Adenocarcinoma

Despite significant progress in the development of novel biomarkers and therapies for lung cancer, such progress has not equitably benefitted all population groups in the United States (US). Racial and ethnic minorities, low income, uninsured, and underinsured individuals with non-small cell lung cancer (NSCLC) continue to experience disparate access to diagnostics tests and treatments, and experience inferior outcomes. These disparities are, at least, partially driven by social context (i.e., social determinants of health). Patients with NSCLC experience high rates of financial hardship and unmet supportive needs, making them a population likely to have high rates of health-related social needs. The prevalence of social needs in patients with NSCLC and their impact on healthcare utilization, cancer outcomes, and quality of life (QOL) remains unknown. To fill this important knowledge gap, we propose an observational, prospective cohort study of 150 patients with unresectable lung cancer receiving first-line systemic therapy. Our study has two primary goals (Aims): 1) Prospectively quantify the prevalence of social needs and determine the associations between social needs, acute care utilization, and QOL; 2) investigate how patient’s social needs influence oncology providers’ clinical decisions for outpatient cancer care of adults with unresectable NSCLC. To achieve these goals, we will conduct serial survey assessments of 150 patients with unresectable NSCLC and conduct semi-structured interviews with 30 oncology providers. This study is significant as it is the first study longitudinally evaluating social needs during cancer therapy in patients with NSCLC. This study will fill a key knowledge gap and inform interventions focused on identifying and supporting patients at risk of social adversity during cancer treatment.

Background: In recent years, an increasing incidence of lung cancer among young patients (<50 years) has been reported in Europe, Asia, and the United States. Young patients with lung cancer are more likely to be women, of Asian or Hispanic descent, have adenocarcinoma histology, and are more likely to present with distant metastases at diagnosis. Although young patients with lung cancer are more likely to be diagnosed at a disruptive time in their lives and face greater mental health and financial challenges than older patients with lung cancer, we lack data regarding their specific psychosocial needs. The lack of inclusion of young patients in survivorship studies has created a knowledge gap that we propose to remedy with the proposed study.

Aim and Hypothesis: The overarching aim of this study is to define the psychosocial needs of young patients with lung cancer and evaluate important cancer care delivery factors, including financial toxicity, gender and racial differences and study participants’ experiences with the healthcare system. We hypothesize that young patients will have greater unmet psychosocial needs and financial toxicity than older patients with lung cancer.

Methods: This study will utilize an expert, multi-disciplinary research team aligned with patient advocates to deploy an explanatory sequential mixed methods design to understand the needs of young patients with lung cancer. We will conduct a cross-sectional two-arm survey regarding psychosocial distress and financial toxicity among a diverse patient population utilizing two validated questionnaires, the Psychosocial Screen for Cancer (PSSCAN-R) questionnaire and the COmprehensive Score for financial Toxicity (COST) assessment. After the quantitative data collection is completed, we will conduct a preliminary analysis that will guide the discussion in the next phase, where we will conduct four focus groups with young patients with lung cancer to expand and obtain in-depth answers about the issues discovered in the survey portion of the study. The study team will collaborate with experienced biostatisticians and qualitative data researchers to conduct the appropriate statistical analysis.

Results and Dissemination Plan: The study results will be submitted to an international conference and later be published in a high-impact journal. In addition, we will disseminate the study results to the lung cancer patient community via a series of webinars; these webinars will be recorded and later shared with patient advocacy groups and lung cancer organizations.

Long-term Outcomes: Our data will yield insights to inform the oncology community of the barriers encountered by young patients with lung cancer and will allow us to develop the first clinical and research program for young patients with lung cancer in the nation.

Our laboratory has demonstrated the potency of the abscopal effect in studies showing that high-dose radiation therapy delivered to primary tumors in combination with dual immune checkpoint blockade can significantly inhibit the growth of satellite tumors. The implication of such results is that radiation therapy has remote effects which are immune-mediated and that new radiation protocols can be devised to exploit our naturally occurring defenses against cancer. Previous studies have shown that immune-mediated tumoricidal effects can be augmented by combining high-dose radiation therapy delivered to a primary tumor site with low-dose radiotherapy (LDRT) targeting secondary tumors. Tumor response is further enhanced if systemic agents are employed to induce immune-checkpoint blockade (ICB). Such protocols employing conventional LDRT are known to reduce the number of regulatory T cells (Tregs) and to activate natural killer cells, thereby modulating the tumor microenvironment (TME). Our laboratory project seeks to test a modification of LDRT called pulsed low-dose-rate radiotherapy (PLDR). By providing radiation in repeated very low doses, the PLDR regimen may reduce the encasement of tumors with stromal elements, thus removing a barrier to infiltrating immune-reactive cells. We propose to use the immunocompetent lung cancer murine model which we developed for our earlier research combining HDRT with anti-PD1 and anti-CTLA-4 antibodies. HDRT will again be delivered to primary tumors in combination with dual ICB. Additionally, LDRT will be delivered to secondary tumors, both in conventional form and as PLDR. The results will thus test an innovative method for exploiting the emerging synergies of radiation and ICB. A demonstration of the superior therapeutic utility of PLDR in our animal model would be of immediate relevance to clinical trials seeking improved strategies for treating patients with metastatic lung cancer.

Despite recent advances, locally advanced non-small cell lung cancer (LA-NSCLC) continues to have a high degree of morbidity and mortality related to both disease progression and sequelae from treatment. The purpose of this study is to develop and evaluate a more personalized radiation therapy (RT) approach with the potential to reduce time and financial burden to patients and increase tumor control. Patients undergoing fractionated RT with concurrent systemic therapy for LA-NSCLC will be treated to a total dose of 60 Gy with the number of fractions determined by ability to meet key dose constraints resulting in a shorter treatment course and higher biologic effective dose (BED) among those treated with shorter fractionation. To reduce the iterative time to determine fractionation schedule and standardize the"‘isotoxic hypofractionation" approach, we will employ a previously developed automated RT planning technique after delineation of the tumor and organs at risk. Fifty patients will be enrolled in a prospective non-randomized 2-stage trial to test the primary objective of whether isotoxic hypofractionation results in an acceptable rate of grade 2 or higher toxicity. Secondary endpoints will include G3+ toxicity, local control, progression free survival and overall survival. Finally, to better inform future "isotoxic" dosing strategies we will evaluate additional predictors of radiation toxicity using established retrospective cohorts through the Stanford Cancer Institute and the Veteran’s Affairs Information and Computing Infrastructure (VINCI).

Though the introduction of immune checkpoint inhibitors (ICI) has improved outcomes for patients with stage III non-small-cell lung cancer, most patients do not have robust tumor responses to ICI and real-world patients discontinue ICI due to toxicity at a higher rate than clinical trial populations. There is an unmet need to develop predictive models to identify patients at risk of poor ICI response, high risk of ICI toxicity, and high risk of non-cancer mortality, as these patients are unlikely to benefit from ICI and may require treatment intensification or de-intensification, selection of alternative therapies, or enrollment on clinical trials. In this proposal we seek to leverage the richness and national scale of Veterans Affairs (VA) clinical data to develop statistical models to predict ICI efficacy, toxicity, and non-cancer mortality. We will evaluate specific hypotheses generated from preclinical research and use machine-learning approaches to identify new predictors from high-dimensional VA healthcare data. These models will be integrated into a unified multistate model, allowing prediction of the individualized overall survival benefit of ICI for each patient. Clinical decision-making based on model predictions will be compared to other decision making strategies using decision-curve analysis. This work will identify novel biomarkers of ICI efficacy and toxicity, validate putative ICI effect modifiers from the preclinical literature, and develop the first unified model for ICI clinical benefit. If successful, this tool can be used for patient counseling, physician decision-making, and identification of patients likely to benefit from alternative therapies, treatment de-escalation, or clinical trial enrollment.

The targeted-therapy (TT) osimertinib is frontline standard-of-care for patients with advanced non-small cell lung cancer (NSCLC) harboring mutations in the epidermal growth factor receptor (EGFR) gene. However, nearly all patients develop resistance, at which point treatments are limited. While revolutionary for many cancers, anti-PD-(L)1 immune checkpoint blockade (ICB) has been ineffective in EGFR-mutated(m) NSCLC. Targeting angiogenesis, and specifically vascular endothelial growth factor (VEGF), may be key to changing this. VEGF promotes immunosuppression through multiple mechanisms including inhibition of cytotoxic T-cell trafficking and promotion of regulatory T-cell proliferation. Pre-clinical and clinical evidence has revealed activated EGFR to be a dominant regulator of angiogenesis in EGFRm NSCLC, with increased expression of VEGF and hypoxia inducible factor-1α observed in EGFRm compared to wild-type NSCLC. Clinically, combination chemotherapy with anti-PD-L1 and VEGF blockade has shown efficacy signals in EGFRm NSCLC. However, whether upregulated VEGF potentiates the uninflamed tumor immune microenvironment (TIME), and underlies the observed synergy of these therapies in EGFRm NSCLC, remains unexplored. It is further unknown if VEGF inhibition can be combined with PD-1 blockade to promote benefit in the absence of chemotherapy, or whether blockade of additional checkpoints can further expand anti-tumor immune populations, specifically NK cells, which appear to be upregulated in EGFRm NSCLC responsive to ICB. To address these impactful questions, we have designed a single-arm translationally-focused phase 2 clinical trial assessing the efficacy of tiragolumab (anti-TIGIT) plus atezolizumab (anti-PD-L1) and bevacizumab (anti-VEGF) in advanced TT-refractory, ICB-naïve, EGFRm NSCLC. Critically, the proposed analyses detailed herein of tumor and blood samples obtained pre- and on-treatment will focus on (1) immunopathologic features of ICB resistance in EGFRm-NSCLC and (2) TIME infiltration and immunologic reprogramming imparted by these therapies. The findings from this study will help to define the innate barriers preventing induction of durable anti-tumor immunity by ICB in EGFRm NSCLC, and identify strategies to overcome them.

Rearrangement of the BRAF gene results in a potent oncogene that is a driver in 2.8% of NSCLC with BRAF alterations. To date there is no approve targeted therapy for any cancer type with BRAF fusions. Studies by our group and others have shown that mutant-specific BRAF kinase inhibitors do no inhibit BRAF fusion kinases. Instead, pan-RAF inhibitors seem more effective as therapy for cancer cells harboring these fusions. We therefore hypothesize that targeting BRAF fusions with pan-RAF inhibitors are likely to be effective therapy for this molecularly defined subset of NSCLC. Our goal in this proposal is to generate the preclinical data necessary to propel a phase 1 clinical trial of a pan-RAF inhibitor specific to patients with NSCLC harboring a BRAF fusion. We have generated seven preclinical disease models with BRAF rearrangement, including two NSLC patient-derived xenograft models with matching cell lines that will allow this project to go forward immediately. In Aim 1 we propose to generate additional NSCLC PDX, organoid and cell line models that will expand the platforms available to examine the efficacy of these BRAF inhibitors. We will test the efficacy of three pan-RAF inhibitors (LY3009120, belvarafenib, KIN-2787) in vitro and in vivo in Aim 2. We believe that combination therapy may eventually be necessary to extend the duration of response to BRAF targeted therapy. To find candidates that can be exploited for combination therapy, in Aim 3 we will map the signaling pathways that are activated by BRAF fusions in isogenic cell lines and inhibited specifically by BRAF inhibitors in cells with BRAF fusions. Given that resistance to therapy is inevitable, we will seek to generate resistance to the three pan-RAF inhibitors in vitro and in vivo and then identify and validate potential mechanisms of resistance. To be able to bring the goals of this proposal to fruition, I have assembled a team with clinical, translational and basic research expertise to help guide me. As a thoracic oncologist with clinical trial expertise, I am ideally situated to translate the findings of this study to the clinic.

Although about a third of patients with non-small cell lung cancer (NSCLC) present with resectable disease, a majority will experience death and relapse from their cancer. Exciting recent advances in the use of immune checkpoint inhibition in this early stage space presents a promising way forward for our patients. As the most commonly mutated oncogene, activating KRAS mutations are found in 30% of lung adenocarcinomas; G12C mutations have been associated with higher risk of recurrence following resection. Adagrasib (MRTX849), a potent, highly selective novel small molecule inhibitor of KRAS G12C, has shown promise in previously treated advanced NSCLC. Our study represents a novel application of precision oncology in the resectable NSCLC disease setting with the neoadjuvant use of adagrasib monotherapy or in combination with immune checkpoint inhibition. We will identify safety and clinical efficacy signals of both of these therapeutic approaches. Leveraging our institutional expertise of using single- cell transcriptomics of tumor- infiltrating lymphocytes (TIL), we will evaluate neoantigen-specific transcriptional programs with a focus on KRAS-specific changes, and correlate with clinical outcomes. Overall, our study aims to ultimately improve cure rates of resectable KRAS G12C-mutated NSCLC.

Genomic discoveries of driver-gene alterations in lung cancer have led to development of effective target therapeutics; however patients who initially respond to the therapy inevitably experience regrowth of the disease. The reversible drug-tolerant persister (DTP) stage, where cells enter a quiescence, is gaining attention as a major source of non-genetic drug resistance. In our EGFR-TKI-induced DTP model, we found a marked overload of repressive chromatin modification (H3K9me3 and H3K27me3) reminiscent of a quiescent state. In Aim1, we seek to characterize the epigenomic dynamics of DTP stage in RET-positive lung cancer under Selpercatinib treatment, and determine the roles of histone-modifying enzymes on maintaining DTP stage as potential combinatorial therapeutic targets. The process of DTP development requires terminally differentiated cells to regain plasticity and undergo re-differentiation, while the origin of DTP plasticity remains unknown. A recent scRNA-seq study from lung cancer biopsies representing DTP states showed an elevated alveolar signature. During lung regeneration, an alveolar lineage factor HOPX is required for the AT1 plasticity to regenerate AT2 cells upon injury, suggesting a differentiation potential of HOPX(+) cells. Our data showed HOPX is an early marker for treatment-induced DTP and necessary for DTP development, where our scATAC-seq data exhibited increased epigenomic heterogeneity. We hypothesize DTP contains heterogeneous subpopulations that hijack developmental pathways to sustain plasticity for subsequent differentiation. In Aim2, we will determine the role of HOPX and associated developmental pathways in RET-induced DTP model, to identify novel targets determining the DTP plasticity thereby preventing relapse from heterogeneous pathways to acquire Selpercatinib resistance.

Fusions in the RET proto-oncogene account for ~2% of non-small cell lung cancers (NSCLC). Despite initial failures tied to the use of multi-kinase inhibitors, recent selective RET inhibitors have proven remarkably more successful. However, patients eventually recur on these therapies, highlighting the need for other therapeutic alternatives. Immunotherapies have been unsuccessful in patients harboring RET fusions, likely in part due to their low tumor mutational burden. Neoantigens are immunogenic antigens which are derived from somatic mutations, resulting in antigen-specific killing by T lymphocytes. Importantly, insertions, deletions, and gene fusions may exhibit increased immunogenicity, due to their accrued dissimilarity with unmutated transcripts and proteins, which may provide a unique opportunity to target RET fusions using T cell receptor engineering approaches. Accordingly, we hypothesize that RET fusions are immunogenic and can be effectively recognized using T cell receptor engineering approaches. To confirm this hypothesis, we propose to identify RET fusion-derived neoantigens, identify and isolate the T cells which recognize them, and engineer T cells to kill targets in vitro. Through this work, we aim to generate a library of TCRs which could be used off-the-shelf to target the two dominant RET fusions (KIF5B-RET=75%; CCDC6-RET=25%) and 10 most prevalent HLA alleles in the United States, in order to afford new therapeutic alternatives to the overwhelming majority of patients harboring RET fusions in NSCLC.