Start Your Search
OA20 - Immunotherapy and Markers (ID 401)
- Event: WCLC 2016
- Type: Oral Session
- Track: Biology/Pathology
- Presentations: 1
OA20.06 - Prospective ImmunogenomiC PrOfiling of Non-Small Cell Lung Cancer - The ICON Project (ID 5560)
11:00 - 12:30 | Author(s): E. Bogatenkova
Previous attempts to define tumor and stromal immunologic environment in non-small cell lung cancer (NSCLC) utilized archival tissue. We established prospective comprehensive immonogenomic profiling protocol in NSCLC (ICON Project). The goal is to integrate immunomic, genomic, transcriptomic, proteomic, demographic, clinical, pathologic, and outcome data from 100 surgically resected early stage NSCLC.
Tumor and normal lung tissue are collected at the time of surgery, blood samples before and after surgery. Tumor samples are processed for tumor infiltrating lymphocyte (TILs) isolation and expansion; development of patient derived xenografts (PDX), immunohistochemical immune markers, and immunopeptidome profiling. Blood samples are analyzed with flow cytometry.
57 patients with median age of 65 years (27 males) have been enrolled within 5 months, of which 33 (66%) contributed samples to the study. Four were never smokers, with others being former or current smokers. Majority (N=27) had adenocarcinoma, 4 squamous cell carcinoma, and 2 pleomorphic carcinoma. 15 patients had stage I, 11 stage II, and 7 stage III disease; 5 patients received induction chemotherapy. Median tumor size was 3.5 cm and 29 underwent R0 and 4 R1 resection. Pre-REP TIL expansion was successful in the majority of samples (68.2%, n=22). Twelve PDX models with a take rate of 40% have been generated. Interim analysis of tumor samples by IHC demonstrated higher median distribution of all cell types: CD3+ T cells, cytotoxic T cells CD8+, PD1+ cells, tumor associated macrophages (TAM) CD68+, TAM CD68+PD-L1+, CD20+B cells, memory T cells CD45R0, natural killer cells CD57+, regulatory FOXP3+ T cells, and cytotoxic granzyme B cells (cells/mm) in the stroma as compared to the tumor compartment. Intra-tumoral regulatory FOXP3+T cells were more abundant in squamous cell carcinomas compared to adenocarcinomas (median 312 vs 51 cells/mm, p = 0.05). Higher concentration of intra-tumoral CD68+PD-L1+ expressing cells was observed following neoadjuvant chemotherapy (median 97 vs 60 cells/mm no chemo; p= 0.077), as was the concentration of memory T cells CD45R0 (median 129 vs 30 cells/mm, no chemo; p = 0.077). Mass spectrometry-based immunopeptidome analysis identified several thousand peptides, of which 4 promising antigens have been chosen for further development as immunotherapeutic T-cell targets.
The ICON is an ongoing, ambitious prospective project that aims to define the baseline immunologic characteristics of surgically resectable NSCLC. The rapid enrollment illustrates the enthusiasm for tumor immunoprofiling amongst patients and physicians alike. Data from this patient cohort will serve as a baseline comparison for upcoming neoadjuvant immunotherapy trials.
Only Active 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 or select "Add to Cart" and proceed to checkout.
P1.05 - Poster Session with Presenters Present (ID 457)
- Event: WCLC 2016
- Type: Poster Presenters Present
- Track: Early Stage NSCLC
- Presentations: 1
- Coordinates: 12/05/2016, 14:30 - 15:45, Hall B (Poster Area)
P1.05-028 - Phenotypic and Functional Profiling of Tumor-Infiltrating Lymphocytes (TIL) in Early Stage Non-Small Cell Lung Cancer (NSCLC) (ID 6044)
14:30 - 15:45 | Author(s): E. Bogatenkova
The ICON study aims to perform a comprehensive immunogenomic characterization of early stage localized non-small cell lung cancer (NSCLC) and lay the foundation for the identification of barriers to tumor immunity that may be targeted in future trials. Earlier work has demonstrated the prognostic significance of TIL in localized NSCLC. This work evaluates the functional status of T cells infiltrating the NSCLC tumors and their capacity to expand ex-vivo and perform effector function in the first 22 patients enrolled.
Patients enrolled on the ICON study underwent surgery. Fresh tumor samples were mechanically disaggregated and immediately stained for flow cytometry. Panels consisted of markers of T cell subsets, differentiation status, T cell function, activation and exhaustion. PD-L1 expression was assessed on malignant cells as well as CD68+ tumor-associated macrophages (TAMs) by IHC. Fragments from the tumor tissue were also placed in culture in media containing IL-2 for ex-vivo TIL expansion. TIL cultures were maintained for 3-5 weeks and subsequently underwent phenotypical and functional characterization.
Analysis of freshly disaggregated tumor tissue (n=22) from NSCLC tumor or adjacent normal tissue by flow cytometry demonstrated that effector CD8[+] T cells found in the tumor were less functional than T cells infiltrating normal tissue, revealed by a decrease in the co-expression of the cytotoxic effector molecules perforin and granzyme B (p=0.0004) together with an enhanced expression of the inhibitory receptor PD-1 (p<0.0001). Immunohistochemistry analysis showed PD-L1 expression on malignant cells and/or CD68+ TAMs on all tumor samples except one, strongly suggesting that the PD-1/PD-L1 inhibitory axis was engaged contributing to decreased T cell functionality. TIL could be expanded from the majority of samples (68.2%, n=22). The degree of infiltration predicted the ability to grow TIL ex-vivo (median CD3+ infiltrate of 15.25% of live cells in disaggregated tumor tissue for samples from which TIL could be grown versus 2.9% when TIL could not grow p = 0.015). Immunophenotyping following expansion showed an enrichment in CD8+ aβTCR+ T-cells expressing both perforin and granzyme B indicating that TILs propagated with IL-2 regained functionality (p=0.016). Lastly, NSCLC TIL were rapidly expanded using anti-CD3 antibody, feeder cells and IL-2 over two weeks (n=6) and reached clinically relevant numbers for TIL ACT (range 381-1282 fold expansion).
Overall, while TILs present in NSCLC are functionally inhibited, they can be expanded ex-vivo from most tumor samples and regain a functional phenotype for potential use in adoptive T-cell therapy.