH03.03 - Biology (ID 14786)

      07:24 - 07:36  |  Presenting Author(s): Glen Reid

      • Abstract
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      Abstract not provided

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      SH03.04 - Screening (ID 14787)

      07:36 - 07:48  |  Presenting Author(s): Stephen Lam

      • Abstract
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      Abstract not provided

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