BackgroundOverexpression of microRNA-182 (miR-182) is found in various human cancers, including non-small cell lung cancer (NSCLC). Our aim is to investigate the association of miR-182 expression with the sensitivity of NSCLC to cisplatin.MethodsTaqMan RT-PCR or Western blot assay was performed to detect the expression of mature miR-182 and programmed cell death 4 (PDCD4) protein. miR-182 and (or) PDCD4 depleted cell lines were generated using miR-182 inhibitor and (or) siRNA. The viabilities of treated cells were analyzed using MTT assay.ResultsThe expression level of miR-182 in A549 cell line was significantly higher than that in NHBE cell line (p < 0.01). Transfection of miR-182 inhibitor induced sensitivity of A549 cells to cisplatin. A549 cells transfected with PDCD4 siRNA became more resistant to cisplatin therapy. We found an increase PDCD4 protein level following the transfection of miR-182 inhibitor using Western blot analysis. In addition, the enhanced growth-inhibitory effect by miR-182 inhibitor was weakened after the addition of PDCD4 siRNA.ConclusionsThe results of the present study demonstrated that overexpression of miR-182 may involve in chemoresistance of NSCLC cells to cisplatin by down-regulating PDCD4.Virtual SlidesThe virtual slide(s) for this article can be found here: http://www.diagnosticpathology.diagnomx.eu/vs/1793467320130186

The purpose of this study is to compare the efficacy and safety of Gefitinib versus VMP in combination with three-dimensional conformal radiotherapy (3D-CRT) for multiple brain metastases from non-small cell lung cancer (NSCLC). A total of 73 NSCLC patients with brain metastases from January 2010 to August 2013 were randomly divided into Gefitinib group (37 patients) and VMP chemotherapy group (36 patients). Patients in VMP group received VM-26 100 mg/day by intravenous injection, from day 1 to day 3, cisplatin 25 mg/m2 by intravenous injection, from day 1 to day 3. One cycle was defined as a 21-day therapy duration, with a total of 3 cycles; 2 cycles were used for consolidation. Patients in Gefitinib group received Gefitinib orally. Both groups received 3D-CRT, DT50 Gy/25f/35d from first day and target areas were treated with whole brain radiotherapy. The results of the study are listed below: There was no significant difference in the short-term effects of the two groups (P > 0.05). Median survival time (MST) of Gefitinib was 13.3 months whereas median survival time of VMP group is 12.7 months (P < 0.05). In Gefitinib group, we did not observe any difference of the median survival time between the patients with and without mutation EGFR. Toxicity of Gefitinib groups were characterized by rash, whereas chemotherapy resulted in hematologic toxicities, which included 6 cases of III/IV leucopenia (17.6 %), 3 cases of anemia (8.8 %), and 5 cases of thrombocytopenia (14.7 %), and non-hematological toxicity which was less serious symptoms for gastrointestinal disorders, hair loss, etc. These adverse reactions can be released after symptomatic treatment. No treatment-related deaths occurred. Two patients in VMP group quit due to IV leucopenia. Both oral Gefitinib and systemic VMP chemotherapy in combination with three-dimensional conformal radiotherapy (3D-CRT) could be used to treat brain metastases from non-small cell lung cancer. There were no difference in the short-term effects of the two groups, but long-term effect of Gefitinib group was slightly better than VMP group. Moreover, Gefitinib group showed low toxicity. All together, our finding implicated that Gefitinib is an effective method for patients with brain metastases from NSCLC.

Several of the thousands of long noncoding RNAs (lncRNAs) have been functionally characterized in various tumors. In this study, we aimed to explore the function and possible molecular mechanism of lncRNA KTN1 antisense RNA 1 (KTN1-AS1) involved in non-small cell lung cancer (NSCLC). We identified a novel NSCLC-related lncRNA, KTN1 antisense RNA 1 (KTN1-AS1) which was demonstrated to be distinctly highly expressed in NSCLC. KTN1-AS1 upregulation was induced by STAT1. Clinical study also suggested that higher levels of KTN1-AS1 were associated with advanced clinical progression and a shorter five-year overall survival. Functionally, lossof-function assays with in vitro and in vivo experiments revealed that KTN1-AS1 promoted the proliferation, migration, invasion and EMT progress of NSCLC cells, and suppressed apoptosis. Mechanistic studies indicated that miR-23b was a direct target of KTN1-AS1, which functioned as a ceRNA to subsequently facilitate miR-23b's target gene DEPDC1 expression in NSCLC cells. Rescue experiments confirmed that KTN1-AS1 overexpression could increase the colony formation and migration ability suppressed by miR-23b upregulation in NSCLC cells. Overall, our findings imply that STAT1-induced upregulation of KTN1-AS1 display tumor-promotive roles in NSCLC progression via regulating miR-23b/DEPDC1 axis, suggesting that KTN1-AS1 may be a novel biomarker and therapeutic target for NSCLC patients.

Tumor APJ can be used to predict the therapy response and prognosis in GC patients receiving CRT+endostar therapy.