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Tengfei Zhang
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EP1.12 - Small Cell Lung Cancer/NET (ID 202)
- Event: WCLC 2019
- Type: E-Poster Viewing in the Exhibit Hall
- Track: Small Cell Lung Cancer/NET
- Presentations: 1
- Now Available
- Moderators:
- Coordinates: 9/08/2019, 08:00 - 18:00, Exhibit Hall
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EP1.12-10 - Molecular Characterization of NSCLC-Like and SCLC-Like Subsets in Chinese Pulmonary Large-Cell Neuroendocrine Carcinoma (LCNEC) (Now Available) (ID 1341)
08:00 - 18:00 | Author(s): Tengfei Zhang
- Abstract
Background
LCNEC is an aggressive, biologically heterogenous carcinoma which can be molecularly characterized as SCLC-like and NSCLC-like. Accurate distinction of molecular subset is of major clinical relevance since it may guide treatment choices in LCNEC. Here we determined the genomic characteristics of the two LCNEC subsets in a Chinese cohort to clarify their correlations with traditional lung cancer histologies.
Method
FFPE samples from 31 LCNECs were sequenced using a 520-cancer-related gene panel, with an average sequencing depth of 1385X. Comparative mutational analysis was conducted between NSCLC-like LCNECs from our cohort and adenocarcinomas from TCGA dataset
Result
Despite similar clinical features in terms of stage and age at diagnosis, NSCLC-like (42%, 13/31) and SCLC-like (32%, 10/31) subsets from LCNEC displayed distinct molecular characteristics. NSCLC-like subset harbored significant higher mutation frequencies of STK11, KEAP1 and FAT3 (53.8%, 38.5% and 38.5%, p=.007, .046 and .046), while SCLC-like subset was characterized by highly mutated RB1 (100%, p<.001) and PTEN (50%, p=.007). Compared with TCGA adenocarcinomas, NSCLC-like LCNEC displayed more frequent mutations in TP53, STK11, APC, KMT2D and SMARCA4 (76.9%, 53.8%, 30.8%, 30.8% and 23.1%; p=.043, .004, .045, .005 and .049). In addition, potential targetable alterations were present in 46.2% (6/13) pts of NSCLC-like subset. For those advanced stage pts, 2/5 NSCLC-like and 5/5 SCLC-like pts received relevant chemotherapy according to their molecular characteristics. The clinical outcomes of these pts are still under follow-up.
Conclusion
This study demonstrates the distinct molecular features between NSCLC-like and SCLC-like subsets, and highlights the predominant genomic similarity and separate entities between NSCLC-like LCNEC with adenocarcinoma. Given the evidence that genomic profiling may aid in informing treatment decisions for pts with LCNEC, our study indicates that, based on accurate molecular typing, 46.2% NSCLC-like pts may benefit from potential targeted therapy and the rest of them may be more suitable to receive NSCLC-chemotherapy
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OA03 - Systemic Therapies for SCLC: Novel Targets and Patients' Selection (ID 121)
- Event: WCLC 2019
- Type: Oral Session
- Track: Small Cell Lung Cancer/NET
- Presentations: 1
- Now Available
- Moderators:Christine Lee Hann, Makoto Nishio
- Coordinates: 9/08/2019, 13:30 - 15:00, Hilton Head (1978)
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OA03.05 - Characterization of Genomic Alterations in Chinese LCNEC and SCLC via Comprehensive Genomic Profiling (Now Available) (ID 1486)
13:30 - 15:00 | Author(s): Tengfei Zhang
- Abstract
- Presentation
Background
LCNEC and SCLC are aggressive neuroendocrine carcinomas with overlap in clinical, histopathologic, morphologic and genomic features. Differential molecular features between the two subtypes have not been well elucidated, contributing the uncertainty for optimal clinical strategy for each subtype. Here we interrogated the genomic characteristics in LCNEC as compared to SCLC along with their histologically related subtypes: carcinoids and atypical carcinoids via comprehensive genomic profiling.
Method
FFPE samples from 31 LCNECs, 35 SCLCs, 14 carcinoids and 22 atypical carcinoids were sequenced in a CLIA-certified sequencing laboratory using 520-cancer-related gene panel, with an average sequencing depth of 1385X.
Result
Comparative mutational analysis revealed that both LCNEC and SCLC sub-cohorts displayed higher rate of TP53 alterations than that of carcinoid (p<0.001, p<0.001). SCLC patients harbored more RB1 and PIK3CA mutations than LCNECs (p<0.001, p=0.014) and carcinoids (p<0.001, p=0.018). In addition, mutation frequencies of LRP1B, FAT1, PRKDC, PIK3CA, NOTCH1, SPTA1 and EPHA3 in SCLC were significantly higher than that in carcinoid. Mutations in TP53 and RB1 occurred concurrently in 83% (29/35) SCLC patients, whereas in only 32.3% (10/31) LCNECs.（Fig.1） We further investigated the distribution of mutations across KEGG pathways and found that mutation frequencies in both HIF-1 and Notch signaling pathways were lower in LCNEC than SCLC (p=0.032, p=0.025). Copy number variation (CNV) analysis revealed that LCNEC and SCLC had comparable CNVs which were significantly higher than carcinoid (p<0.001, p<0.001) and atypical carcinoid (p=0.010, p=0.028). TMB analysis also revealed a comparable TMB status of LCNEC (12.7/Mb) and SCLC (11.9/Mb), and relatively lower TMB in both carcinoid (2.4/Mb, p<0.001, p<0.001) and atypical carcinoid (5.6/Mb, p=0.003, p=0.009) than LCNEC and SCLC.
Conclusion
We demonstrated the differential genomic characteristics in the four subtypes of neuroendocrine carcinomas. Compared with SCLC, LCNEC has lower mutation frequencies in RB1, PIK3CA, as well as HIF-1 and Notch signaling pathways. In addition, LCNEC and SCLC had comparable CNV and TMB status, which significantly higher than that of carcinoids and atypical carcinoid.
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P1.01 - Advanced NSCLC (ID 158)
- Event: WCLC 2019
- Type: Poster Viewing in the Exhibit Hall
- Track: Advanced NSCLC
- Presentations: 1
- Now Available
- Moderators:
- Coordinates: 9/08/2019, 09:45 - 18:00, Exhibit Hall
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P1.01-50 - Impact of Concomitant HER2 Alterations in Mediating Clinical Outcomes of EGFR-Mutant Patients to Different Generation of EGFR-TKIs (Now Available) (ID 1161)
09:45 - 18:00 | Author(s): Tengfei Zhang
- Abstract
Background
The 2nd generation EGFR-TKI are selective and potent irreversible pan-HER inhibitors. Given their effect on HER2 besides EGFR, we investigated the role of HER2 co-alterations in mediating the clinical outcomes of EGFR-mutant non-small cell lung cancers to 2nd generation or other generation EGFR-TKIs.
Method
Plasma/tissue samples from advanced NSCLC before and after 1L EGFR-TKI treatment were sequenced using 168-/520-cancer-related gene panels, respectively. Clinical records of 94 EGFR-mutant pts (92 adenocarcinomas and 2 adenosquamous cell carcinomas) after 1st/3rd (n=73) or 2nd generation (afatinib, n=16; dacomitinib, n=5) EGFR-TKI treatment were collected for clinical outcomes evaluation. Event-time distributions were estimated using Kaplan-Meier and compared with long-rank test.
Result
Among the 94 pts identified as EGFR-positive at baseline, 8 (8.5%) had concurrent HER2 gain-of-function alterations (amplification or active mutation). Survival analysis showed that for those with concomitant EGFR and HER2 alterations at baseline, pts achieved favorable PFS (23.2 vs 5.6 months, p=0.04) to 2nd generation (n=2) than to 1st/3rd generation EGFR-TKI (n=6) as 1L treatment. And for those receiving 1L 1st/3rd generation EGFR-TKI (n=73), the presence of baseline HER2 alterations (n=6) was associated with shorter PFS (5.6 vs 9.8 months, p=0.16) and OS (15.7 vs 21.0 months, p=0.06) than absence of HER2 (n=67), although the difference was not significant due to a small sample size. In addition, we found all the samples (n=21) obtained from pts after 2nd generation EGFR-TKI resistance were HER2-negative, but pts progressed on 1st or 3rd generation EGFR-TKI with HER2 as the only resistance mechanism were observed in our study cohort.
Conclusion
Our findings suggested that, for EGFR-mutant pts combined with HER2 alterations at baseline or those resistant to 1L treatment of 1st/3rd EGFR-TKI due to HER2 alterations only，2nd EGFR-TKI might be a better choice.Our findings suggested that, for EGFR-mutant pts combined with HER2 alterations at baseline or those resistant to 1L treatment of 1st/3rd EGFR-TKI due to HER2 alterations only，2nd EGFR-TKI might be a better choice.
