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Microarray gene expression profiles of peripheral blood mononuclear cells in patients with advanced stage non-small cell lung cancer treated with first line combination chemotherapy

ABSTRACT: We have extended our investigation to advanced-stage NSCLC by analyzing gene expression in peripheral blood mononuclear cells (PBMC) from patients with newly-diagnosed NSCLC and histopathology of either AC or SCC. Furthermore, to establish a direct link between gene expression and chemotherapy treatment, PBMC from patients who have received 4 courses of combination chemotherapy with CDDP and GEM were obtained, and the effects of chemotherapy on global gene expression were evaluated using microarray analyses. We analyzed microarray gene expression profiles of peripheral blood mononuclear cells from 30 patients with newly-diagnosed advanced stage NSCLC, and 20 age, sex, and co-morbidity-matched healthy controls (HC). All the cancer patients received a maximum of six courses of chemotherapy with cisplatin and gemcitabine of a 28-day cycle as first line treatment.Furthermore, to establish a direct link between gene expression and chemotherapy treatment, PBMC from patients who have received 4 courses of combination chemotherapy with CDDP and GEM were obtained, and the effects of chemotherapy on global gene expression were evaluated using microarray analyses.

ORGANISM(S): Homo sapiens

SUBMITTER: chen yungche

PROVIDER: S-ECPF-GEOD-39345 | biostudies-other |

REPOSITORIES: biostudies-other

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Project description:IntroductionIncreasing evidence has shown that immune surveillance is compromised in a tumor-promoting microenvironment for patients with non-small cell lung cancer (NSCLC), and can be restored by appropriate chemotherapy.MethodsTo test this hypothesis, we analyzed microarray gene expression profiles of peripheral blood mononuclear cells from 30 patients with newly-diagnosed advanced stage NSCLC, and 20 age-, sex-, and co-morbidity-matched healthy controls. All the patients received a median of four courses of chemotherapy with cisplatin and gemcitabine for a 28-day cycle as first line treatment.ResultsSixty-nine differentially expressed genes between the patients and controls, and 59 differentially expressed genes before and after chemotherapy were identified. The IL4 pathway was significantly enriched in both tumor progression and chemotherapy signatures. CXCR4 and IL2RG were down-regulated, while DOK2 and S100A15 were up-regulated in the patients, and expressions of all four genes were partially or totally reversed after chemotherapy. Real-time quantitative RT-PCR for the four up-regulated (S100A15, DOK2) and down-regulated (TLR7, TOP1MT) genes in the patients, and the six up-regulated (TLR7, CRISP3, TOP1MT) and down-regulated (S100A15, DOK2, IL2RG) genes after chemotherapy confirmed the validity of the microarray results. Further immunohistochemical analysis of the paraffin-embedded lung cancer tissues identified strong S100A15 nuclear staining not only in stage IV NSCLC as compared to stage IIIB NSCLC (p?=?0.005), but also in patients with stable or progressive disease as compared to those with a partial response (p?=?0.032). A high percentage of S100A15 nuclear stained cells (HR 1.028, p?=?0.01) was the only independent factor associated with three-year overall mortality.ConclusionsOur results suggest a potential role of the IL4 pathway in immune surveillance of advanced stage NSCLC, and immune potentiation of combination chemotherapy. S100A15 may serve as a potential biomarker for tumor staging, and a predictor of poor prognosis in NSCLC.

Project description:The impact of combining epidermal growth factor receptor tyrosine kinase inhibitors (EGFR-TKIs) and chemotherapy as first-line therapy for patients with advanced non-small-cell lung cancer (NSCLC) remains controversial. Therefore, randomized trials that compared this combined regimen with chemotherapy or EGFR-TKIs monotherapy were included for this meta-analysis. We used published hazard ratios (HRs), if available, or derived treatment estimates from other survival data. Pooled estimates of treatment efficacy of the combined regimen in the entire unselected population and selected patients by EGFR-mutation status and smoking history were calculated. Eight trials eventually entered into this meta-analysis, including 4585 patients. Overall, the combined regimen significantly delayed disease progression (HR?=?0.81, 95% CI 0.69-0.95, P?=?0.01); subgroup analysis showed significantly higher progression free survival advantages in Asian patients (P<0.001), with sequential combination of TKIs and chemotherapy (P?=?0.02). In selected patients by EGFR-mutation, both mutation positive (HR?=?0.48, 95% CI 0.28-0.83, P?=?0.009) and negative (HR?=?0.84, 95% CI 0.72-0.98, P?=?0.02) patients gained progression free survival benefit from the combined regimen, albeit the magnitude of benefit was marginally larger in mutation positive patients (P?=?0.05). In selected patients by smoking history, never/light smokers achieved a great progression free survival benefit from the combined regimen (HR?=?0.51, 95% CI 0.35-0.74, P?=?0.0004). Unfortunately, the combined regimen had no significant impact on overall survival, irrespective of ethnicity, dose schedules or EGFR-mutation status. Severe anorexia (RR?=?2.01, 95% CI 1.11-3.63; P?=?0.02) and diarrhea (RR?=?2.70, 95% CI 1.94-3.76; P<0.001) were more frequent in the combined regimen arm. This strategy of combining EGFR-TKIs and chemotherapy deserved to be considered in the future, although it is not approved for advanced NSCLC at the moment.

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Microarray gene expression profiles of peripheral blood mononuclear cells in patients with advanced stage non-small cell lung cancer treated with first line combination chemotherapy

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