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O12 - Lung Cancer Biology II (ID 87)
- Event: WCLC 2013
- Type: Oral Abstract Session
- Track: Biology
- Presentations: 1
- Moderators:Y. Nakanishi, B. Solomon
- Coordinates: 10/29/2013, 10:30 - 12:00, Parkside 110 A+B, Level 1
O12.06 - Hedgehog/Gli Promotes Epithelial-Mesenchymal Transition in Non-Small Cell Lung Cancer (ID 2091)
10:30 - 12:00 | Author(s): D. Yue
A majority of non-small cell lung cancer (NSCLC) patients are diagnosed with metastatic phenotypes. Epithelial-to-Mesenchymal Transition (EMT), characterized by loss of epithelial markers, such as E-cadherin, is suggested to be involved in the metastatic process. In addition, aberrant activation of the Hedgehog-Gli(Hh/Gli) signaling pathway is implicated in various cancers, including NSCLC. We hypothesize that the Hh/Gli signaling pathway may regulate EMT in NSCLC, and inhibition of Hh/Gli pathway may provide a novel strategy to treat NSCLC and prevent metastasis.
Tumor tissues of 324 NSCLC patients were analyzed by immunohistochemistry for Gli and E-cadherin expression. Mechanistic studies were carried out in four NSCLC cell lines, A549, H1666, H2170 and H1703. Our lab has developed a novel small molecule Gli inhibitor (Gli-I )that effectively suppresses lung cancer in vitro and in vivo. Gli-I and a Smoothened inhibitor vismodegib were applied to suppress Hh/Gli signaling, while Hh protein was utilized to stimulate the pathway. Upon different treatments, EMT phenotypes were evaluated by wound healing assays and 3D cell invasion assays. Expression of EMT markers was measured by immunofluorescent staining and western blot at protein levels, as well as quantitative RT-PCR at mRNA levels.
Our results demonstrated elevated Gli expression in 78% of NSCLC patient tissues. Gli expression was reversely correlated with E-Cadherin in patient tissues and culture cell lines. Inhibition of Hh signaling reduced cell migration and invasion, while stimulation of Hh signaling promoted EMT phenotypes. Specifically, Gli-I significantly suppressed cell proliferation, migration and invasion more effectively than vismodegib. Furthermore, mechanistic studied showed Hh/Gli signaling may regulate EMT through suppressing E-Cadherin.
Our results suggested that SHh/Gli signaling promotes cell proliferation and EMT, leading to NSCLC cell invasion and metastasis. Inhibition of Hh/Gli signaling by a novel Gli inhibitor Gli-I suppresses cell proliferation and invasion. Our novel Gli inhibitor holds the promise to provide an effective therapeutics to treat NSCLC and prevent metastasis.
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P2.11 - Poster Session 2 - NSCLC Novel Therapies (ID 209)
- Event: WCLC 2013
- Type: Poster Session
- Track: Medical Oncology
- Presentations: 1
- Coordinates: 10/29/2013, 09:30 - 16:30, Exhibit Hall, Ground Level
P2.11-002 - A Prospective, Open-labeled, Randomized, Multicenter Phase II Study to Evaluate Efficacy and Safety of Erlotinib vs NP Chemotherapy as Adjuvant Therapy in Post Radical Operation stage IIIA NSCLC Patients With EGFR 19 or 21 Exon Mutation (EVAN, ML28280, NCT01683175) (ID 316)
09:30 - 16:30 | Author(s): D. Yue
Stage IIIA NSCLC represents a relatively heterogeneous group, which the relative roles of treatment modalities are not clearly defined. Adjuvant chemotherapy remains the most important treatment for stage IIIA NSCLC after radical operation, but the drug-related toxicities limit its use and benefits for patients. The tyrosine-kinase inhibitor might provide a promising treatment for NSCLC patients with EGFR19 or 21 exon mutation. In the OPTIMAL study comparing first-line erlotinib with carboplatin/gemcitabine in advanced NSCLC patients with EGFR activating mutations, the primary analysis showed significantly prolonged progressive free survival in erlotinib treatment in comparison to carboplatin/gemcitabine (p<0.0001). The aim of this study is to investigate the efficacy and safety of erlotinib in comparison to vinorelbin plus cisplatin (NP) chemotherapy as adjuvant therapy in post radical operation stage IIIA NSCLC patients with EGFR19 or 21 exon mutation to explore a new treatment strategy for this subset.
The study was designed as a prospective, open-labeled, randomized, multicenter phase II clinical trial. Patients aged between 18 and 75 with ECOG PS 0–1 IIIA NSCLC confirmed by histopathology or cytology after radical operation and with EGFR exon 19 deletion mutation or exon 21 L858R single base substitution were enrolled (n=94). Within 4 weeks post radical surgery, the enrolled patients would randomly allocated for adjuvant therapy, receiving either erlotinib (n=47) 150mg/day for 2 years or NP (n=47) chemotherapy (vinorelbine 25mg/m2 on day 1, 8 and cisplatinum 75mg/m2 on day 1 of a 3-week schedule ) for 4 cycles. Duration of trial recruitment is estimated to 18 months. Primary endpoint is 2-year disease free survival rate (DFSR). Secondary endpoints are disease free survival (DFS), 3-year and 5-year overall survival (OS), Quality of Life (QOL) and Safety. Biomarker profile will be the exploratory research. Patients after surgery and therapy will receive long-term follow-up including chest and abdominal CT scan every 3 months, brain MRI every 6 months and bone scan every 12 months for up to 2 years.
Current recruitment: twenty-five patients have been enrolled since FPI in August, 2012.
Adjuvant erlotinib therapy in IIIA-N2 NSCLC with EGFR activating mutation is a promising strategy.