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Hee Jin Cho



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    P1.04 - Immunooncology (Not CME Accredited Session) (ID 936)

    • Event: WCLC 2018
    • Type: Poster Viewing in the Exhibit Hall
    • Track:
    • Presentations: 1
    • Moderators:
    • Coordinates: 9/24/2018, 16:45 - 18:00, Exhibit Hall
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      P1.04-03 - Suppressive Immune Cell Profiling in Patients with Non-Small Cell Lung Cancer. (ID 12878)

      16:45 - 18:00  |  Author(s): Hee Jin Cho

      • Abstract

      Background

      The factors in tumor microenvironment hinder T cell activities against tumor cells. The major immunosuppressive cells in tumor sites are myeloid derived suppressor cell (MDSC), tumor associated macrophage (TAM), and regulatory T (Treg) cell, and the effector molecules released by those immunosuppressive cells also regulate T cell activities. Therefore, in this study we examined the pattern of immunosuppressive cells in patients with non-small cell lung cancer depending on their stages and we compared those immunosuppressive cells in healthy donor blood PBMC as well. Then, we tested T cell activities to verify whether suppressive immune cell populations can influence T cell activity.

      a9ded1e5ce5d75814730bb4caaf49419 Method

      Granulocytic-MDSC, Monocytic-MDSC, TAM, and Treg population from patients’ PBMC (n=59) and healthy donors’ PBMC (n=20) were analyzed by FACS Verse with appropriate antibodies. For suppressive assay, isolated T cells were activated with anti-CD3 and anti-CD28 for an hour and then MDSC was co-cultured with T cells for a week followed by Ki-67 level analysis by FACS Verse. T cell activity and suppression were tested by FACS analysis with identified cell surface markers.

      4c3880bb027f159e801041b1021e88e8 Result

      G-MDSC (p-value=0.0023) and M-MDSC (p-value=0.0032) population were higher in advanced non-small cell lung cancer patients (stage III&IV) compared with stage I&II patients or healthy donor. G-MDSC isolated from patient’s blood was co-cultured with activated T cells from the same patient. After one week, T cell activity was dramatically inhibited compared with T cell alone (p < 0.001, E:T = 5:1, 10:1) confirming suppressive activity of MDSC against T cells. TAM population was increased as disease progressed (p<0.001), and Treg also slightly increased (p-value=0.0373) in stage III&IV. Activated T cells were higher in stage III&IV, but suppressed T cells were also higher in stage III&IV compared with stage I&II.

      8eea62084ca7e541d918e823422bd82e Conclusion

      G-MDSC and M-MDSC population increased as disease progressed and G-MDSC effectively suppressed T cell activities. TAM population increased in advanced non-small cell lung cancer patients, and Treg population also slightly increased in stage III&IV. Both activated and suppressed T cells were higher in stage III&IV compared with stage I&II.

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