Abstract：
:Signaling pathways that activate mTOR (mammalian target of rapamycin) are altered in many human cancers and these alterations are associated with prognosis and treatment response. mTOR inhibition can restore sensitivity to DNA damaging agents such as cisplatin. The rapamycin derivative everolimus exhibits antitumor activity and is approved for patients with renal cell cancer. Clinically, everolimus has also been evaluated in patients with advanced non-small cell lung cancer (NSCLC) that were refractory to chemotherapy and epidermal growth factor receptor tyrosine kinase inhibitors. We tested the effects of combined treatment with everolimus (RAD001) and fractionated radiation using a xenograft model of human NSCLC (A549 cells). In growth studies, mean tumor volume was reduced in the everolimus plus 30 Gy cohort with significant tumor growth suppression compared to 30 Gy alone (p=0015), or everolimus alone (p<0.001, ANOVA). everolimus (20 nM) significantly reduced protein levels of the mTOR downstream effector p70-S6K compared with radiation and vehicle (p=0.05, ANOVA) and significantly suppressed phospho-p70-S6K levels compared with all other treatments (p<0.001, ANOVA). We also evaluated everolimus and radiation effects on gene expression in A549 cells. Everolimus ± 5 Gy suppressed endothelin 1 and lactate dehydrogenase expression and increased VEGFA, p21, hypoxia-inducible factor-1α and SLC2A1 (facilitated glucose transporter 1). mTOR mRNA levels were unaffected while TNF-α levels were increased with everolimus + 5 Gy compared to either treatment alone. These findings suggest that everolimus increases the antitumor activity of radiation. Clinical trials combining everolimus with fractionated radiation in patients with NSCLC are warranted.
journal_name
Oncol Repjournal_title
Oncology reportsauthors
Mauceri HJ,Sutton HG,Darga TE,Kocherginsky M,Kochanski J,Weichselbaum RR,Vokes EEdoi
10.3892/or.2012.1666subject
Has Abstractpub_date
2012-05-01 00:00:00pages
1625-9issue
5eissn
1021-335Xissn
1791-2431journal_volume
27pub_type
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