Virtual Library
Start Your Search
S. Peters
Author of
-
+
MS 05 - Tumor Heterogeneity (ID 23)
- Event: WCLC 2015
- Type: Mini Symposium
- Track: Biology, Pathology, and Molecular Testing
- Presentations: 1
- Moderators:S. Dacic, A.G. Nicholson
- Coordinates: 9/07/2015, 14:15 - 15:45, Mile High Ballroom 1a-1f
-
+
MS05.04 - Hetergeneity and Drug Resistance (ID 1867)
15:20 - 15:40 | Author(s): S. Peters
- Abstract
- Presentation
Abstract not provided
Only Members that have purchased this event or have registered via an access code will be able to view this content. To view this presentation, please login, select "Add to Cart" and proceed to checkout. If you would like to become a member of IASLC, please click here.
-
+
ORAL 02 - PD1 Axis Immunotherapy 2 (ID 87)
- Event: WCLC 2015
- Type: Oral Session
- Track: Treatment of Advanced Diseases - NSCLC
- Presentations: 1
- Moderators:E.B. Garon, H.J. Ross
- Coordinates: 9/07/2015, 10:45 - 12:15, Four Seasons Ballroom F1+F2
-
+
ORAL02.04 - Discussant for ORAL02.01, ORAL02.02, ORAL02.03 (ID 3291)
11:18 - 11:28 | Author(s): S. Peters
- Abstract
- Presentation
Abstract not provided
Only Members that have purchased this event or have registered via an access code will be able to view this content. To view this presentation, please login, select "Add to Cart" and proceed to checkout. If you would like to become a member of IASLC, please click here.
-
+
ORAL 37 - Novel Targets (ID 146)
- Event: WCLC 2015
- Type: Oral Session
- Track: Biology, Pathology, and Molecular Testing
- Presentations: 1
- Moderators:S.S. Ramalingam, E. Thunnissen
- Coordinates: 9/09/2015, 16:45 - 18:15, Mile High Ballroom 4a-4f
-
+
ORAL37.05 - Prevalence and Clinical Association of MET Gene Amplification in Patients with NSCLC: Results from the ETOP Lungscape Project (ID 444)
17:28 - 17:39 | Author(s): S. Peters
- Abstract
Background:
The reported prevalence of MET gene amplification in non-small cell lung cancer (NSCLC) varies from 0-21% and clinical correlations are emerging slowly. In a well-defined NSCLC cohort of the ETOP Lungscape program, we explore the epidemiology, the natural history of MET amplification and its association with MET overexpression, overall survival (OS), relapse-free survival (RFS) and time to relapse (TTR).
Methods:
Resected stage I-III NSCLC, identified based on the quality of clinical data and FFPE tissue availability, were assessed for MET gene copy number (GCN) and expression analysis using silver in-situ hybridization (SISH) and immunohistochemistry (IHC), respectively, on TMAs (MET and centromere-specific probes; anti total c-MET antibody, clone SP44; Ventana immunostainer). MET amplification was defined as MET/centromere ratio ≥2 with average MET GCN ≥4, high MET GCN at two levels as ≥median CGN and ≥5 (irrespective of amplification) and MET IHC+ as 2+ or 3+ intensity in ≥50% of tumor cells. Sensitivity analysis to define the amplification’s thresholds was also performed. All cases were analysed at participating pathology laboratories using the same protocol, after successful completion of an external quality assurance (EQA) program.
Results:
Currently 2709 patients are included in the Lungscape iBiobank (median follow-up 4.8 years, 53.3% still alive). So far, 1547 (57%) have available results for MET GCN with amplification detected in 72 (4.7%; 95%CI: 3.6%, 5.7%) and high MET GCN (≥5) in 65 (4.2%; 95%CI: 3.2%, 5.2%). The median value of average MET GCN per cell is 2.3. IHC MET expression is available for 1515 (98%) of these cases, 350 (23%) of which are MET IHC positive [170 cases (49%) 3+, 180 (51%) 2+]. The median age, for the cohort of 1547 patients, is 66.2 years, with 32.8% women, and 13.5%, 29.7%, 54% never, current, former smokers, respectively. Stage distribution is: IA 23.6%, IB 24.6%, IIA 17%, IIB 12.1%, IIIA 20.9%, IIIB 1.8%, while 52.7%, are of adenocarcinoma and 40.0% of squamous histology. MET amplification and high MET GCN (≥5) are not significantly associated with any histological tumor characteristics or stage (multiplicity adjusted alpha: 0.005). High MET GCN (≥2.3) is less frequent in current smokers (38.3% vs. 55.6% for former or non-smokers, p<0.001). MET amplification and high MET GCN are significantly associated with IHC MET positivity (p<0.001 in all cases). MET amplification is present in 9.7% of IHC MET+ vs 3.1% of IHC MET- patients and high MET GCN (≥5) in 8.6% of IHC MET+ vs 2.8% of IHC MET- patients. MET amplification ranges from 0 to 16% between centers, while high MET GCN (≥5) and (≥2.3) from 0% to 12%, and 11.8% to 98.9%, respectively. MET amplification and both levels of high MET GCN are not associated with OS, RFS or TTR.
Conclusion:
The preliminary results for this large, predominantly European, multicenter cohort demonstrate that MET amplification assessed by SISH prevails in 4.7% of NSCLC, is associated with strong MET expression, and has no influence on prognosis. The large inter-laboratory variability in GCN despite EQA efforts may highlight a critical challenge of MET SISH analysis in routine practice.
-
+
P3.04 - Poster Session/ Biology, Pathology, and Molecular Testing (ID 235)
- Event: WCLC 2015
- Type: Poster
- Track: Biology, Pathology, and Molecular Testing
- Presentations: 2
- Moderators:
- Coordinates: 9/09/2015, 09:30 - 17:00, Exhibit Hall (Hall B+C)
-
+
P3.04-009 - Evaluation of RT-PCR Methodology for ALK Assessment in Patients with NSCLC in Europe: Results from the ETOP Lungscape Project (ID 1506)
09:30 - 09:30 | Author(s): S. Peters
- Abstract
Background:
ALK rearrangement is documented in 2%-7% of NSCLC, depending on the population studied and detection method used. Although the reverse transcriptase-polymerase chain reaction (RT-PCR) was the first used and published method, fluorescence in situ hybridization (FISH) has become the primary standard diagnostic method. Recently, immunohistochemistry (IHC) has also proven to be a reproducible, faster and sensitive technique. This is one of the first studies concurrently comparing all three techniques in resected lung adenocarcinomas from the large ETOP Lungscape cohort.
Methods:
95 cases from the ETOP Lungscape iBiobank, selected based on any degree of IHC staining (clone 5A4 antibody, Novocastra, UK), were examined by ALK FISH (Abbott Molecular, Inc.; Blackhall, JCO 2014) and central RT-PCR. For the latter, formalin-fixed, paraffin-embedded (FFPE) unstained slides were collected from participating centers. Slides were de-paraffinized, Toluidine Blue stained, and tumors macro-dissected. Tissue digestion and RNA extraction were performed (Qiagen RNeasy FFPE Kit). Using primers described in the literature covering most of ALK known translocations, RT-PCR (Superscript One-Step RT-PCR with Platinum Taq – 40 loops) was performed, followed by capillary electrophoresis in two separate mixes. Co-amplification of B-actin was done to validate the procedure and RNA quality. All tests were duplicated.
Results:
76 of 95 RT-PCR had adequate RNA quality (B-actin co-amplification present). Among these, 18 were FISH positive, 16 were RT-PCR positive, including EML4-ALK V3a/b in 7, V1 in 5, V2 in one, and undetermined variants in 3 cases. 53 of 54 FISH negative cases were also RT-PCR negative (98%). 15 of 18 FISH positives harbored a translocation by RT-PCR (83%). Among the 4 discrepant cases, 2 FISH+/RT-PCR- cases had IHC H-scores of 180 and 260, and 98.3% and 95% of rearranged cells by FISH, probably corresponding to variants not covered by the RT-PCR. One had an IHC H-score of 5, and 16% cells rearranged on FISH, most probably corresponding to a FISH false positive case. The last had an IHC H-score of 200, 13% rearranged cells by FISH, and, thus is defined as a false negative FISH result. Provided IHC is defined as positive by an H-score above 120, all but one case (H-Score 20, FISH and RT-PCR positive) gave concordant results by a combination of FISH and RT-PCR. Overall, using as true negative or true positive the concordant result of two of the methods, the third method is characterized by high specificity and sensitivity with corresponding values of 100/98/100% and 94/94/89% for IHC/FISH/RT-PCR, respectively.
Conclusion:
RT-PCR is a very good tool for sorting discordant IHC/FISH cases, however, we do not recommend using this technique as single method due to the lower sensitivity of RT-PCR, as not all variants are covered, and also due to the limitations with RNA preservation.
-
+
P3.04-053 - SPECTAlung: Screening Patients with Thoracic Tumors for Efficient Clinical Trial Access (ID 1386)
09:30 - 09:30 | Author(s): S. Peters
- Abstract
Background:
The identification of molecular alteration and its targeting has completely changed the treatment and prognosis of lung cancer. However, designing and implementing clinical trials in small subsets of patients with a particular molecular alteration is challenging because of lack of uniform screening program. Across Europe, screening for molecular alterations is center or country dependent and, generally limited to a small subset of genes. SPECTAlung is the first European standardized, quality-assured molecular screening program of the European Organization for the Research and Treatment of Cancer (EORTC) in collaboration with the European Thoracic Oncology Platform (ETOP) to facilitate clinical trial access for patients with thoracic tumors. It is expected to test 500 to 1000 patients each year with the overall goal of offering patients clinical trials with targeted agents.
Methods:
Patients sign the informed consent for their tumor tissue to be collected, centralized and processed according to defined international quality control standards at Gustave Roussy Biobank (Villejuif, France). Next Generation Sequencing (NGS) is performed at Sanger Institute (Cambridge, UK) where a panel of about 360 genes is analyzed for mutation, rearrangements and gene copy number. Eligible patients will be those having a pathological diagnosis of any thoracic tumor (lung cancer, malignant pleural mesothelioma and thymic malignancies) at any stage of disease, availability of tumor tissue, age at least 18 years, PS 0-2, life expectancy > 3 months, no active malignancy in the 5 years before study entry and absence of any exclusion criteria that may prevent inclusion into clinical trials. A molecular report will be released to the investigator highlighting identified molecular alterations and also the trials for which the patients might be eligible. The study has been submitted to ethical committees of 15 selected highly specialized and qualified thoracic centres in 12 countries in Europe. EORTC and ETOP will promote the implementation of clinical trials in molecularly selected groups of patients at the SPECTAlung centers. SPECTAlung offers innovative and attractive models of collaboration with commercial and research organizations, by improving patient access to novel therapeutic clinical trial and support the development of personalized medicine. Clinical trial registry number NCT02214134.
Results:
Not applicable
Conclusion:
Not applicable
