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JCSE01 - Joint IASLC-CSCO-CAALC Session (ID 63)
- Event: WCLC 2019
- Type: Joint IASLC-CSCO-CAALC Session
- Presentations: 1
- Moderators:Chunxue Bai, Tony Mok, Yi-Long Wu, Qing Zhou, Nan Wu
- Coordinates: 9/07/2019, 07:00 - 11:15, Toronto (1985)
JCSE01.20 - Pilot Study on the Tumor Immune Microenvironment Between Non-Small Cell Lung Cancer (NSCLC) and Small Cell Lung Cancer (SCLC) (ID 3434)
07:00 - 11:15 | Author(s): Jing Li
Tumor immune microenvironment plays an important role in immunotherapy and prognosis. However, the differences and the clinical significance between non-small cell lung cancer (NSCLC) and small cell lung cancer (SCLC) is still largely unknown.
Resected lung cancer FFPE specimens and matched peripheral blood mononuclear cells (PBMC) from six patients with NSCLC (three adenocarcinoma, three squamous cell carcinoma) and three patients with SCLC were collected. All of the nine patients underwent stage III disease. Tumor mutation burden (TMB) was evaluated by hybridization capture based next-generation sequencing with 1021 cancer associated genes. Tumor infiltrating lymphocytes (TILs) were assessed by immunohistochemistry using multiple immune markers and meanwhile the intratumoral T-cell repertoires were analyzed via high-throughput sequencing of TCR β-chain.
Typical EGFR mutations in adenocarcinoma (2 in 3), NSCLC and RB1 mutations in SCLC (3 in 3) were observed. SCLC patients showed significantly higher TMB than NSCLC. Regarding to the tumor immune microenviroment, SCLC tumors exhibited lower infiltration of CD3+ and CD8+ TILs (P< 0.05). Furthermore, we found that SCLC patients tended to have lower TCR Shannon index (P= 0.167) and higher Clonality index (P= 0.095). Interestingly, patients with higher Shannon index exhibited better Overall Survival (OS) while Clonality was potentially associated with decreased OS. However, further study with more patients is needed to confirm the results.
Tumor immune microenvironment varies between NSCLC and SCLC patients. Specifically, less prevalent and lower diversity of TILs were observed in SCLCs. This might potentially influence survival outcomes.