Non-small cell lung cancer (NSCLC) is the leading cause of cancer mortality worldwide. In recent years dramatic progress has been made in tailoring therapies for subgroups of patients harboring specific genomic alterations, such as EGFR tyrosine kinase inhibitors for the 10-15% of patients bearing EGFR mutations, and through the use drugs blocking the PD-1/PD-L1 immune checkpoint pathway. Unfortunately, only a minority of patients benefit from these approaches. LKB1 (STK11) is the second most commonly altered tumor suppressor in NSCLC, and is lost in 20-30% of lung adenocarcinoma, resulting in 30,000-40,000 deaths annually. There is a major unmet need for therapeutic strategies tailored for LKB1-deficient (LD) NSCLC. Project investigators have demonstrated that LKB1 loss is associated with increased metastatic potential, chemotherapy resistance, and, more recently, with an immunosuppressed phenotype as well as resistance to checkpoint inhibitors. Given our initial findings, we hypothesize that a) LKB1 loss directly drives a distinctve immunosuppressed phenotype, and that potential underlying mechanisms include reduced antigen presentation and/or altered cytokine production; and b) therapeutic regimens can be developed to enhance the antitumor immune response and overcome resistance to checkpoint inhibition. We will test these hypotheses in the following aims.
In Aim 1, we will characterize the immunosuppressed phenotype of LD-NSCLC, by a) investigating the mechanisms underlying the LD-associated intratumor immunosuppression in preclinical models, including reduced antigen presentation and altered production of immunosuppressive cytokines such as IL-6 and VEGF; and b) comparing the immune phenotype in LD and LKB1-intact (LI) tumors from NSCLC patients. Next, in Aim 2, we will use insights gained from Aim 1 to develop more effective immunotherapy approaches, by testing a) direct and indirect cytokine suppression, b) combinations of cytokine suppression with anti-PD1, to determine whether we can overcome the LD-associated resistance to checkpoint inhibition; and c) combinations with radiotherapy (RT) and other approaches enhancing antigen presentation. Finally, in Aim 3, we will translate this work into the clinic using a recently activated randomized clinical trial testing the anti-PD- antibody pembrolizumab, alone or combined with RT in 104 NSCLC patients. This will enable us to test our preclinical observations regarding the relative resistance of LD-NSCLC to PD-1 inhibition, and determine whether RT can enhance anti-tumor immunity and overcome PD-1 inhibitor resistance in LD NSCLC patients. Clinical significance: LD-NSCLC causes more deaths than pancreatic cancer, and there are critical unmet needs for new treatment approaches and insights into its distinct biology. We have assembled a multidisciplinary team of leading investigators to tackle these needs, with deep expertise in lung cancer genomics, immunotherapy, pathology, mouse models and radiotherapy that is poised to rapidly translate discoveries directly into clinical advances for NSCLC patients.
Therapeutic advances have been made in the treatment of subpopulations of non-small cell lung cancer (NSCLC) patients who harbor specific genomic alterations (e.g. EGFR mutation and ALK ROS gene rearrangements) which can be targeted with small molecule kinase inhibitors; however, the serine/threonine kinase STK11 (LKB1) is the second most commonly altered tumor suppressors in NSCLC, with genomic loss or inactivating mutations occurring in 20-30% of lung adenocarcinoma and there are currently no treatment strategies tailored for LKB1-deficient NSCLC. The PIs have developed preliminary data showing that in human tumor specimens and in Genetically Engineered Mouse Models of NSCLC with Lkb1 deletion that loss of LKB1 is associated with higher stage of disease at presentation, increased metastasis and poor overall prognosis as well as unique biological characteristics. This proposal will deeply characterize the distinct biology of LKB1- deficient NSCLCs with a focus on the immune microenvironment as a means to develop novel therapeutic approaches for patients with LKB1-deficient NSCLCs.
|Hai, Josephine; Liu, Shengwu; Bufe, Lauren et al. (2017) Synergy of WEE1 and mTOR Inhibition in Mutant KRAS-Driven Lung Cancers. Clin Cancer Res 23:6993-7005|
|Akbay, Esra A; Koyama, Shohei; Liu, Yan et al. (2017) Interleukin-17A Promotes Lung Tumor Progression through Neutrophil Attraction to Tumor Sites and Mediating Resistance to PD-1 Blockade. J Thorac Oncol 12:1268-1279|
|Liu, Yan; Li, Yuyang; Wang, Xiaoen et al. (2017) Gemcitabine and Chk1 Inhibitor AZD7762 Synergistically Suppress the Growth of Lkb1-Deficient Lung Adenocarcinoma. Cancer Res 77:5068-5076|
|Adeegbe, Dennis O; Liu, Yan; Lizotte, Patrick H et al. (2017) Synergistic Immunostimulatory Effects and Therapeutic Benefit of Combined Histone Deacetylase and Bromodomain Inhibition in Non-Small Cell Lung Cancer. Cancer Discov 7:852-867|
|Ferrarotto, Renata; Goonatilake, Ruchitha; Yoo, Suk Young et al. (2016) Epithelial-Mesenchymal Transition Predicts Polo-Like Kinase 1 Inhibitor-Mediated Apoptosis in Non-Small Cell Lung Cancer. Clin Cancer Res 22:1674-1686|
|Guijarro-Muñoz, Irene; Roarty, Emily B; Heymach, John V (2016) Bevacizumab beyond disease progression for advanced non-small cell lung cancer: Does persistence have its rewards? Cancer 122:1047-9|
|Nilsson, Monique B; Giri, Uma; Gudikote, Jayanthi et al. (2016) KDR Amplification Is Associated with VEGF-Induced Activation of the mTOR and Invasion Pathways but does not Predict Clinical Benefit to the VEGFR TKI Vandetanib. Clin Cancer Res 22:1940-50|
|Herter-Sprie, Grit S; Koyama, Shohei; Korideck, Houari et al. (2016) Synergy of radiotherapy and PD-1 blockade in Kras-mutant lung cancer. JCI Insight 1:e87415|
|Peng, Shaohua; Sen, Banibrata; Mazumdar, Tuhina et al. (2016) Dasatinib induces DNA damage and activates DNA repair pathways leading to senescence in non-small cell lung cancer cell lines with kinase-inactivating BRAF mutations. Oncotarget 7:565-79|
|Koyama, Shohei; Akbay, Esra A; Li, Yvonne Y et al. (2016) STK11/LKB1 Deficiency Promotes Neutrophil Recruitment and Proinflammatory Cytokine Production to Suppress T-cell Activity in the Lung Tumor Microenvironment. Cancer Res 76:999-1008|
Showing the most recent 10 out of 17 publications