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Eric Lim



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    ES04 - Multimodality Management of Small Cell and Neuroendocrine Cancers (ID 7)

    • Event: WCLC 2019
    • Type: Educational Session
    • Track: Small Cell Lung Cancer/NET
    • Presentations: 1
    • Now Available
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      ES04.03 - Surgery for Early and Locally Advanced Small Cell Lung Cancer (Now Available) (ID 3170)

      10:30 - 12:00  |  Presenting Author(s): Eric Lim

      • Abstract
      • Presentation
      • Slides

      Abstract not provided

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    MA12 - New Frontiers from Pathology to Genomics (ID 138)

    • Event: WCLC 2019
    • Type: Mini Oral Session
    • Track: Mesothelioma
    • Presentations: 1
    • Now Available
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      MA12.02 - Growth Patterns in Epithelioid Malignant Pleural Mesothelioma: A Clinicopathological Review of 614 Cases Over 15 Years (Now Available) (ID 1595)

      14:00 - 15:30  |  Author(s): Eric Lim

      • Abstract
      • Presentation
      • Slides

      Background

      Nuclear grading system has been validated as a powerful prognostic tool for epithelioid malignant pleural mesothelioma (MPM) whilst growth patterns had demonstrated prognostic value in earlier studies. We aim to externally validate the previous findings and evaluate the utility of a composite architecture-nuclear grade scoring system.

      Method

      We retrospectively reviewed 614 consecutive cases of epithelioid MPM diagnosed at our institution over a 15-year period. Clinicopathological information including predominant growth pattern (Solid, Tubulo-papillary, Trabecular, Micropapillary, Microcystic, Discohesive, Pleomorphic) and 2-tier nuclear grade were retrieved from an institutional mesothelioma database. The tumours were categorised into High Grade (Solid, Micropapillary, Score=1) and Low Grade (All others, Score=0). A composite score (0-2) was generated based on growth pattern and 2-tier nuclear grade (0-1). Survival analysis was performed using Kaplan-Meier method.

      Result

      Pleomorphic epithelioid MPM was associated with the worst median overall survival (5.4 months), followed by micropapillary- (6.2 months), solid- (10.5 months), microcystic- (15.3 months), discohesive- (16.1 months), trabecular- (17.6 months) and tubulo-papillary- (18.6 months) patterns. The composite scoring system further improved stratification of overall survival based on 2-tier nuclear grade (19.8 vs. 13.4 vs. 8.1 months, p<0.001).

      growth patterns (except cribriform_wdpm).jpg

      composite architecture-ng score v2.jpg

      Conclusion

      Epithelioid MPM growth patterns predicted survival in our cohort. Composite architecture-nuclear grade scoring system further improved prognostic stratification.

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    MA20 - Thymic Tumors: From Molecular to Clinical Results and New Challenges in Other Rare Thoracic Tumors (ID 149)

    • Event: WCLC 2019
    • Type: Mini Oral Session
    • Track: Thymoma/Other Thoracic Malignancies
    • Presentations: 1
    • Now Available
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      MA20.06 - Neutrophil to Lymphocyte Ratio Is an Independent Prognostic Predictor in Thymoma (Now Available) (ID 1637)

      11:30 - 13:00  |  Author(s): Eric Lim

      • Abstract
      • Presentation
      • Slides

      Background

      Thymoma is the most common primary neoplasm of the anterior mediastinum in adults and conventional prognostic factors include Masaoka Stage, WHO histology and completeness of resection. Little is known of preoperative peripheral neutrophil-to-lymphocyte ratio (NLR) as an independent additional discriminator of prognosis.

      Method

      We performed an international multicentre retrospective cohort study (UK Health Research Reference 19/HRA/0440 and EU internal approval reference xxxxxx). We included patients who underwent complete resection for thymoma and data was acquired through patient medical records with follow up data obtained through national database and hospital records. NLR calculated on pre-operation bloods results.

      Result

      From July 1987 to December 2017, 433 patients underwent surgery for thymoma. The majority were male 228(53%) with a mean age (SD) of 55(15) years. The surgical approach was sternotomy in 335 patients (77%), thoracotomy in 23(5%) and VATS in 75(17%). The WHO classification was type A 63(15%), AB 126(29%), B1 98(23%), B2 55(13%) and B3 86(20%) patients. The Masaoka-Koga stage was I in 135(33%) II in 194(47%), III in 54 (13%) and IV in 31(7%) patients.

      Median (IQR) follow-up time was 86 (30 to 152) months with a 5 and 10-year survival of 88% and 79% respectively. The median NLR was 2.1 (1.5 to 3.1), when split into three groups (NLR < 1.4, NLR between 1.4 and 2.3 and NLR > 2.3), higher NLR was associated with poorer survival (log rank P<0.001) that persisted on Cox regression after adjustment for WHO grade and Masaoka stage with a HR of 1.69 (95% CI 1.20 to 2.39; P=0.002).

      nlr thymoma.png

      Conclusion

      Pre-operative NLR is a simple, low cost biomarker that can stratify risk of death independent to WHO grade and Masaoka stage in patients undergoing surgery for thymoma.

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    MA23 - Preclinical Models and Genetics of Malignant Pleural Mesothelioma (ID 353)

    • Event: WCLC 2019
    • Type: Mini Oral Session
    • Track: Mesothelioma
    • Presentations: 2
    • Now Available
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      MA23.10 - Low Number of Mutations and Frequent Co-Deletions of CDKN2A and IFN Type I Characterize Malignant Pleural Mesothelioma (Now Available) (ID 1627)

      14:30 - 16:00  |  Author(s): Eric Lim

      • Abstract
      • Presentation
      • Slides

      Background

      Malignant pleural mesothelioma (MPM) is an aggressive tumour with dismal prognosis and overall survival.

      To expand our understanding of molecular background of MPM and to identify novel targetable aberrations we report an integrated genomic analysis of 121 tumour samples.

      Method

      Fresh-frozen tumour samples (obtained from Mesobank UK,the BLF funded Mick Knighton Mesothelioma Tissue Bank, Respiratory BRU Biobank Diagnostic Archive, Royal Brompton Hospital and an Imperial College London prospective study) were analysed by whole exome sequencing (WES, n=50), SNP genotyping (n=118) and targeted capture sequencing (n=119) for 57 genes.

      Sequencing libraries were prepared using Target Enrichment Systems for the Illumina Multiplexed Sequencing platform. Somatic mutations were called using VarScan after recalibration of alignments by Genome Analysis Toolkit (GATK). SNP genotyping was performed with the Human Infinium Omni-Express-Exome v1.3/1.4 Bead Chips arrays. Segmentation and copy number calling was performed using a combination of Allelic specific copy number analysis of tumour (ASCAT), DNACopy and GISTIC softwares.

      Result

      Analysis of WES paired samples revealed a median of 31 non-synonymous somatic mutations per tumour, lower than melanoma (315 somatic mutations) or lung cancer (187.5 for squamous and 158 for adenocarcinoma), two types of tumours linked to known carcinogen exposure.

      Investigation of copy number showed significant frequent deletion (q-value>0.05) of 9p21 locus where CDKN2A, MTAP and IFN type I genes are located. Deletion of CDKN2A was seen in 71/121 patients with homozygous deletion in 58/71 patients. Homozygous co-deletion of CDKN2A and IFN type I was seen in 38/58 patients, homozygous codeletion with MTAP in 49/58 patients while 37 patients showed all three as homozygous co-deleted.

      Patients with CDKN2A and IFN type I deletions had worse overall survival compared with the CDKN2A wild type and patients CDKN2A only deleted patients (median 8.3 months vs 13.1 months, p-value=0.016).

      Deletion of 3p21.1 locus and mutations in BAP1 were detected in 54.5% of the patients, making BAP1 the second most commonly altered gene. RB1 (13q14.2) was commonly altered mainly by deletion in 25.6% of the patients. NF2 and TP53 were affected by mutations in 19.8% and 7.4% of the patients, repectively. Patients with mutations in TP53 had worse overall survival compared with TP53 wild type patients (p-value=0.0005).

      Conclusion

      Co-deletion of CDKN2A, MTAP and IFN type I genes could have therapeutic implications for the patients. Deletion of IFN type I may have direct implications for patient responses to immunotherapy. In the contex of multiple vulnerabilities, the presence of both CDKN2A and RB1 loss might define an important group of patients susceptible to CDK4/6i targeted therapies.

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      MA23.11 - Analysis of Immune Phenotype Composition in Malignant Pleural Mesothelioma (MPM) Using Bulk RNA Sequencing (Now Available) (ID 2326)

      14:30 - 16:00  |  Author(s): Eric Lim

      • Abstract
      • Presentation
      • Slides

      Background

      Exploiting the immune status of the tumour microenvironment (TME) is increasingly being adopted for many cancer types. Investigation into immune phenotype composition of the TME is at present lacking for malignant pleural mesothelioma (MPM) but critically important in light of the cancer’s overall poor prognosis and lack of targeted therapy as clinical standard of care. In this study, CD8+ve tumour infiltrating lymphocyte (TIL) level has been used as a starting point to compare differences in mutational patterns, histology and survival in MPM.

      Method

      Bulk RNA sequencing of tumour tissue from 35 MPM patients (in-house cohort) was performed. Sequencing read alignment and gene count estimation were performed using STAR (v.2.5.2b). To increase the sample size, raw data from Bueno et al. (n=211 subjects) was accessed and gene count estimations performed. In addition, the TCGA-MESO cohort (n=86 subjects) count data was included from the GDC (Genomic Data Commons) website. All count data were normalized cohort-wise using the ‘voom’ method implemented in limma package. Deconvolution of constituent immune phenotypes in the TME from the bulk RNA-sequencing data was performed by applying CIBERSORT (v.1.04) on normalized count data sets. For assessing the genetic context of observed immune phenotypes, somatic mutations were profiled using targeted sequencing of a custom gene panel for the in-house cohort. For the Bueno et al. and the TCGA-MESO cohorts, somatic mutations were either available from an overlap of whole-exome sequencing (WES) and targeted gene panel, or from WES only.

      Result

      A total of 27 samples (3 of 35 (8.6%), 21 of 211 (9.9%) and 3 of 86 (3.5%) from the in-house, Bueno et al. and TCGA-MESO cohorts respectively) were identified with immune phenotype enriched for CD8+ve TIL. Histological subtype distribution in the CD8+ve enriched samples was seen to be almost equivalently split between Epithelioid and Biphasic subtypes (51.85% and 48.15% respectively). Interestingly, BAP1 mutation was found to be present in only 7.7% of the samples. Considering in addition the genes NF2, SETD2, SETD6, SETDB1, TP53 and LATS1/2, mutations were only found to be present in 57.7% of the samples in total. As such >40% of samples with CD8+ve TIL do not have any mutations detected in known hotspot genes for MPM. Histological subtype is not significantly different between these ‘wild-type’ and hotspot gene(s) mutated samples. Median survival for the groups was found to be 1.85 and 0.73 years respectively.

      Conclusion

      In the present study, approximately 3-10% of MPM samples were found to have enrichment for CD8+ve TIL. Nonetheless on closer examination of the genetic context, mutation patterns emerge that warrant further investigation. For samples that have TP53 (n=3) mutation or mutations in multiple hotspot genes (BAP1, NF2, SETD2, LATS2; n=1), survival understandably is lowest (0.27 years average). This raises a number of further questions including what sustains a tumour despite high CD8+ve TIL population? And more importantly with lack of tumour mutational burden what other TME signals draw effector immune cells? Further investigations, by comparing additional immune markers with copy number changes that might be present in hotspot genes, are therefore required.

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    P1.06 - Mesothelioma (ID 169)

    • Event: WCLC 2019
    • Type: Poster Viewing in the Exhibit Hall
    • Track: Mesothelioma
    • Presentations: 1
    • Moderators:
    • Coordinates: 9/08/2019, 09:45 - 18:00, Exhibit Hall
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      P1.06-08 - WDPM-Like but Not Cribriform as Secondary Growth Patterns Modify Survival in Epithelioid Malignant Pleural Mesothelioma (ID 1609)

      09:45 - 18:00  |  Author(s): Eric Lim

      • Abstract
      • Slides

      Background

      The presence of well differentiated papillary mesothelioma (WDPM)- like and cribriform growth patterns in otherwise unequivocally invasive, tubulo-papillary-predominant epithelioid malignant pleural mesothelioma (MPM) is recognised in clinical practice, but their prognostic impact is largely uncertain. We hypothesise they modify prognosis as secondary patterns.

      Method

      We retrospectively reviewed the tubulo-papillary-predominant, invasive epithelioid MPM (n=269) as a subset of 614 consecutive epithelioid MPM diagnosed at our institution over a 15-year period. The diagnostic criteria for WDPM-like and cribriform patterns were inferred from those of canonical WDPM and lung adenocarcinoma. Survival analysis was performed using Kaplan-Meier method.

      Result

      We identified 10 cases of tubulo-papillary-predominant epithelioid exhibiting WDPM-like pattern, and one case being predominantly WDPM-like (Estimated incidence 4.1%). They are associated with significantly prolonged median overall survival (78.7 months vs. 18.0 months, p=0.001). On the other hand cribriform neither as predominant (n=9, 3.3%, p=0.672) or secondary growth patterns (n=46, 17.1%, p=0.952) achieved statistical significance in univariate setting compared with tubulo-papillary epithelioid MPM without such pattern.

      wdpm-like.jpg

      cribriform pattern (predominant and secondary).jpg

      Conclusion

      We propose tubulo-papillary-predominant epithelioid MPM with WDPM-like features as a rare and favourable prognostic group. Further molecular analysis is planned. Cribriform pattern does not appear to be prognostically relevant. We recommend external validation of our findings for both growth patterns.

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    P1.13 - Staging (ID 181)

    • Event: WCLC 2019
    • Type: Poster Viewing in the Exhibit Hall
    • Track: Staging
    • Presentations: 1
    • Moderators:
    • Coordinates: 9/08/2019, 09:45 - 18:00, Exhibit Hall
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      P1.13-11 - An Audit on IASLC Compliance of Lymph Nodes Dissection and Impact on Survival After Surgery for Non-Small Cell Lung Cancer (ID 196)

      09:45 - 18:00  |  Presenting Author(s): Eric Lim

      • Abstract
      • Slides

      Background

      The IASLC proposed minimal criteria for 6 nodes / stations to ascertain certainty status of complete (R0) resection after lung cancer surgery and in 2017, Edwards et al presented that failure of compliance leading to R0 (un) status was associated with poorer survival.

      The aims of this audit are to assess compliance of the IASLC recommendations on lymph node staging and determine the impact of R0 (un) status on prognosis in an independent cohort.

      Method

      We included patients who underwent lobectomy or pneumonectomy for primary lung cancer. Data was obtained from electronic records and survival status obtained from NHS Spine.

      Result

      From January 2010 to December 2017, 2,521 patients underwent lung resection for primary lung cancer staged using TNM7. The mean age (SD) was 67 (10) and 1,235 (49%) were men, the primary diagnoses were either adenocarcinoma or squamous carcinoma in 2,057 (82%).

      The IASLC compliance with 6 node / stations was 627 (25%) and when sub-carinal station was mandatory it was 608 (24%). After exclusions, we were left with 1,859 patients and on adjustment of T and N category, there was no difference between IASLC non-compliance R0 (un) on overall survival with a hazard ratio of 0.95 (95% CI 0.74 to 1.21; P=0.657) compared to R0 compliant.

      After adjusting for T and N category there was no significant difference in total lymph nodes stations harvested with a HR 1.01 (0.97 to 1.04, P=0.712) or number of positive stations HR 1.04 (0.92 to 1.16; P=0.543) in survival.

      lymph node.png

      Conclusion

      Independent validation of R0 (un) status did not concur with poorer survival. The designation carries uncertainty and likely to be influenced by the extent of N2 dissection. When adjusted for stage, there was no difference on number of stations harvested nor the total number of positive stations on survival.

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    P2.03 - Biology (ID 162)

    • Event: WCLC 2019
    • Type: Poster Viewing in the Exhibit Hall
    • Track: Biology
    • Presentations: 1
    • Moderators:
    • Coordinates: 9/09/2019, 10:15 - 18:15, Exhibit Hall
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      P2.03-10 - Comprehensive Molecular Profiling and Comparison of Common and Rarer Subtypes of Lung Cancer (ID 1870)

      10:15 - 18:15  |  Author(s): Eric Lim

      • Abstract
      • Slides

      Background

      Genomic profiling of tumours has become a crucial component of precision cancer medicine. In order to comprehensively characterize molecular alterations in different lung cancer subtypes, we analysed a total number of 327 samples by using Whole-Exome Sequencing (WES) and SNP genotyping arrays. Additionally, we used Targeted Capture Sequencing (TCS) for scanning a selected panel of genes (n=52) at high sequencing depth.

      Method

      We WES (McGill University Innovation Centre in Montreal) 153 paired tumour-normal samples, with a further 174 paired tumour-normal samples undergoing TCS. Sequencing data were processed and mutations identified using BWA (v.0.7.15), Picard (v.2.17.11), GATK (v.3.7), VarScan (v.2.4.2) and VEP (v. 92) softwares. Illumina OmniExpressExome (v1.6) arrays were used for genotyping all samples and copy number alterations (CNAs) were identified using ASCAT (v.2.5.2), DNACopy (v.1.56.0) and GISTIC (v.2.0) softwares.

      Result

      The analysed samples had a tumour content varying from 20 to 90%. The age range of patients was between 28 to 89 years. Out of 159 lung cancer patients, 89 patients had lung adenocarcinoma (LUAD), 36 squamous cell carcinoma (LUSC) and 34 lung neuroendocrine (NET), of which 22 were subclassified as lung carcinoid (LC), 6 small cell carcinoma (LSCLC), 5 large cell carcinoma (LCNEC) and 1 combined NET subtype.

      TP53 appeared as the most mutated gene in LUSCs (82%), non-carcinoid NETs (58%) and LUADs (47%), but not in the LC subtype, while the chromatin remodelling gene ARID1A was altered across all subtypes (9%). Other mutated genes in LUAD were KRAS (31%), STK11 (22%), RBM10 (15%), EGFR (14%) and KEAP1 (14%); in LUSC were PTEN (26%), CDKN2A (21%), KEAP1 (21%) and NF1 (15%); in NET, non-carcinoid top mutated genes included RB1 (42%), ENPP2 (33%), ERBB4 and STK11 (17% for each), while ARID1A and ACKR3 were each present in 9.5 % of LC.

      In LUADs, mutations in EGFR and KRAS appeared as mutually-exclusive (P=0.007), while gene pairs NFE2L2 - AKT1 (P=0.012) and STK11- ALK (P=0.029) were co-mutated in LUAD and LUSC, respectively. Deletions in exons 19 and 20 of EGFR correlated with longer survival time compared to patients with wild-type EGFR (P=0.058). In NET, patients with mutated RB1 showed lower survival time compared to patients with wild-type RB1 (P=0.022).

      Examination of CNAs showed TERT amplifications (5p15.33 cytoband) were commonly found at high frequencies across all subtypes, especially in non-carcinoid NET (71.4%). Other recurrent CNAs included amplifications in MYC in 37% of LUAD and 40% of LUSC, and in EGFR in 33% of LUAD and 14% of LUSC. Deletions in the CDKN2A locus were seen at frequencies of 31% and 28% in LUAD and LUSC, respectively.

      LC patients showed longer survival time compared to other tumours (P=0.015). COSMIC mutational signatures 18 (of unknown aetiology) and 24 (associated with exposure to aflatoxin) were exclusively found in LC.

      Conclusion

      The results confirm that lung cancer is a group of heterogenous diseases. In addition to the known effects of EFGR mutations, possible therapeutic avenues could be suggested for TERT amplifications, for which nucleoside analogues have shown to promote cancer cell death or EZH2 inhibitors for ARID1A-mutated cancers.

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    PL02 - Presidential Symposium including Top 7 Rated Abstracts (ID 89)

    • Event: WCLC 2019
    • Type: Plenary Session
    • Track:
    • Presentations: 1
    • Now Available
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      PL02.06 - In Hospital Clinical Efficacy, Safety and Oncologic Outcomes from VIOLET: A UK Multi-Centre RCT of VATS Versus Open Lobectomy for Lung Cancer (Now Available) (ID 1257)

      08:00 - 10:15  |  Presenting Author(s): Eric Lim

      • Abstract
      • Presentation
      • Slides

      Background

      VATS is currently the most popular form of access for lung cancer resection in the UK. However, there is limited comparative information from high quality randomised controlled trials and no information on early oncologic outcomes for quality assurance for a minimal access approach. VIOLET is the largest randomised trial conducted to date to compare clinical efficacy, safety and oncologic outcomes of VATS versus open surgery for lung cancer.

      Method

      VIOLET is a parallel group randomised trial conducted across 9 UK thoracic surgery centres. Participants with known or suspected primary lung cancer were randomised in a 1:1 ratio to VATS (one to four ports) or open lobectomy. Randomisation was stratified by surgeon. Patients within clinical stage cT1-3, N0-1 and M0 using TNM 8 with disease suitable for VATS or open surgery were eligible to join the trial. We report on early outcomes in the period from randomisation to hospital discharge after surgery.

      Result

      From Jul 2015 to Feb 2019, 2,109 patients were screened to randomise 503 participants to VATS (n=247) or open (n=256) lobectomy. The mean age (SD) was 69 (8.8) years and 249 (49.5%) were male. Baseline clinical T category was cT1 333 (67.3%), cT2 125 (25.2%), cT3 37 (7.5%) with cN0 466 (94%) and cN1 30 (6%). Lobectomy was undertaken in 221 (89.5%) patients randomised to VATS and 232 (90.6%) patients randomised to open surgery. The in-hospital mortality rate was 1.4% (7/502) and the conversion rate from VATS to open was 5.7% (14/246) with the main reasons listed as pleural adhesions (n=4) and bleeding (n=4).

      There were no differences in R0 resection; which was 98.8% (218/223) in the VATS group and 97.4% (228/234) in the open group; P=0.839 or in nodal upstaging from cN0/1 to pN2 disease which was observed in 6.2% (15/244) of the VATS group and 4.8% (12/252) of the open group; P=0.503.

      The median (visual analogue) pain score was 4 (interquartile range, IQR 2 to 5) in both groups on day one with 3 (1 to 5) in the VATS group and 4 (2 to 5) in the open group on day two.

      A significant reduction of overall in-hospital complications was observed in patients receiving VATS at 32.8% (81/247) compared to open 44.3% (113/255) surgery; P=0.008 without any difference in serious adverse events between the two groups, which was 8.1% (20/247) for VATS and 7.8% (20/255) for open surgery; P=0.897.

      Patients randomised to VATS had a shorter median (IQR) length of stay of 4 (3 to 7) versus 5 (3 to 8) days compared to patients randomised to open surgery, P=0.008.

      Conclusion

      In early stage lung cancer, VATS lobectomy is associated with significantly lower in-hospital complications and shorter length of stay compared to open lobectomy. This was achieved without any compromise to early oncologic outcomes (pathologic complete resection and upstaging of mediastinal lymph nodes) nor any difference in serious adverse events in the early post-operative period.

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    PR03 - Press Conference (ID 94)

    • Event: WCLC 2019
    • Type: Press Conference
    • Track:
    • Presentations: 1
    • Now Available
    • Moderators:
    • Coordinates: 9/09/2019, 10:15 - 11:00, CC7.1 A&B
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      PR03.05 - In Hospital Clinical Efficacy, Safety and Oncologic Outcomes from VIOLET: A UK Multi-Centre RCT of VATS Versus Open Lobectomy for Lung Cancer (Now Available) (ID 3616)

      10:15 - 11:00  |  Presenting Author(s): Eric Lim

      • Abstract
      • Presentation
      • Slides

      Abstract not provided

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