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ORAL 25 - Biology and Other Issues in SCLC (ID 125)
- Event: WCLC 2015
- Type: Oral Session
- Track: Small Cell Lung Cancer
- Presentations: 1
ORAL25.05 - Predictive and Prognostic Significance of Myeloid-Derived Suppressor Cells in Patients with Small-Cell Lung Cancer (ID 571)
10:45 - 12:15 | Author(s): X. Liu
Myeloid-derived suppressor cells (MDSCs) play a key role in microenvironment for tumor progression and have been emerged as a promising target in immunotherapy for tumor. We reported the existence and characteristics of monocytoid MDSCs in peripheral blood of patients with small-cell lung cancer (SCLC). In this study, we further identify the predictive and prognostic of MDSCs in a larger cohort of SCLC patients.
60 healthy and 228 chemotherapy-naïve patients with SCLC participated. Peripheral venous blood samples prior to chemotherapy (baseline) and after the second cycle of chemotherapy (2[nd] cycle) were collected and detected for MDSCs (CD11b[+]HLA-DR[-]CD33[+]) by flow cytometry.
Median age of the patients was 58 years (range 18-79). MDSCs in limited-stage (n=147) and extensive-stage patients (n=81) were (16.41±8.54)% and (17.20±10.43)% respectively, higher than those in healthy control (11.04±3.76)%, P<0.001。The level of MDSCs were lower after 2[nd] cycle than those pre-treatment, (8.47±5.51)% versus (17.61±6.69)%, P<0.001. Patients with response to chemotherapy (CR+PR+SD) showed lower MDSCs level than those with progression disease at both time points, (15.85±9.07)% versus (18.42±8.89)%, P=0.026 at baseline and (8.20±5.31)% vs (10.65±6.73)%, P=0.045 after 2[nd] cycle. Patients with MDSCs level ≥22% (2 fold of healthy control) showed favorable overall survival than those with MDSCs level <22% (13.9 months versus 7.9 months respectively, log rank P=0.003). No difference regarding to median progression–free survival was observed between the two groups.
MDSCs level at both baseline and after the second cycle of chemotherapy was associated with response of SCLC patients to chemotherapy and overall survival, implying it is likely a new predictive and prognostic biomarker for SCLC patients.
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